2022 NEW YORK CITY FUEL GAS CODE 2 - 1 ‡‡‡ Chapter 2 was amended by Local Law 77 of 2023 . This law has an effective date of June 10, 2023. CHAPTER 2 DEFINITIONS SECTION FGC 201 GENERAL 201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code and standard, have the meanings indicated in this chapter. 201.2 Inter changeability. Words used in the present tense include the future; words in the masculine gender in- clude the feminine and neuter; the singular number includes the plural and the plural, the singular. 201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the New York City Electrical Code , New York City Building Code , New York City Fire Code , New York City Mechanical Code , New York City Plumbing Code , or the New York City Energy Conservation Code , such terms shall have meanings ascribed to them as in those codes. ‡‡‡ 201.3.1 Terms defined in the general administrative provisions. The following terms are defined in Sec- tion 28 - 101.5 of the Administrative Code : 1968 BUILDING CODE. 1968 OR PRIOR CODE BUILDINGS OR STRUCTURES (PRIOR CODE BUILDINGS). ACCEPTANCE OR ACCEPTED. ADDITION. ADMINISTRATIVE CODE. ALTERATION. APPROVAL OR APPROVED. APPROVED AGENCY. APPROVED FABRICATOR. APPROVED INSPECTION AGENCY. APPROVED TESTING AGENCY. ARCHITECT. BUILDING. CERTIFICATE OF COMPLIANCE. CHARTER. CITY. COMMISSIONER. CONSTRUCTION DOCUMENTS. DAY. DEFERRED SUBMITTAL. DEMOLITION. DEMOLITION, FULL. DEFINITIONS 2 - 2 2022 NEW YORK CITY FUEL GAS CODE DEMOLITION, PARTIAL. DEPARTMENT. ENGINEER. ENLARGEMENT. ENVIRONMENTAL CONTROL BOARD or ECB. EXISTING BUILDING OR STRUCTUR E. FABRICATED ITEM. FIRE PROTECTION PLAN. HEREAFTER. HERETOFORE. INSPECTION CERTIFICATE. INTERIM CERTIFICATE OF OCCUPANCY. LABEL. LABELED. LAND SURVEYOR. LANDSCAPE ARCHITECT. LETTER OF COMPLETION. LIMITED ALTERATION APPLICATION. LIMITED PLUMBING ALTERATIONS. LIMITED SPRINKLER ALTERATIONS. LIMITED STANDPIPE ALTERATIONS. LISTED. MAIN USE OR DOMINANT OCCUPANCY (OF A BUILDING). MANUFACTURER’S DESIGNATION. MARK. MATERIALS. OCCUPANCY. OWNER. PARTY WALL. PERMIT. PERSON. PREMISES. PRIOR CODE BUILDING. PROFESSIONAL CERTIFICATION. PROGRESS INSPECTION. PROJECT. REGISTERED DESIGN PROFESSIONAL. REGISTERED DESIGN PROFESSIONAL OF RECORD. REQUIRED. RETAINING WALL. SERVICE EQUIPMENT. SIGN - OFF. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 3 SINGLE ROOM OCCUPANCY MULTIPLE DWELLING. SPECIAL INSPECTION . SPECIAL INSPECTION AGENCY. SPECIAL INSPECTOR. STRUCTURE. SUBMITTAL DOCUMENTS. SUPERINTENDENT OF CONSTRUCTION (CONSTRUCTION SUPERINTENDENT). USE (USED). UTILITY COMPANY OR PUBLIC UTILITY COMPANY. UTILITY CORPORATION OR PUBLIC UTILITY CORPORATION. WORK NOT CONSTITUTING MINOR ALTERATIONS OR ORDINARY REPAIRS. WRITING (WRITTEN). WRITTEN NOTICE. ZONING RESOLUTION. 201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have ordin arily accepted meanings such as the context implies. ‡‡‡ SECTION FGC 202 GENERAL DEFINITIONS ABNORMAL OPERATING CONDITION. A condition that may indicate a malfunction or a noncompliant com- ponent of a piping system or appliance. ACCESS (TO). That which enables a device, fixture, appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel, door or similar obstruction (see also “Ready access (to) ”). AIR CONDITIONER, GAS - FIRED. A gas - b urning, automatically operated appliance for supplying cooled or dehumidified air or chilled liquid. AIR CONDITIONING. The treatment of air so as to control simultaneously the temperature, humidity, cleanness and distribution of the air to meet the require ments of a conditioned space. AIR, EXHAUST. See “Exhaust.” AIR - HANDLING UNIT. A blower or fan used for the purpose of distributing supply air to a room, space or area. AIR, MAKEUP. Any combination of outdoor and transfer air intended to replace exhaust air and exfiltration. APPLIANCE. Any apparatus or device that utilizes a fuel or raw material to produce light, heat, power, refrigeration or air conditioning. APPLIANCE, AUTOMATICALLY CONTROLLED. Appliances equipped with an automatic b urner ignition and safety shutoff device and other automatic devices which accomplish complete turn - on and shutoff of the gas to the main burner or burners, and graduate the gas supply to the burner or burners, but do not affect complete shutoff of the gas . APPLIANCE TYPE. Low - heat appliance (residential appliance). Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of 1,000 ° F (538 ° C) or less. Medium - heat appliance. Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of more than 1,000 ° F (538 ° C ) or less but not greater than 2,000 ° F ( 1093 .3° C). DEFINITIONS 2 - 4 2022 NEW YORK CITY FUEL GAS CODE APPLIANCE, UNVENTED. An appliance designed or installed in such a manner that the products of combustion are not conveyed by a vent or chimney directly to the outdoor atmosphere. APPLIANCE, VENTED. An appliance designed and installed in such a manner that all of the products o f com- bustion are conveyed directly from the appliance to the outdoor atmosphere through an approved chimney or vent system. See also “VENTED APPLIANCE CATEGORIES.” ATMOSPHERIC PRESSURE. The pressure of the weight of air and water vapor on the surface of th e earth, ap- proximately 14.7 pounds per square inch (psi) (101 kPa absolute) at sea level. BAFFLE. An object placed in an appliance to change the direction of or retard the flow of air, air - gas mixtures or flue gases. BAROMETRIC DRAFT REGULATOR. A balanced damper device attached to a chimney, vent connector, breeching or flue gas manifold to protect combustion appliances by controlling chimney draft. A double - acting barometric draft regulator is one in which the balancing damper is free to move in either direction to protect combustion appliances from both excessive draft and backdraft. BOILER, HIGH - PRESSURE. An appliance for supplying steam or hot water that, for a steam boiler, operates at a pressure of more than 15 psig ( 103.4 kPa gauge), and for a hot water boiler, operates at a pressure exceeding 160 psig ( 1103 kPa gauge) or at a temperature exceeding 250° F ( 121.1 °C). BOILER, LOW - PRESSURE. A self - contained appliance for supplying steam or hot water as follows: Hot water heating boiler. A boiler in which no steam is generated, from which hot water is circulated for heating purposes and then returned to the boiler, and that operates at water pressures not exceeding 160 pounds per square inch gauge (psig) ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Hot water supply boiler. A boiler, completely fill ed with water, which furnishes hot water to be used externally to itself, and that operates at water pressures not exceeding 160 psig ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Steam heating boile r. A boiler in which steam is generated and that operates at a steam pressure not exceeding 15 psig ( 103.4 kPa gauge). BRANCH. A section of gas piping downstream from a riser, leading to appliances or equipment on no more than two consecutive floors. BRAZING. A metal - joining process wherein coalescence is produced by the use of a nonferrous filler metal having a melting point above 1,000°F ( 537.8 ° C), but lower than that of the base metal being joined. The filler material is distributed between the clos ely fitted surfaces of the joint by capillary action. BROILER. A general term including salamanders, barbecues and other appliances cooking primarily by radiated heat, excepting toasters. BTU. Abbreviation for British thermal unit, which is the quantity of heat required to raise the temperature of 1 pound (454 g) of water 1°F ( - 17.2 ° C) (1 Btu = 1055 J). BURNER. A device for the final conveyance of the gas, or a mixture of gas and air, to the combustion zone. Induced draft. A burner that depends on draft induced by a fan that is an integral part of the appliance and is located downstream from the burner. Power. A burner in which gas, air or both are supplied at pressures exceeding, for gas, the line pressure, and for air, atmospheric pressure, with t his added pressure being applied at the burner. CHIMNEY. A primarily vertical structure containing one or more flues used to remove hot gases from burning fuel, refuse, or industrial processes from a fuel - burning appliance to the outdoor atmosphere. Factor y - built chimney. A listed and labeled chimney composed of factory - made components, assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. 2022 NEW YORK CITY FUEL GAS CODE 2 - 1 ‡‡‡ Chapter 2 was amended by Local Law 77 of 2023 . This law has an effective date of June 10, 2023. CHAPTER 2 DEFINITIONS SECTION FGC 201 GENERAL 201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code and standard, have the meanings indicated in this chapter. 201.2 Inter changeability. Words used in the present tense include the future; words in the masculine gender in- clude the feminine and neuter; the singular number includes the plural and the plural, the singular. 201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the New York City Electrical Code , New York City Building Code , New York City Fire Code , New York City Mechanical Code , New York City Plumbing Code , or the New York City Energy Conservation Code , such terms shall have meanings ascribed to them as in those codes. ‡‡‡ 201.3.1 Terms defined in the general administrative provisions. The following terms are defined in Sec- tion 28 - 101.5 of the Administrative Code : 1968 BUILDING CODE. 1968 OR PRIOR CODE BUILDINGS OR STRUCTURES (PRIOR CODE BUILDINGS). ACCEPTANCE OR ACCEPTED. ADDITION. ADMINISTRATIVE CODE. ALTERATION. APPROVAL OR APPROVED. APPROVED AGENCY. APPROVED FABRICATOR. APPROVED INSPECTION AGENCY. APPROVED TESTING AGENCY. ARCHITECT. BUILDING. CERTIFICATE OF COMPLIANCE. CHARTER. CITY. COMMISSIONER. CONSTRUCTION DOCUMENTS. DAY. DEFERRED SUBMITTAL. DEMOLITION. DEMOLITION, FULL. DEFINITIONS 2 - 2 2022 NEW YORK CITY FUEL GAS CODE DEMOLITION, PARTIAL. DEPARTMENT. ENGINEER. ENLARGEMENT. ENVIRONMENTAL CONTROL BOARD or ECB. EXISTING BUILDING OR STRUCTUR E. FABRICATED ITEM. FIRE PROTECTION PLAN. HEREAFTER. HERETOFORE. INSPECTION CERTIFICATE. INTERIM CERTIFICATE OF OCCUPANCY. LABEL. LABELED. LAND SURVEYOR. LANDSCAPE ARCHITECT. LETTER OF COMPLETION. LIMITED ALTERATION APPLICATION. LIMITED PLUMBING ALTERATIONS. LIMITED SPRINKLER ALTERATIONS. LIMITED STANDPIPE ALTERATIONS. LISTED. MAIN USE OR DOMINANT OCCUPANCY (OF A BUILDING). MANUFACTURER’S DESIGNATION. MARK. MATERIALS. OCCUPANCY. OWNER. PARTY WALL. PERMIT. PERSON. PREMISES. PRIOR CODE BUILDING. PROFESSIONAL CERTIFICATION. PROGRESS INSPECTION. PROJECT. REGISTERED DESIGN PROFESSIONAL. REGISTERED DESIGN PROFESSIONAL OF RECORD. REQUIRED. RETAINING WALL. SERVICE EQUIPMENT. SIGN - OFF. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 3 SINGLE ROOM OCCUPANCY MULTIPLE DWELLING. SPECIAL INSPECTION . SPECIAL INSPECTION AGENCY. SPECIAL INSPECTOR. STRUCTURE. SUBMITTAL DOCUMENTS. SUPERINTENDENT OF CONSTRUCTION (CONSTRUCTION SUPERINTENDENT). USE (USED). UTILITY COMPANY OR PUBLIC UTILITY COMPANY. UTILITY CORPORATION OR PUBLIC UTILITY CORPORATION. WORK NOT CONSTITUTING MINOR ALTERATIONS OR ORDINARY REPAIRS. WRITING (WRITTEN). WRITTEN NOTICE. ZONING RESOLUTION. 201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have ordin arily accepted meanings such as the context implies. ‡‡‡ SECTION FGC 202 GENERAL DEFINITIONS ABNORMAL OPERATING CONDITION. A condition that may indicate a malfunction or a noncompliant com- ponent of a piping system or appliance. ACCESS (TO). That which enables a device, fixture, appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel, door or similar obstruction (see also “Ready access (to) ”). AIR CONDITIONER, GAS - FIRED. A gas - b urning, automatically operated appliance for supplying cooled or dehumidified air or chilled liquid. AIR CONDITIONING. The treatment of air so as to control simultaneously the temperature, humidity, cleanness and distribution of the air to meet the require ments of a conditioned space. AIR, EXHAUST. See “Exhaust.” AIR - HANDLING UNIT. A blower or fan used for the purpose of distributing supply air to a room, space or area. AIR, MAKEUP. Any combination of outdoor and transfer air intended to replace exhaust air and exfiltration. APPLIANCE. Any apparatus or device that utilizes a fuel or raw material to produce light, heat, power, refrigeration or air conditioning. APPLIANCE, AUTOMATICALLY CONTROLLED. Appliances equipped with an automatic b urner ignition and safety shutoff device and other automatic devices which accomplish complete turn - on and shutoff of the gas to the main burner or burners, and graduate the gas supply to the burner or burners, but do not affect complete shutoff of the gas . APPLIANCE TYPE. Low - heat appliance (residential appliance). Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of 1,000 ° F (538 ° C) or less. Medium - heat appliance. Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of more than 1,000 ° F (538 ° C ) or less but not greater than 2,000 ° F ( 1093 .3° C). DEFINITIONS 2 - 4 2022 NEW YORK CITY FUEL GAS CODE APPLIANCE, UNVENTED. An appliance designed or installed in such a manner that the products of combustion are not conveyed by a vent or chimney directly to the outdoor atmosphere. APPLIANCE, VENTED. An appliance designed and installed in such a manner that all of the products o f com- bustion are conveyed directly from the appliance to the outdoor atmosphere through an approved chimney or vent system. See also “VENTED APPLIANCE CATEGORIES.” ATMOSPHERIC PRESSURE. The pressure of the weight of air and water vapor on the surface of th e earth, ap- proximately 14.7 pounds per square inch (psi) (101 kPa absolute) at sea level. BAFFLE. An object placed in an appliance to change the direction of or retard the flow of air, air - gas mixtures or flue gases. BAROMETRIC DRAFT REGULATOR. A balanced damper device attached to a chimney, vent connector, breeching or flue gas manifold to protect combustion appliances by controlling chimney draft. A double - acting barometric draft regulator is one in which the balancing damper is free to move in either direction to protect combustion appliances from both excessive draft and backdraft. BOILER, HIGH - PRESSURE. An appliance for supplying steam or hot water that, for a steam boiler, operates at a pressure of more than 15 psig ( 103.4 kPa gauge), and for a hot water boiler, operates at a pressure exceeding 160 psig ( 1103 kPa gauge) or at a temperature exceeding 250° F ( 121.1 °C). BOILER, LOW - PRESSURE. A self - contained appliance for supplying steam or hot water as follows: Hot water heating boiler. A boiler in which no steam is generated, from which hot water is circulated for heating purposes and then returned to the boiler, and that operates at water pressures not exceeding 160 pounds per square inch gauge (psig) ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Hot water supply boiler. A boiler, completely fill ed with water, which furnishes hot water to be used externally to itself, and that operates at water pressures not exceeding 160 psig ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Steam heating boile r. A boiler in which steam is generated and that operates at a steam pressure not exceeding 15 psig ( 103.4 kPa gauge). BRANCH. A section of gas piping downstream from a riser, leading to appliances or equipment on no more than two consecutive floors. BRAZING. A metal - joining process wherein coalescence is produced by the use of a nonferrous filler metal having a melting point above 1,000°F ( 537.8 ° C), but lower than that of the base metal being joined. The filler material is distributed between the clos ely fitted surfaces of the joint by capillary action. BROILER. A general term including salamanders, barbecues and other appliances cooking primarily by radiated heat, excepting toasters. BTU. Abbreviation for British thermal unit, which is the quantity of heat required to raise the temperature of 1 pound (454 g) of water 1°F ( - 17.2 ° C) (1 Btu = 1055 J). BURNER. A device for the final conveyance of the gas, or a mixture of gas and air, to the combustion zone. Induced draft. A burner that depends on draft induced by a fan that is an integral part of the appliance and is located downstream from the burner. Power. A burner in which gas, air or both are supplied at pressures exceeding, for gas, the line pressure, and for air, atmospheric pressure, with t his added pressure being applied at the burner. CHIMNEY. A primarily vertical structure containing one or more flues used to remove hot gases from burning fuel, refuse, or industrial processes from a fuel - burning appliance to the outdoor atmosphere. Factor y - built chimney. A listed and labeled chimney composed of factory - made components, assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. 2022 NEW YORK CITY FUEL GAS CODE 2 - 1 ‡‡‡ Chapter 2 was amended by Local Law 77 of 2023 . This law has an effective date of June 10, 2023. CHAPTER 2 DEFINITIONS SECTION FGC 201 GENERAL 201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code and standard, have the meanings indicated in this chapter. 201.2 Inter changeability. Words used in the present tense include the future; words in the masculine gender in- clude the feminine and neuter; the singular number includes the plural and the plural, the singular. 201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the New York City Electrical Code , New York City Building Code , New York City Fire Code , New York City Mechanical Code , New York City Plumbing Code , or the New York City Energy Conservation Code , such terms shall have meanings ascribed to them as in those codes. ‡‡‡ 201.3.1 Terms defined in the general administrative provisions. The following terms are defined in Sec- tion 28 - 101.5 of the Administrative Code : 1968 BUILDING CODE. 1968 OR PRIOR CODE BUILDINGS OR STRUCTURES (PRIOR CODE BUILDINGS). ACCEPTANCE OR ACCEPTED. ADDITION. ADMINISTRATIVE CODE. ALTERATION. APPROVAL OR APPROVED. APPROVED AGENCY. APPROVED FABRICATOR. APPROVED INSPECTION AGENCY. APPROVED TESTING AGENCY. ARCHITECT. BUILDING. CERTIFICATE OF COMPLIANCE. CHARTER. CITY. COMMISSIONER. CONSTRUCTION DOCUMENTS. DAY. DEFERRED SUBMITTAL. DEMOLITION. DEMOLITION, FULL. DEFINITIONS 2 - 2 2022 NEW YORK CITY FUEL GAS CODE DEMOLITION, PARTIAL. DEPARTMENT. ENGINEER. ENLARGEMENT. ENVIRONMENTAL CONTROL BOARD or ECB. EXISTING BUILDING OR STRUCTUR E. FABRICATED ITEM. FIRE PROTECTION PLAN. HEREAFTER. HERETOFORE. INSPECTION CERTIFICATE. INTERIM CERTIFICATE OF OCCUPANCY. LABEL. LABELED. LAND SURVEYOR. LANDSCAPE ARCHITECT. LETTER OF COMPLETION. LIMITED ALTERATION APPLICATION. LIMITED PLUMBING ALTERATIONS. LIMITED SPRINKLER ALTERATIONS. LIMITED STANDPIPE ALTERATIONS. LISTED. MAIN USE OR DOMINANT OCCUPANCY (OF A BUILDING). MANUFACTURER’S DESIGNATION. MARK. MATERIALS. OCCUPANCY. OWNER. PARTY WALL. PERMIT. PERSON. PREMISES. PRIOR CODE BUILDING. PROFESSIONAL CERTIFICATION. PROGRESS INSPECTION. PROJECT. REGISTERED DESIGN PROFESSIONAL. REGISTERED DESIGN PROFESSIONAL OF RECORD. REQUIRED. RETAINING WALL. SERVICE EQUIPMENT. SIGN - OFF. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 3 SINGLE ROOM OCCUPANCY MULTIPLE DWELLING. SPECIAL INSPECTION . SPECIAL INSPECTION AGENCY. SPECIAL INSPECTOR. STRUCTURE. SUBMITTAL DOCUMENTS. SUPERINTENDENT OF CONSTRUCTION (CONSTRUCTION SUPERINTENDENT). USE (USED). UTILITY COMPANY OR PUBLIC UTILITY COMPANY. UTILITY CORPORATION OR PUBLIC UTILITY CORPORATION. WORK NOT CONSTITUTING MINOR ALTERATIONS OR ORDINARY REPAIRS. WRITING (WRITTEN). WRITTEN NOTICE. ZONING RESOLUTION. 201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have ordin arily accepted meanings such as the context implies. ‡‡‡ SECTION FGC 202 GENERAL DEFINITIONS ABNORMAL OPERATING CONDITION. A condition that may indicate a malfunction or a noncompliant com- ponent of a piping system or appliance. ACCESS (TO). That which enables a device, fixture, appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel, door or similar obstruction (see also “Ready access (to) ”). AIR CONDITIONER, GAS - FIRED. A gas - b urning, automatically operated appliance for supplying cooled or dehumidified air or chilled liquid. AIR CONDITIONING. The treatment of air so as to control simultaneously the temperature, humidity, cleanness and distribution of the air to meet the require ments of a conditioned space. AIR, EXHAUST. See “Exhaust.” AIR - HANDLING UNIT. A blower or fan used for the purpose of distributing supply air to a room, space or area. AIR, MAKEUP. Any combination of outdoor and transfer air intended to replace exhaust air and exfiltration. APPLIANCE. Any apparatus or device that utilizes a fuel or raw material to produce light, heat, power, refrigeration or air conditioning. APPLIANCE, AUTOMATICALLY CONTROLLED. Appliances equipped with an automatic b urner ignition and safety shutoff device and other automatic devices which accomplish complete turn - on and shutoff of the gas to the main burner or burners, and graduate the gas supply to the burner or burners, but do not affect complete shutoff of the gas . APPLIANCE TYPE. Low - heat appliance (residential appliance). Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of 1,000 ° F (538 ° C) or less. Medium - heat appliance. Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of more than 1,000 ° F (538 ° C ) or less but not greater than 2,000 ° F ( 1093 .3° C). DEFINITIONS 2 - 4 2022 NEW YORK CITY FUEL GAS CODE APPLIANCE, UNVENTED. An appliance designed or installed in such a manner that the products of combustion are not conveyed by a vent or chimney directly to the outdoor atmosphere. APPLIANCE, VENTED. An appliance designed and installed in such a manner that all of the products o f com- bustion are conveyed directly from the appliance to the outdoor atmosphere through an approved chimney or vent system. See also “VENTED APPLIANCE CATEGORIES.” ATMOSPHERIC PRESSURE. The pressure of the weight of air and water vapor on the surface of th e earth, ap- proximately 14.7 pounds per square inch (psi) (101 kPa absolute) at sea level. BAFFLE. An object placed in an appliance to change the direction of or retard the flow of air, air - gas mixtures or flue gases. BAROMETRIC DRAFT REGULATOR. A balanced damper device attached to a chimney, vent connector, breeching or flue gas manifold to protect combustion appliances by controlling chimney draft. A double - acting barometric draft regulator is one in which the balancing damper is free to move in either direction to protect combustion appliances from both excessive draft and backdraft. BOILER, HIGH - PRESSURE. An appliance for supplying steam or hot water that, for a steam boiler, operates at a pressure of more than 15 psig ( 103.4 kPa gauge), and for a hot water boiler, operates at a pressure exceeding 160 psig ( 1103 kPa gauge) or at a temperature exceeding 250° F ( 121.1 °C). BOILER, LOW - PRESSURE. A self - contained appliance for supplying steam or hot water as follows: Hot water heating boiler. A boiler in which no steam is generated, from which hot water is circulated for heating purposes and then returned to the boiler, and that operates at water pressures not exceeding 160 pounds per square inch gauge (psig) ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Hot water supply boiler. A boiler, completely fill ed with water, which furnishes hot water to be used externally to itself, and that operates at water pressures not exceeding 160 psig ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Steam heating boile r. A boiler in which steam is generated and that operates at a steam pressure not exceeding 15 psig ( 103.4 kPa gauge). BRANCH. A section of gas piping downstream from a riser, leading to appliances or equipment on no more than two consecutive floors. BRAZING. A metal - joining process wherein coalescence is produced by the use of a nonferrous filler metal having a melting point above 1,000°F ( 537.8 ° C), but lower than that of the base metal being joined. The filler material is distributed between the clos ely fitted surfaces of the joint by capillary action. BROILER. A general term including salamanders, barbecues and other appliances cooking primarily by radiated heat, excepting toasters. BTU. Abbreviation for British thermal unit, which is the quantity of heat required to raise the temperature of 1 pound (454 g) of water 1°F ( - 17.2 ° C) (1 Btu = 1055 J). BURNER. A device for the final conveyance of the gas, or a mixture of gas and air, to the combustion zone. Induced draft. A burner that depends on draft induced by a fan that is an integral part of the appliance and is located downstream from the burner. Power. A burner in which gas, air or both are supplied at pressures exceeding, for gas, the line pressure, and for air, atmospheric pressure, with t his added pressure being applied at the burner. CHIMNEY. A primarily vertical structure containing one or more flues used to remove hot gases from burning fuel, refuse, or industrial processes from a fuel - burning appliance to the outdoor atmosphere. Factor y - built chimney. A listed and labeled chimney composed of factory - made components, assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 5 Masonry chimney. A field - constructed chimney composed of solid mason ry units, bricks, stones or concrete. Metal chimney. A field - constructed chimney composed of metal. CLEARANCE. The minimum distance through air measured between the heat - producing surface of the mechanical appliance, device or equipment and the surface of the combustible material or assembly. CLOTHES DRYER. An appliance used to dry wet laundry by means of heated air. Dryer classifications are as follows: Type 1. Factory - built package, multiple production. Primarily used in family living environment. Usually the smallest unit physically and in function output. Type 2. Factory - built package, multiple production. Used in business with direct intercourse of the functi on with the public. Not designed for use in individual family living environment. COMBUSTIBLE ASSEMBLY. Wall, floor, ceiling or other assembly constructed of one or more component mate- rials that are not defined as noncombustible. COMBUSTIBLE MATERIAL. Any material not defined as noncombustible. COMBUSTION. In the context of this code, refers to the rapid oxidation of fuel accompanied by the production of heat or heat and light. COMBUSTION AIR . Air necessary for complete combustion of a fuel, including theor etical air and excess air. COMBUSTION CHAMBER. The portion of an appliance within which combustion occurs. COMBUSTION PRODUCTS. Constituents resulting from the combustion of a fuel with the oxygen of the air, including inert gases, but excluding excess air. CONCEALED LOCATION. A location that cannot be accessed without damaging permanent parts of the building structure or finished surface. Spaces above, below or behind readily removable panels or doors shall not be considered as concealed. CONCEAL ED PIPING. Piping that is located in a concealed location (see “Concealed location ”). CONDENSATE. The liquid that condenses from a gas (including flue gas) caused by a reduction in temperature or increase in pressure. CONNECTOR, APPLIANCE (Fuel). Rigid metallic pipe and fittings or a listed and labeled device that connects an appliance to the gas piping system. CONNECTOR, CHIMNEY OR VENT. The pipe that connects an appliance to a chimney or vent. CONTROL. A manual or automatic device designed to re gulate the gas, air, water or electrical supply to, or operation of, a mechanical system. CONVERSION BURNER. A unit consisting of a burner and its controls for installation in an appliance originally uti- lizing another fuel. COUNTER APPLIANCES. Appliances s uch as coffee brewers and coffee urns and any appurtenant water - heating ap- pliance, food and dish warmers, hot plates, griddles, waffle bakers and other appliances designed for installation on or in a counter. CUBIC FOOT. The amount of gas that occupies 1 c ubic foot (0.02832 m 3 ) when at a temperature of 60°F ( 15.6 ° C), saturated with water vapor and under a pressure equivalent to that of 30 inches of mercury (101 kPa). DAMPER. A manually or automatically controlled device to regulate draft or the rate of flow of air or combustion gases. DECORATIVE APPLIANCE, VENTED. A vented appliance wherein the primary function lies in the aesthetic effect of the flames. DEFINITIONS 2 - 6 2022 NEW YORK CITY FUEL GAS CODE DECORATIVE APPLIANCES FOR INSTALLATION IN VENTED FIREPLACES. A vented appliance de- signed for installa tion within the fire chamber of a vented fireplace, wherein the primary function lies in the aesthetic effect of the flames. DECORATIVE SHROUD. A listed, partial, noncombustible enclosure for aesthetic purposes that is installed at the termination of a ven ting system that surrounds or conceals a factory - built chimney system or vent cap. DEMAND. The maximum amount of gas input required per unit of time, usually expressed in cubic feet per hour (1 ft 3 = 0.0283 m 3 ), or Btu/h (1 Btu/h = 0.2931 W). DILUTION AIR. Air that is introduced into a draft hood and is mixed with the flue gases. DIRECT - VENT APPLIANCES. Appliances that are constructed and installed so that all air for combustion is derived directly from the outdo or atmosphere and all flue gases are discharged directly to the outdoor atmosphere. DRAFT. The pressure difference existing between the appliance or any component part and the atmosphere, that causes a continuous flow of air and products of combustion thro ugh the gas passages of the appliance to the atmos- phere. Induced draft. The pressure difference created by the action of a fan, blower or ejector, that is located between the appliance and the chimney or vent termination. Natural draft. The pressure difference created by a vent or chimney because of its height, and the temperature difference between the flue gases and the atmosphere. DRAFT HOOD. A nonadjustable device built into an appliance, or made as part of the vent connector from an appl iance, that is designed to (1) provide for ready escape of the flue gases from the appliance in the event of no draft, backdraft or stoppage beyond the draft hood, (2) prevent a backdraft from entering the appliance, and (3) neutralize the effect of stack action of the chimney or gas vent upon operation of the appliance. DRAFT REGULATOR. A device that functions to maintain a desired draft in the appliance by automatically reducing the draft to the desired value. DRIP. A nipple and cap placed at a low point in a system of piping to collect condensate and from which the conden- sate is removable. DRY GAS. A gas having a moisture and hydrocarbon dew point below any normal temperature to which the gas piping is exposed. DUCT FURNACE. A warm - air furnace or heater n ormally installed in an air distribution duct to supply warm air for heating. This definition shall apply only to a warm - air heating appliance that, for air circulation, depends on a blower not furnished as part of the furnace. DUCT SYSTEM. A continuous pa ssageway for the transmission of air that, in addition to ducts, includes duct fittings, dampers, plenums, fans and accessory air - handling equipment and appliances . DWELLING. A building or structure which is occupied in whole or in part as the home, residence or sleeping place of one or more families. DWELLING UNIT. A single unit consisting of one or more habitable rooms and occupied or arranged to be occupied as a unit separa te from all other units within a dwelling. EQUIPMENT. Any apparatus or device that delivers gas as a fuel or raw material to an appliance or vents combustion products from an appliance, including but not limited to control devices, pressure regulators, val ves, appliance appurtenances, gas connectors, or power exhausters used in connections to appliances. EXCESS FLOW VALVE (EFV). A safety shut - off valve designed to activate to interrupt the flow of gas when the fuel gas passing through it exceeds a prescribe d flow rate. Installed where specifically required by code or utility company. EXHAUST. Air being removed from any space, appliance or piece of equipment conveyed directly to the atmosphere by means of openings or ducts. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 7 EXTERIOR MASONRY CHIMNEYS. Masonry chimneys exposed to the outdoors on one or more sides below the roof line. FIREPLACE. An assembly consisting of a hearth and fire chamber of noncombustible material and provided with a chimney , for use with solid fuels. Factory - built fireplace. A listed and labeled fireplace and chimney system composed of factory - made compo- nents , and assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. Masonry fireplace. A hearth and fire chamber of s olid masonry units such as bricks, stones, listed masonry units or reinforced concrete, provided with a suitable chimney. FLAME SAFEGUARD. A device that will automatically shut off the fuel supply to a main burner or group of burners when the means of igni tion of such burners becomes inoperative, and when flame failure occurs on the burner or group of burners. FLASHBACK ARRESTOR CHECK VALVE. A device that will prevent the backflow of one gas into the supply system of another gas and prevent the passage of flame into the gas supply system. FLOOR FURNACE. A completely self - contained furnace suspended from the floor of the space being heated, ta king air for combustion from outside such space and with means for observing flames and lighting the appliance from such space. Fan type. A floor furnace equipped with a fan that provides the primary means for circulating air. Gravity type. A floor furnace depending primarily on circulation of air by gravity. This classification shall also include floor furnaces equipped with booster - type fans that do not materially restrict free circulation of air by gravity flow when such fans are not in operation. FLUE. A passageway within a chimney or vent through which gaseous combustion products pass. FLUE, APPLIANCE. The passage(s) within an appliance through which combustion products pass from the combustion chamber of the appliance to the draft hood inlet opening on an appliance equipped with a draft hood or to the outlet of the appliance on an appliance not equipped with a draft hood. FLUE COLLAR. That portion of an appliance designed for the attachment of a draft hood, vent connector or venting system. FL UE GASES. Products of combustion plus excess air in fireplace and appliance flues or heat exchangers. FLUE LINER (LINING). A system or material used to form the inside surface of a flue in a chimney or vent, for the purpose of protecting the surrounding st ructure from the effects of combustion products and for conveying combustion products without leakage into the atmosphere. FUEL GAS. A natural gas, manufactured gas, liquefied petroleum gas or mixtures of these gases. FURNACE. A completely self - contained h eating unit that is designed to supply heated air to spaces remote from or adjacent to the appliance location. FURNACE, CENTRAL. A self - contained appliance for heating air by transfer of heat of combustion through metal to the air, and designed to supply h eated air through ducts to spaces remote from or adjacent to the appliance location. Forced - air type. A central furnace equipped with a fan or blower that provides the primary means for circulation of air. FURNACE PLENUM. An air compartment or chamber to which one or more ducts are connected and that forms part of an air distribution system. GAS CONVENIENCE OUTLET. A permanently mounted, manually operated device that provides the means for connecting an appliance to, and d isconnecting an appliance from, the supply piping. The device includes an integral, manually operated valve with a nondisplaceable valve member and is designed so that disconnection of an appliance only occurs when the manually operated valve is in the clo sed position. 2022 NEW YORK CITY FUEL GAS CODE 2 - 1 ‡‡‡ Chapter 2 was amended by Local Law 77 of 2023 . This law has an effective date of June 10, 2023. CHAPTER 2 DEFINITIONS SECTION FGC 201 GENERAL 201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code and standard, have the meanings indicated in this chapter. 201.2 Inter changeability. Words used in the present tense include the future; words in the masculine gender in- clude the feminine and neuter; the singular number includes the plural and the plural, the singular. 201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the New York City Electrical Code , New York City Building Code , New York City Fire Code , New York City Mechanical Code , New York City Plumbing Code , or the New York City Energy Conservation Code , such terms shall have meanings ascribed to them as in those codes. ‡‡‡ 201.3.1 Terms defined in the general administrative provisions. The following terms are defined in Sec- tion 28 - 101.5 of the Administrative Code : 1968 BUILDING CODE. 1968 OR PRIOR CODE BUILDINGS OR STRUCTURES (PRIOR CODE BUILDINGS). ACCEPTANCE OR ACCEPTED. ADDITION. ADMINISTRATIVE CODE. ALTERATION. APPROVAL OR APPROVED. APPROVED AGENCY. APPROVED FABRICATOR. APPROVED INSPECTION AGENCY. APPROVED TESTING AGENCY. ARCHITECT. BUILDING. CERTIFICATE OF COMPLIANCE. CHARTER. CITY. COMMISSIONER. CONSTRUCTION DOCUMENTS. DAY. DEFERRED SUBMITTAL. DEMOLITION. DEMOLITION, FULL. DEFINITIONS 2 - 2 2022 NEW YORK CITY FUEL GAS CODE DEMOLITION, PARTIAL. DEPARTMENT. ENGINEER. ENLARGEMENT. ENVIRONMENTAL CONTROL BOARD or ECB. EXISTING BUILDING OR STRUCTUR E. FABRICATED ITEM. FIRE PROTECTION PLAN. HEREAFTER. HERETOFORE. INSPECTION CERTIFICATE. INTERIM CERTIFICATE OF OCCUPANCY. LABEL. LABELED. LAND SURVEYOR. LANDSCAPE ARCHITECT. LETTER OF COMPLETION. LIMITED ALTERATION APPLICATION. LIMITED PLUMBING ALTERATIONS. LIMITED SPRINKLER ALTERATIONS. LIMITED STANDPIPE ALTERATIONS. LISTED. MAIN USE OR DOMINANT OCCUPANCY (OF A BUILDING). MANUFACTURER’S DESIGNATION. MARK. MATERIALS. OCCUPANCY. OWNER. PARTY WALL. PERMIT. PERSON. PREMISES. PRIOR CODE BUILDING. PROFESSIONAL CERTIFICATION. PROGRESS INSPECTION. PROJECT. REGISTERED DESIGN PROFESSIONAL. REGISTERED DESIGN PROFESSIONAL OF RECORD. REQUIRED. RETAINING WALL. SERVICE EQUIPMENT. SIGN - OFF. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 3 SINGLE ROOM OCCUPANCY MULTIPLE DWELLING. SPECIAL INSPECTION . SPECIAL INSPECTION AGENCY. SPECIAL INSPECTOR. STRUCTURE. SUBMITTAL DOCUMENTS. SUPERINTENDENT OF CONSTRUCTION (CONSTRUCTION SUPERINTENDENT). USE (USED). UTILITY COMPANY OR PUBLIC UTILITY COMPANY. UTILITY CORPORATION OR PUBLIC UTILITY CORPORATION. WORK NOT CONSTITUTING MINOR ALTERATIONS OR ORDINARY REPAIRS. WRITING (WRITTEN). WRITTEN NOTICE. ZONING RESOLUTION. 201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have ordin arily accepted meanings such as the context implies. ‡‡‡ SECTION FGC 202 GENERAL DEFINITIONS ABNORMAL OPERATING CONDITION. A condition that may indicate a malfunction or a noncompliant com- ponent of a piping system or appliance. ACCESS (TO). That which enables a device, fixture, appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel, door or similar obstruction (see also “Ready access (to) ”). AIR CONDITIONER, GAS - FIRED. A gas - b urning, automatically operated appliance for supplying cooled or dehumidified air or chilled liquid. AIR CONDITIONING. The treatment of air so as to control simultaneously the temperature, humidity, cleanness and distribution of the air to meet the require ments of a conditioned space. AIR, EXHAUST. See “Exhaust.” AIR - HANDLING UNIT. A blower or fan used for the purpose of distributing supply air to a room, space or area. AIR, MAKEUP. Any combination of outdoor and transfer air intended to replace exhaust air and exfiltration. APPLIANCE. Any apparatus or device that utilizes a fuel or raw material to produce light, heat, power, refrigeration or air conditioning. APPLIANCE, AUTOMATICALLY CONTROLLED. Appliances equipped with an automatic b urner ignition and safety shutoff device and other automatic devices which accomplish complete turn - on and shutoff of the gas to the main burner or burners, and graduate the gas supply to the burner or burners, but do not affect complete shutoff of the gas . APPLIANCE TYPE. Low - heat appliance (residential appliance). Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of 1,000 ° F (538 ° C) or less. Medium - heat appliance. Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of more than 1,000 ° F (538 ° C ) or less but not greater than 2,000 ° F ( 1093 .3° C). DEFINITIONS 2 - 4 2022 NEW YORK CITY FUEL GAS CODE APPLIANCE, UNVENTED. An appliance designed or installed in such a manner that the products of combustion are not conveyed by a vent or chimney directly to the outdoor atmosphere. APPLIANCE, VENTED. An appliance designed and installed in such a manner that all of the products o f com- bustion are conveyed directly from the appliance to the outdoor atmosphere through an approved chimney or vent system. See also “VENTED APPLIANCE CATEGORIES.” ATMOSPHERIC PRESSURE. The pressure of the weight of air and water vapor on the surface of th e earth, ap- proximately 14.7 pounds per square inch (psi) (101 kPa absolute) at sea level. BAFFLE. An object placed in an appliance to change the direction of or retard the flow of air, air - gas mixtures or flue gases. BAROMETRIC DRAFT REGULATOR. A balanced damper device attached to a chimney, vent connector, breeching or flue gas manifold to protect combustion appliances by controlling chimney draft. A double - acting barometric draft regulator is one in which the balancing damper is free to move in either direction to protect combustion appliances from both excessive draft and backdraft. BOILER, HIGH - PRESSURE. An appliance for supplying steam or hot water that, for a steam boiler, operates at a pressure of more than 15 psig ( 103.4 kPa gauge), and for a hot water boiler, operates at a pressure exceeding 160 psig ( 1103 kPa gauge) or at a temperature exceeding 250° F ( 121.1 °C). BOILER, LOW - PRESSURE. A self - contained appliance for supplying steam or hot water as follows: Hot water heating boiler. A boiler in which no steam is generated, from which hot water is circulated for heating purposes and then returned to the boiler, and that operates at water pressures not exceeding 160 pounds per square inch gauge (psig) ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Hot water supply boiler. A boiler, completely fill ed with water, which furnishes hot water to be used externally to itself, and that operates at water pressures not exceeding 160 psig ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Steam heating boile r. A boiler in which steam is generated and that operates at a steam pressure not exceeding 15 psig ( 103.4 kPa gauge). BRANCH. A section of gas piping downstream from a riser, leading to appliances or equipment on no more than two consecutive floors. BRAZING. A metal - joining process wherein coalescence is produced by the use of a nonferrous filler metal having a melting point above 1,000°F ( 537.8 ° C), but lower than that of the base metal being joined. The filler material is distributed between the clos ely fitted surfaces of the joint by capillary action. BROILER. A general term including salamanders, barbecues and other appliances cooking primarily by radiated heat, excepting toasters. BTU. Abbreviation for British thermal unit, which is the quantity of heat required to raise the temperature of 1 pound (454 g) of water 1°F ( - 17.2 ° C) (1 Btu = 1055 J). BURNER. A device for the final conveyance of the gas, or a mixture of gas and air, to the combustion zone. Induced draft. A burner that depends on draft induced by a fan that is an integral part of the appliance and is located downstream from the burner. Power. A burner in which gas, air or both are supplied at pressures exceeding, for gas, the line pressure, and for air, atmospheric pressure, with t his added pressure being applied at the burner. CHIMNEY. A primarily vertical structure containing one or more flues used to remove hot gases from burning fuel, refuse, or industrial processes from a fuel - burning appliance to the outdoor atmosphere. Factor y - built chimney. A listed and labeled chimney composed of factory - made components, assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 5 Masonry chimney. A field - constructed chimney composed of solid mason ry units, bricks, stones or concrete. Metal chimney. A field - constructed chimney composed of metal. CLEARANCE. The minimum distance through air measured between the heat - producing surface of the mechanical appliance, device or equipment and the surface of the combustible material or assembly. CLOTHES DRYER. An appliance used to dry wet laundry by means of heated air. Dryer classifications are as follows: Type 1. Factory - built package, multiple production. Primarily used in family living environment. Usually the smallest unit physically and in function output. Type 2. Factory - built package, multiple production. Used in business with direct intercourse of the functi on with the public. Not designed for use in individual family living environment. COMBUSTIBLE ASSEMBLY. Wall, floor, ceiling or other assembly constructed of one or more component mate- rials that are not defined as noncombustible. COMBUSTIBLE MATERIAL. Any material not defined as noncombustible. COMBUSTION. In the context of this code, refers to the rapid oxidation of fuel accompanied by the production of heat or heat and light. COMBUSTION AIR . Air necessary for complete combustion of a fuel, including theor etical air and excess air. COMBUSTION CHAMBER. The portion of an appliance within which combustion occurs. COMBUSTION PRODUCTS. Constituents resulting from the combustion of a fuel with the oxygen of the air, including inert gases, but excluding excess air. CONCEALED LOCATION. A location that cannot be accessed without damaging permanent parts of the building structure or finished surface. Spaces above, below or behind readily removable panels or doors shall not be considered as concealed. CONCEAL ED PIPING. Piping that is located in a concealed location (see “Concealed location ”). CONDENSATE. The liquid that condenses from a gas (including flue gas) caused by a reduction in temperature or increase in pressure. CONNECTOR, APPLIANCE (Fuel). Rigid metallic pipe and fittings or a listed and labeled device that connects an appliance to the gas piping system. CONNECTOR, CHIMNEY OR VENT. The pipe that connects an appliance to a chimney or vent. CONTROL. A manual or automatic device designed to re gulate the gas, air, water or electrical supply to, or operation of, a mechanical system. CONVERSION BURNER. A unit consisting of a burner and its controls for installation in an appliance originally uti- lizing another fuel. COUNTER APPLIANCES. Appliances s uch as coffee brewers and coffee urns and any appurtenant water - heating ap- pliance, food and dish warmers, hot plates, griddles, waffle bakers and other appliances designed for installation on or in a counter. CUBIC FOOT. The amount of gas that occupies 1 c ubic foot (0.02832 m 3 ) when at a temperature of 60°F ( 15.6 ° C), saturated with water vapor and under a pressure equivalent to that of 30 inches of mercury (101 kPa). DAMPER. A manually or automatically controlled device to regulate draft or the rate of flow of air or combustion gases. DECORATIVE APPLIANCE, VENTED. A vented appliance wherein the primary function lies in the aesthetic effect of the flames. DEFINITIONS 2 - 6 2022 NEW YORK CITY FUEL GAS CODE DECORATIVE APPLIANCES FOR INSTALLATION IN VENTED FIREPLACES. A vented appliance de- signed for installa tion within the fire chamber of a vented fireplace, wherein the primary function lies in the aesthetic effect of the flames. DECORATIVE SHROUD. A listed, partial, noncombustible enclosure for aesthetic purposes that is installed at the termination of a ven ting system that surrounds or conceals a factory - built chimney system or vent cap. DEMAND. The maximum amount of gas input required per unit of time, usually expressed in cubic feet per hour (1 ft 3 = 0.0283 m 3 ), or Btu/h (1 Btu/h = 0.2931 W). DILUTION AIR. Air that is introduced into a draft hood and is mixed with the flue gases. DIRECT - VENT APPLIANCES. Appliances that are constructed and installed so that all air for combustion is derived directly from the outdo or atmosphere and all flue gases are discharged directly to the outdoor atmosphere. DRAFT. The pressure difference existing between the appliance or any component part and the atmosphere, that causes a continuous flow of air and products of combustion thro ugh the gas passages of the appliance to the atmos- phere. Induced draft. The pressure difference created by the action of a fan, blower or ejector, that is located between the appliance and the chimney or vent termination. Natural draft. The pressure difference created by a vent or chimney because of its height, and the temperature difference between the flue gases and the atmosphere. DRAFT HOOD. A nonadjustable device built into an appliance, or made as part of the vent connector from an appl iance, that is designed to (1) provide for ready escape of the flue gases from the appliance in the event of no draft, backdraft or stoppage beyond the draft hood, (2) prevent a backdraft from entering the appliance, and (3) neutralize the effect of stack action of the chimney or gas vent upon operation of the appliance. DRAFT REGULATOR. A device that functions to maintain a desired draft in the appliance by automatically reducing the draft to the desired value. DRIP. A nipple and cap placed at a low point in a system of piping to collect condensate and from which the conden- sate is removable. DRY GAS. A gas having a moisture and hydrocarbon dew point below any normal temperature to which the gas piping is exposed. DUCT FURNACE. A warm - air furnace or heater n ormally installed in an air distribution duct to supply warm air for heating. This definition shall apply only to a warm - air heating appliance that, for air circulation, depends on a blower not furnished as part of the furnace. DUCT SYSTEM. A continuous pa ssageway for the transmission of air that, in addition to ducts, includes duct fittings, dampers, plenums, fans and accessory air - handling equipment and appliances . DWELLING. A building or structure which is occupied in whole or in part as the home, residence or sleeping place of one or more families. DWELLING UNIT. A single unit consisting of one or more habitable rooms and occupied or arranged to be occupied as a unit separa te from all other units within a dwelling. EQUIPMENT. Any apparatus or device that delivers gas as a fuel or raw material to an appliance or vents combustion products from an appliance, including but not limited to control devices, pressure regulators, val ves, appliance appurtenances, gas connectors, or power exhausters used in connections to appliances. EXCESS FLOW VALVE (EFV). A safety shut - off valve designed to activate to interrupt the flow of gas when the fuel gas passing through it exceeds a prescribe d flow rate. Installed where specifically required by code or utility company. EXHAUST. Air being removed from any space, appliance or piece of equipment conveyed directly to the atmosphere by means of openings or ducts. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 7 EXTERIOR MASONRY CHIMNEYS. Masonry chimneys exposed to the outdoors on one or more sides below the roof line. FIREPLACE. An assembly consisting of a hearth and fire chamber of noncombustible material and provided with a chimney , for use with solid fuels. Factory - built fireplace. A listed and labeled fireplace and chimney system composed of factory - made compo- nents , and assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. Masonry fireplace. A hearth and fire chamber of s olid masonry units such as bricks, stones, listed masonry units or reinforced concrete, provided with a suitable chimney. FLAME SAFEGUARD. A device that will automatically shut off the fuel supply to a main burner or group of burners when the means of igni tion of such burners becomes inoperative, and when flame failure occurs on the burner or group of burners. FLASHBACK ARRESTOR CHECK VALVE. A device that will prevent the backflow of one gas into the supply system of another gas and prevent the passage of flame into the gas supply system. FLOOR FURNACE. A completely self - contained furnace suspended from the floor of the space being heated, ta king air for combustion from outside such space and with means for observing flames and lighting the appliance from such space. Fan type. A floor furnace equipped with a fan that provides the primary means for circulating air. Gravity type. A floor furnace depending primarily on circulation of air by gravity. This classification shall also include floor furnaces equipped with booster - type fans that do not materially restrict free circulation of air by gravity flow when such fans are not in operation. FLUE. A passageway within a chimney or vent through which gaseous combustion products pass. FLUE, APPLIANCE. The passage(s) within an appliance through which combustion products pass from the combustion chamber of the appliance to the draft hood inlet opening on an appliance equipped with a draft hood or to the outlet of the appliance on an appliance not equipped with a draft hood. FLUE COLLAR. That portion of an appliance designed for the attachment of a draft hood, vent connector or venting system. FL UE GASES. Products of combustion plus excess air in fireplace and appliance flues or heat exchangers. FLUE LINER (LINING). A system or material used to form the inside surface of a flue in a chimney or vent, for the purpose of protecting the surrounding st ructure from the effects of combustion products and for conveying combustion products without leakage into the atmosphere. FUEL GAS. A natural gas, manufactured gas, liquefied petroleum gas or mixtures of these gases. FURNACE. A completely self - contained h eating unit that is designed to supply heated air to spaces remote from or adjacent to the appliance location. FURNACE, CENTRAL. A self - contained appliance for heating air by transfer of heat of combustion through metal to the air, and designed to supply h eated air through ducts to spaces remote from or adjacent to the appliance location. Forced - air type. A central furnace equipped with a fan or blower that provides the primary means for circulation of air. FURNACE PLENUM. An air compartment or chamber to which one or more ducts are connected and that forms part of an air distribution system. GAS CONVENIENCE OUTLET. A permanently mounted, manually operated device that provides the means for connecting an appliance to, and d isconnecting an appliance from, the supply piping. The device includes an integral, manually operated valve with a nondisplaceable valve member and is designed so that disconnection of an appliance only occurs when the manually operated valve is in the clo sed position. 2022 NEW YORK CITY FUEL GAS CODE 2 - 1 ‡‡‡ Chapter 2 was amended by Local Law 77 of 2023 . This law has an effective date of June 10, 2023. CHAPTER 2 DEFINITIONS SECTION FGC 201 GENERAL 201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code and standard, have the meanings indicated in this chapter. 201.2 Inter changeability. Words used in the present tense include the future; words in the masculine gender in- clude the feminine and neuter; the singular number includes the plural and the plural, the singular. 201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the New York City Electrical Code , New York City Building Code , New York City Fire Code , New York City Mechanical Code , New York City Plumbing Code , or the New York City Energy Conservation Code , such terms shall have meanings ascribed to them as in those codes. ‡‡‡ 201.3.1 Terms defined in the general administrative provisions. The following terms are defined in Sec- tion 28 - 101.5 of the Administrative Code : 1968 BUILDING CODE. 1968 OR PRIOR CODE BUILDINGS OR STRUCTURES (PRIOR CODE BUILDINGS). ACCEPTANCE OR ACCEPTED. ADDITION. ADMINISTRATIVE CODE. ALTERATION. APPROVAL OR APPROVED. APPROVED AGENCY. APPROVED FABRICATOR. APPROVED INSPECTION AGENCY. APPROVED TESTING AGENCY. ARCHITECT. BUILDING. CERTIFICATE OF COMPLIANCE. CHARTER. CITY. COMMISSIONER. CONSTRUCTION DOCUMENTS. DAY. DEFERRED SUBMITTAL. DEMOLITION. DEMOLITION, FULL. DEFINITIONS 2 - 2 2022 NEW YORK CITY FUEL GAS CODE DEMOLITION, PARTIAL. DEPARTMENT. ENGINEER. ENLARGEMENT. ENVIRONMENTAL CONTROL BOARD or ECB. EXISTING BUILDING OR STRUCTUR E. FABRICATED ITEM. FIRE PROTECTION PLAN. HEREAFTER. HERETOFORE. INSPECTION CERTIFICATE. INTERIM CERTIFICATE OF OCCUPANCY. LABEL. LABELED. LAND SURVEYOR. LANDSCAPE ARCHITECT. LETTER OF COMPLETION. LIMITED ALTERATION APPLICATION. LIMITED PLUMBING ALTERATIONS. LIMITED SPRINKLER ALTERATIONS. LIMITED STANDPIPE ALTERATIONS. LISTED. MAIN USE OR DOMINANT OCCUPANCY (OF A BUILDING). MANUFACTURER’S DESIGNATION. MARK. MATERIALS. OCCUPANCY. OWNER. PARTY WALL. PERMIT. PERSON. PREMISES. PRIOR CODE BUILDING. PROFESSIONAL CERTIFICATION. PROGRESS INSPECTION. PROJECT. REGISTERED DESIGN PROFESSIONAL. REGISTERED DESIGN PROFESSIONAL OF RECORD. REQUIRED. RETAINING WALL. SERVICE EQUIPMENT. SIGN - OFF. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 3 SINGLE ROOM OCCUPANCY MULTIPLE DWELLING. SPECIAL INSPECTION . SPECIAL INSPECTION AGENCY. SPECIAL INSPECTOR. STRUCTURE. SUBMITTAL DOCUMENTS. SUPERINTENDENT OF CONSTRUCTION (CONSTRUCTION SUPERINTENDENT). USE (USED). UTILITY COMPANY OR PUBLIC UTILITY COMPANY. UTILITY CORPORATION OR PUBLIC UTILITY CORPORATION. WORK NOT CONSTITUTING MINOR ALTERATIONS OR ORDINARY REPAIRS. WRITING (WRITTEN). WRITTEN NOTICE. ZONING RESOLUTION. 201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have ordin arily accepted meanings such as the context implies. ‡‡‡ SECTION FGC 202 GENERAL DEFINITIONS ABNORMAL OPERATING CONDITION. A condition that may indicate a malfunction or a noncompliant com- ponent of a piping system or appliance. ACCESS (TO). That which enables a device, fixture, appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel, door or similar obstruction (see also “Ready access (to) ”). AIR CONDITIONER, GAS - FIRED. A gas - b urning, automatically operated appliance for supplying cooled or dehumidified air or chilled liquid. AIR CONDITIONING. The treatment of air so as to control simultaneously the temperature, humidity, cleanness and distribution of the air to meet the require ments of a conditioned space. AIR, EXHAUST. See “Exhaust.” AIR - HANDLING UNIT. A blower or fan used for the purpose of distributing supply air to a room, space or area. AIR, MAKEUP. Any combination of outdoor and transfer air intended to replace exhaust air and exfiltration. APPLIANCE. Any apparatus or device that utilizes a fuel or raw material to produce light, heat, power, refrigeration or air conditioning. APPLIANCE, AUTOMATICALLY CONTROLLED. Appliances equipped with an automatic b urner ignition and safety shutoff device and other automatic devices which accomplish complete turn - on and shutoff of the gas to the main burner or burners, and graduate the gas supply to the burner or burners, but do not affect complete shutoff of the gas . APPLIANCE TYPE. Low - heat appliance (residential appliance). Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of 1,000 ° F (538 ° C) or less. Medium - heat appliance. Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of more than 1,000 ° F (538 ° C ) or less but not greater than 2,000 ° F ( 1093 .3° C). DEFINITIONS 2 - 4 2022 NEW YORK CITY FUEL GAS CODE APPLIANCE, UNVENTED. An appliance designed or installed in such a manner that the products of combustion are not conveyed by a vent or chimney directly to the outdoor atmosphere. APPLIANCE, VENTED. An appliance designed and installed in such a manner that all of the products o f com- bustion are conveyed directly from the appliance to the outdoor atmosphere through an approved chimney or vent system. See also “VENTED APPLIANCE CATEGORIES.” ATMOSPHERIC PRESSURE. The pressure of the weight of air and water vapor on the surface of th e earth, ap- proximately 14.7 pounds per square inch (psi) (101 kPa absolute) at sea level. BAFFLE. An object placed in an appliance to change the direction of or retard the flow of air, air - gas mixtures or flue gases. BAROMETRIC DRAFT REGULATOR. A balanced damper device attached to a chimney, vent connector, breeching or flue gas manifold to protect combustion appliances by controlling chimney draft. A double - acting barometric draft regulator is one in which the balancing damper is free to move in either direction to protect combustion appliances from both excessive draft and backdraft. BOILER, HIGH - PRESSURE. An appliance for supplying steam or hot water that, for a steam boiler, operates at a pressure of more than 15 psig ( 103.4 kPa gauge), and for a hot water boiler, operates at a pressure exceeding 160 psig ( 1103 kPa gauge) or at a temperature exceeding 250° F ( 121.1 °C). BOILER, LOW - PRESSURE. A self - contained appliance for supplying steam or hot water as follows: Hot water heating boiler. A boiler in which no steam is generated, from which hot water is circulated for heating purposes and then returned to the boiler, and that operates at water pressures not exceeding 160 pounds per square inch gauge (psig) ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Hot water supply boiler. A boiler, completely fill ed with water, which furnishes hot water to be used externally to itself, and that operates at water pressures not exceeding 160 psig ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Steam heating boile r. A boiler in which steam is generated and that operates at a steam pressure not exceeding 15 psig ( 103.4 kPa gauge). BRANCH. A section of gas piping downstream from a riser, leading to appliances or equipment on no more than two consecutive floors. BRAZING. A metal - joining process wherein coalescence is produced by the use of a nonferrous filler metal having a melting point above 1,000°F ( 537.8 ° C), but lower than that of the base metal being joined. The filler material is distributed between the clos ely fitted surfaces of the joint by capillary action. BROILER. A general term including salamanders, barbecues and other appliances cooking primarily by radiated heat, excepting toasters. BTU. Abbreviation for British thermal unit, which is the quantity of heat required to raise the temperature of 1 pound (454 g) of water 1°F ( - 17.2 ° C) (1 Btu = 1055 J). BURNER. A device for the final conveyance of the gas, or a mixture of gas and air, to the combustion zone. Induced draft. A burner that depends on draft induced by a fan that is an integral part of the appliance and is located downstream from the burner. Power. A burner in which gas, air or both are supplied at pressures exceeding, for gas, the line pressure, and for air, atmospheric pressure, with t his added pressure being applied at the burner. CHIMNEY. A primarily vertical structure containing one or more flues used to remove hot gases from burning fuel, refuse, or industrial processes from a fuel - burning appliance to the outdoor atmosphere. Factor y - built chimney. A listed and labeled chimney composed of factory - made components, assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 5 Masonry chimney. A field - constructed chimney composed of solid mason ry units, bricks, stones or concrete. Metal chimney. A field - constructed chimney composed of metal. CLEARANCE. The minimum distance through air measured between the heat - producing surface of the mechanical appliance, device or equipment and the surface of the combustible material or assembly. CLOTHES DRYER. An appliance used to dry wet laundry by means of heated air. Dryer classifications are as follows: Type 1. Factory - built package, multiple production. Primarily used in family living environment. Usually the smallest unit physically and in function output. Type 2. Factory - built package, multiple production. Used in business with direct intercourse of the functi on with the public. Not designed for use in individual family living environment. COMBUSTIBLE ASSEMBLY. Wall, floor, ceiling or other assembly constructed of one or more component mate- rials that are not defined as noncombustible. COMBUSTIBLE MATERIAL. Any material not defined as noncombustible. COMBUSTION. In the context of this code, refers to the rapid oxidation of fuel accompanied by the production of heat or heat and light. COMBUSTION AIR . Air necessary for complete combustion of a fuel, including theor etical air and excess air. COMBUSTION CHAMBER. The portion of an appliance within which combustion occurs. COMBUSTION PRODUCTS. Constituents resulting from the combustion of a fuel with the oxygen of the air, including inert gases, but excluding excess air. CONCEALED LOCATION. A location that cannot be accessed without damaging permanent parts of the building structure or finished surface. Spaces above, below or behind readily removable panels or doors shall not be considered as concealed. CONCEAL ED PIPING. Piping that is located in a concealed location (see “Concealed location ”). CONDENSATE. The liquid that condenses from a gas (including flue gas) caused by a reduction in temperature or increase in pressure. CONNECTOR, APPLIANCE (Fuel). Rigid metallic pipe and fittings or a listed and labeled device that connects an appliance to the gas piping system. CONNECTOR, CHIMNEY OR VENT. The pipe that connects an appliance to a chimney or vent. CONTROL. A manual or automatic device designed to re gulate the gas, air, water or electrical supply to, or operation of, a mechanical system. CONVERSION BURNER. A unit consisting of a burner and its controls for installation in an appliance originally uti- lizing another fuel. COUNTER APPLIANCES. Appliances s uch as coffee brewers and coffee urns and any appurtenant water - heating ap- pliance, food and dish warmers, hot plates, griddles, waffle bakers and other appliances designed for installation on or in a counter. CUBIC FOOT. The amount of gas that occupies 1 c ubic foot (0.02832 m 3 ) when at a temperature of 60°F ( 15.6 ° C), saturated with water vapor and under a pressure equivalent to that of 30 inches of mercury (101 kPa). DAMPER. A manually or automatically controlled device to regulate draft or the rate of flow of air or combustion gases. DECORATIVE APPLIANCE, VENTED. A vented appliance wherein the primary function lies in the aesthetic effect of the flames. DEFINITIONS 2 - 6 2022 NEW YORK CITY FUEL GAS CODE DECORATIVE APPLIANCES FOR INSTALLATION IN VENTED FIREPLACES. A vented appliance de- signed for installa tion within the fire chamber of a vented fireplace, wherein the primary function lies in the aesthetic effect of the flames. DECORATIVE SHROUD. A listed, partial, noncombustible enclosure for aesthetic purposes that is installed at the termination of a ven ting system that surrounds or conceals a factory - built chimney system or vent cap. DEMAND. The maximum amount of gas input required per unit of time, usually expressed in cubic feet per hour (1 ft 3 = 0.0283 m 3 ), or Btu/h (1 Btu/h = 0.2931 W). DILUTION AIR. Air that is introduced into a draft hood and is mixed with the flue gases. DIRECT - VENT APPLIANCES. Appliances that are constructed and installed so that all air for combustion is derived directly from the outdo or atmosphere and all flue gases are discharged directly to the outdoor atmosphere. DRAFT. The pressure difference existing between the appliance or any component part and the atmosphere, that causes a continuous flow of air and products of combustion thro ugh the gas passages of the appliance to the atmos- phere. Induced draft. The pressure difference created by the action of a fan, blower or ejector, that is located between the appliance and the chimney or vent termination. Natural draft. The pressure difference created by a vent or chimney because of its height, and the temperature difference between the flue gases and the atmosphere. DRAFT HOOD. A nonadjustable device built into an appliance, or made as part of the vent connector from an appl iance, that is designed to (1) provide for ready escape of the flue gases from the appliance in the event of no draft, backdraft or stoppage beyond the draft hood, (2) prevent a backdraft from entering the appliance, and (3) neutralize the effect of stack action of the chimney or gas vent upon operation of the appliance. DRAFT REGULATOR. A device that functions to maintain a desired draft in the appliance by automatically reducing the draft to the desired value. DRIP. A nipple and cap placed at a low point in a system of piping to collect condensate and from which the conden- sate is removable. DRY GAS. A gas having a moisture and hydrocarbon dew point below any normal temperature to which the gas piping is exposed. DUCT FURNACE. A warm - air furnace or heater n ormally installed in an air distribution duct to supply warm air for heating. This definition shall apply only to a warm - air heating appliance that, for air circulation, depends on a blower not furnished as part of the furnace. DUCT SYSTEM. A continuous pa ssageway for the transmission of air that, in addition to ducts, includes duct fittings, dampers, plenums, fans and accessory air - handling equipment and appliances . DWELLING. A building or structure which is occupied in whole or in part as the home, residence or sleeping place of one or more families. DWELLING UNIT. A single unit consisting of one or more habitable rooms and occupied or arranged to be occupied as a unit separa te from all other units within a dwelling. EQUIPMENT. Any apparatus or device that delivers gas as a fuel or raw material to an appliance or vents combustion products from an appliance, including but not limited to control devices, pressure regulators, val ves, appliance appurtenances, gas connectors, or power exhausters used in connections to appliances. EXCESS FLOW VALVE (EFV). A safety shut - off valve designed to activate to interrupt the flow of gas when the fuel gas passing through it exceeds a prescribe d flow rate. Installed where specifically required by code or utility company. EXHAUST. Air being removed from any space, appliance or piece of equipment conveyed directly to the atmosphere by means of openings or ducts. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 7 EXTERIOR MASONRY CHIMNEYS. Masonry chimneys exposed to the outdoors on one or more sides below the roof line. FIREPLACE. An assembly consisting of a hearth and fire chamber of noncombustible material and provided with a chimney , for use with solid fuels. Factory - built fireplace. A listed and labeled fireplace and chimney system composed of factory - made compo- nents , and assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. Masonry fireplace. A hearth and fire chamber of s olid masonry units such as bricks, stones, listed masonry units or reinforced concrete, provided with a suitable chimney. FLAME SAFEGUARD. A device that will automatically shut off the fuel supply to a main burner or group of burners when the means of igni tion of such burners becomes inoperative, and when flame failure occurs on the burner or group of burners. FLASHBACK ARRESTOR CHECK VALVE. A device that will prevent the backflow of one gas into the supply system of another gas and prevent the passage of flame into the gas supply system. FLOOR FURNACE. A completely self - contained furnace suspended from the floor of the space being heated, ta king air for combustion from outside such space and with means for observing flames and lighting the appliance from such space. Fan type. A floor furnace equipped with a fan that provides the primary means for circulating air. Gravity type. A floor furnace depending primarily on circulation of air by gravity. This classification shall also include floor furnaces equipped with booster - type fans that do not materially restrict free circulation of air by gravity flow when such fans are not in operation. FLUE. A passageway within a chimney or vent through which gaseous combustion products pass. FLUE, APPLIANCE. The passage(s) within an appliance through which combustion products pass from the combustion chamber of the appliance to the draft hood inlet opening on an appliance equipped with a draft hood or to the outlet of the appliance on an appliance not equipped with a draft hood. FLUE COLLAR. That portion of an appliance designed for the attachment of a draft hood, vent connector or venting system. FL UE GASES. Products of combustion plus excess air in fireplace and appliance flues or heat exchangers. FLUE LINER (LINING). A system or material used to form the inside surface of a flue in a chimney or vent, for the purpose of protecting the surrounding st ructure from the effects of combustion products and for conveying combustion products without leakage into the atmosphere. FUEL GAS. A natural gas, manufactured gas, liquefied petroleum gas or mixtures of these gases. FURNACE. A completely self - contained h eating unit that is designed to supply heated air to spaces remote from or adjacent to the appliance location. FURNACE, CENTRAL. A self - contained appliance for heating air by transfer of heat of combustion through metal to the air, and designed to supply h eated air through ducts to spaces remote from or adjacent to the appliance location. Forced - air type. A central furnace equipped with a fan or blower that provides the primary means for circulation of air. FURNACE PLENUM. An air compartment or chamber to which one or more ducts are connected and that forms part of an air distribution system. GAS CONVENIENCE OUTLET. A permanently mounted, manually operated device that provides the means for connecting an appliance to, and d isconnecting an appliance from, the supply piping. The device includes an integral, manually operated valve with a nondisplaceable valve member and is designed so that disconnection of an appliance only occurs when the manually operated valve is in the clo sed position. DEFINITIONS 2 - 8 2022 NEW YORK CITY FUEL GAS CODE GAS PIPING. An installation of pipe, valves or fittings installed on a premises or in a building and utilized to convey fuel gas. GAS UTILIZATION EQUIPMENT. An appliance that utilizes gas as a fuel or raw material or both. HAZARDOUS LOCATION. Any location considered to be a fire hazard for flammable vapors, dust, combustible fibers or other highly combustible substances. The location is not necessarily categorized in the New York City Building Code as a high - hazard group classification. HOUSE PIPING. See “Piping system.” HYDROGEN FUEL GAS ROOM. A separately ventilated, fully enclosed room designed to exclusively house the generation of gaseous hydrogen for immediate on - premises use in indoor fuel cells or other energy production process, and incidental indoor storage of gaseous hydrogen. A hydro gen fuel gas room is not intended to house the production or dispensing of hydrogen motor fuel. IGNITION SOURCE. A flame, spark or hot surface capable of igniting flammable vapors or fumes. Such sources include appliance burners, burner ignitors, and elect rical switching devices. INCINERATOR. An appliance used to reduce combustible refuse material to ashes and that is manufactured, sold and installed as a complete unit. INDUSTRIAL AIR HEATERS, NONRECIRCULATING DIRECT - FIRED . A heater in which all the product s of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating only outdoor air. INDUSTRIAL AIR HEATERS, RECIRCULATING DIRECT - FIRED . A heater in which all the pro ducts of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating outdoor air, and, if applicable, indoor air. INFRARED RADIANT HEATER. A heater that directs a s ubstantial amount of its energy output in the form of infrared radiant energy into the area to be heated. Such heaters are of either the vented or unvented type. INTEGRAL VENT APPLIANCES. Appliances designed for outdoor installation that have built - in natu ral or me- chanical venting means and are constructed and installed so that all air for combustion is derived from the outdoor atmosphere and all flue gases are discharged to the outdoor atmosphere through an integral vent termination. INTERLOCK. A device actuated by another device with which it is directly associated, to govern succeeding oper- ations of the same or allied devices. A circuit in which a given action cannot occur until after one or more other actions have taken place. JOINT, FLANGED. A joint made by bolting together a pair of flanged ends. JOINT, FLARED. A metal - to - metal compression joint in which a conical spread is made on the end of a tube that is compressed by a flare nut against a mating flare. JOINT, MECHANICAL. A general form o f gas - tight joints obtained by the joining of metal parts through a positive - holding mechanical construction, such as press joint, flanged joint, threaded joint, flared joint or compression joint. JOINT, PLASTIC ADHESIVE. A joint made in thermoset plastic piping by the use of an adhesive substance that forms a continuous bond between the mating surfaces without dissolving either one of them. JOINT, PLASTIC HEAT FUSION. A joint made in thermoplastic piping by heating the parts sufficiently to permit fusion o f the materials when the parts are pressed together. JOINT, WELDED. A gas - tight joint obtained by the joining of metal parts in molten state. LEAK CHECK. An operation performed on a gas piping system to verify that the system does not leak. Leakage checks are intended to discover open outlets, defective appliance connection and defects that have developed since the initial installation, normally performed after pressure testing. LIMIT CONTROL. A device responsive to changes in pressure, temperature or level for turning on, shutting off or throttling the gas supply to an appliance. 2022 NEW YORK CITY FUEL GAS CODE 2 - 1 ‡‡‡ Chapter 2 was amended by Local Law 77 of 2023 . This law has an effective date of June 10, 2023. CHAPTER 2 DEFINITIONS SECTION FGC 201 GENERAL 201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code and standard, have the meanings indicated in this chapter. 201.2 Inter changeability. Words used in the present tense include the future; words in the masculine gender in- clude the feminine and neuter; the singular number includes the plural and the plural, the singular. 201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the New York City Electrical Code , New York City Building Code , New York City Fire Code , New York City Mechanical Code , New York City Plumbing Code , or the New York City Energy Conservation Code , such terms shall have meanings ascribed to them as in those codes. ‡‡‡ 201.3.1 Terms defined in the general administrative provisions. The following terms are defined in Sec- tion 28 - 101.5 of the Administrative Code : 1968 BUILDING CODE. 1968 OR PRIOR CODE BUILDINGS OR STRUCTURES (PRIOR CODE BUILDINGS). ACCEPTANCE OR ACCEPTED. ADDITION. ADMINISTRATIVE CODE. ALTERATION. APPROVAL OR APPROVED. APPROVED AGENCY. APPROVED FABRICATOR. APPROVED INSPECTION AGENCY. APPROVED TESTING AGENCY. ARCHITECT. BUILDING. CERTIFICATE OF COMPLIANCE. CHARTER. CITY. COMMISSIONER. CONSTRUCTION DOCUMENTS. DAY. DEFERRED SUBMITTAL. DEMOLITION. DEMOLITION, FULL. DEFINITIONS 2 - 2 2022 NEW YORK CITY FUEL GAS CODE DEMOLITION, PARTIAL. DEPARTMENT. ENGINEER. ENLARGEMENT. ENVIRONMENTAL CONTROL BOARD or ECB. EXISTING BUILDING OR STRUCTUR E. FABRICATED ITEM. FIRE PROTECTION PLAN. HEREAFTER. HERETOFORE. INSPECTION CERTIFICATE. INTERIM CERTIFICATE OF OCCUPANCY. LABEL. LABELED. LAND SURVEYOR. LANDSCAPE ARCHITECT. LETTER OF COMPLETION. LIMITED ALTERATION APPLICATION. LIMITED PLUMBING ALTERATIONS. LIMITED SPRINKLER ALTERATIONS. LIMITED STANDPIPE ALTERATIONS. LISTED. MAIN USE OR DOMINANT OCCUPANCY (OF A BUILDING). MANUFACTURER’S DESIGNATION. MARK. MATERIALS. OCCUPANCY. OWNER. PARTY WALL. PERMIT. PERSON. PREMISES. PRIOR CODE BUILDING. PROFESSIONAL CERTIFICATION. PROGRESS INSPECTION. PROJECT. REGISTERED DESIGN PROFESSIONAL. REGISTERED DESIGN PROFESSIONAL OF RECORD. REQUIRED. RETAINING WALL. SERVICE EQUIPMENT. SIGN - OFF. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 3 SINGLE ROOM OCCUPANCY MULTIPLE DWELLING. SPECIAL INSPECTION . SPECIAL INSPECTION AGENCY. SPECIAL INSPECTOR. STRUCTURE. SUBMITTAL DOCUMENTS. SUPERINTENDENT OF CONSTRUCTION (CONSTRUCTION SUPERINTENDENT). USE (USED). UTILITY COMPANY OR PUBLIC UTILITY COMPANY. UTILITY CORPORATION OR PUBLIC UTILITY CORPORATION. WORK NOT CONSTITUTING MINOR ALTERATIONS OR ORDINARY REPAIRS. WRITING (WRITTEN). WRITTEN NOTICE. ZONING RESOLUTION. 201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have ordin arily accepted meanings such as the context implies. ‡‡‡ SECTION FGC 202 GENERAL DEFINITIONS ABNORMAL OPERATING CONDITION. A condition that may indicate a malfunction or a noncompliant com- ponent of a piping system or appliance. ACCESS (TO). That which enables a device, fixture, appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel, door or similar obstruction (see also “Ready access (to) ”). AIR CONDITIONER, GAS - FIRED. A gas - b urning, automatically operated appliance for supplying cooled or dehumidified air or chilled liquid. AIR CONDITIONING. The treatment of air so as to control simultaneously the temperature, humidity, cleanness and distribution of the air to meet the require ments of a conditioned space. AIR, EXHAUST. See “Exhaust.” AIR - HANDLING UNIT. A blower or fan used for the purpose of distributing supply air to a room, space or area. AIR, MAKEUP. Any combination of outdoor and transfer air intended to replace exhaust air and exfiltration. APPLIANCE. Any apparatus or device that utilizes a fuel or raw material to produce light, heat, power, refrigeration or air conditioning. APPLIANCE, AUTOMATICALLY CONTROLLED. Appliances equipped with an automatic b urner ignition and safety shutoff device and other automatic devices which accomplish complete turn - on and shutoff of the gas to the main burner or burners, and graduate the gas supply to the burner or burners, but do not affect complete shutoff of the gas . APPLIANCE TYPE. Low - heat appliance (residential appliance). Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of 1,000 ° F (538 ° C) or less. Medium - heat appliance. Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of more than 1,000 ° F (538 ° C ) or less but not greater than 2,000 ° F ( 1093 .3° C). DEFINITIONS 2 - 4 2022 NEW YORK CITY FUEL GAS CODE APPLIANCE, UNVENTED. An appliance designed or installed in such a manner that the products of combustion are not conveyed by a vent or chimney directly to the outdoor atmosphere. APPLIANCE, VENTED. An appliance designed and installed in such a manner that all of the products o f com- bustion are conveyed directly from the appliance to the outdoor atmosphere through an approved chimney or vent system. See also “VENTED APPLIANCE CATEGORIES.” ATMOSPHERIC PRESSURE. The pressure of the weight of air and water vapor on the surface of th e earth, ap- proximately 14.7 pounds per square inch (psi) (101 kPa absolute) at sea level. BAFFLE. An object placed in an appliance to change the direction of or retard the flow of air, air - gas mixtures or flue gases. BAROMETRIC DRAFT REGULATOR. A balanced damper device attached to a chimney, vent connector, breeching or flue gas manifold to protect combustion appliances by controlling chimney draft. A double - acting barometric draft regulator is one in which the balancing damper is free to move in either direction to protect combustion appliances from both excessive draft and backdraft. BOILER, HIGH - PRESSURE. An appliance for supplying steam or hot water that, for a steam boiler, operates at a pressure of more than 15 psig ( 103.4 kPa gauge), and for a hot water boiler, operates at a pressure exceeding 160 psig ( 1103 kPa gauge) or at a temperature exceeding 250° F ( 121.1 °C). BOILER, LOW - PRESSURE. A self - contained appliance for supplying steam or hot water as follows: Hot water heating boiler. A boiler in which no steam is generated, from which hot water is circulated for heating purposes and then returned to the boiler, and that operates at water pressures not exceeding 160 pounds per square inch gauge (psig) ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Hot water supply boiler. A boiler, completely fill ed with water, which furnishes hot water to be used externally to itself, and that operates at water pressures not exceeding 160 psig ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Steam heating boile r. A boiler in which steam is generated and that operates at a steam pressure not exceeding 15 psig ( 103.4 kPa gauge). BRANCH. A section of gas piping downstream from a riser, leading to appliances or equipment on no more than two consecutive floors. BRAZING. A metal - joining process wherein coalescence is produced by the use of a nonferrous filler metal having a melting point above 1,000°F ( 537.8 ° C), but lower than that of the base metal being joined. The filler material is distributed between the clos ely fitted surfaces of the joint by capillary action. BROILER. A general term including salamanders, barbecues and other appliances cooking primarily by radiated heat, excepting toasters. BTU. Abbreviation for British thermal unit, which is the quantity of heat required to raise the temperature of 1 pound (454 g) of water 1°F ( - 17.2 ° C) (1 Btu = 1055 J). BURNER. A device for the final conveyance of the gas, or a mixture of gas and air, to the combustion zone. Induced draft. A burner that depends on draft induced by a fan that is an integral part of the appliance and is located downstream from the burner. Power. A burner in which gas, air or both are supplied at pressures exceeding, for gas, the line pressure, and for air, atmospheric pressure, with t his added pressure being applied at the burner. CHIMNEY. A primarily vertical structure containing one or more flues used to remove hot gases from burning fuel, refuse, or industrial processes from a fuel - burning appliance to the outdoor atmosphere. Factor y - built chimney. A listed and labeled chimney composed of factory - made components, assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 5 Masonry chimney. A field - constructed chimney composed of solid mason ry units, bricks, stones or concrete. Metal chimney. A field - constructed chimney composed of metal. CLEARANCE. The minimum distance through air measured between the heat - producing surface of the mechanical appliance, device or equipment and the surface of the combustible material or assembly. CLOTHES DRYER. An appliance used to dry wet laundry by means of heated air. Dryer classifications are as follows: Type 1. Factory - built package, multiple production. Primarily used in family living environment. Usually the smallest unit physically and in function output. Type 2. Factory - built package, multiple production. Used in business with direct intercourse of the functi on with the public. Not designed for use in individual family living environment. COMBUSTIBLE ASSEMBLY. Wall, floor, ceiling or other assembly constructed of one or more component mate- rials that are not defined as noncombustible. COMBUSTIBLE MATERIAL. Any material not defined as noncombustible. COMBUSTION. In the context of this code, refers to the rapid oxidation of fuel accompanied by the production of heat or heat and light. COMBUSTION AIR . Air necessary for complete combustion of a fuel, including theor etical air and excess air. COMBUSTION CHAMBER. The portion of an appliance within which combustion occurs. COMBUSTION PRODUCTS. Constituents resulting from the combustion of a fuel with the oxygen of the air, including inert gases, but excluding excess air. CONCEALED LOCATION. A location that cannot be accessed without damaging permanent parts of the building structure or finished surface. Spaces above, below or behind readily removable panels or doors shall not be considered as concealed. CONCEAL ED PIPING. Piping that is located in a concealed location (see “Concealed location ”). CONDENSATE. The liquid that condenses from a gas (including flue gas) caused by a reduction in temperature or increase in pressure. CONNECTOR, APPLIANCE (Fuel). Rigid metallic pipe and fittings or a listed and labeled device that connects an appliance to the gas piping system. CONNECTOR, CHIMNEY OR VENT. The pipe that connects an appliance to a chimney or vent. CONTROL. A manual or automatic device designed to re gulate the gas, air, water or electrical supply to, or operation of, a mechanical system. CONVERSION BURNER. A unit consisting of a burner and its controls for installation in an appliance originally uti- lizing another fuel. COUNTER APPLIANCES. Appliances s uch as coffee brewers and coffee urns and any appurtenant water - heating ap- pliance, food and dish warmers, hot plates, griddles, waffle bakers and other appliances designed for installation on or in a counter. CUBIC FOOT. The amount of gas that occupies 1 c ubic foot (0.02832 m 3 ) when at a temperature of 60°F ( 15.6 ° C), saturated with water vapor and under a pressure equivalent to that of 30 inches of mercury (101 kPa). DAMPER. A manually or automatically controlled device to regulate draft or the rate of flow of air or combustion gases. DECORATIVE APPLIANCE, VENTED. A vented appliance wherein the primary function lies in the aesthetic effect of the flames. DEFINITIONS 2 - 6 2022 NEW YORK CITY FUEL GAS CODE DECORATIVE APPLIANCES FOR INSTALLATION IN VENTED FIREPLACES. A vented appliance de- signed for installa tion within the fire chamber of a vented fireplace, wherein the primary function lies in the aesthetic effect of the flames. DECORATIVE SHROUD. A listed, partial, noncombustible enclosure for aesthetic purposes that is installed at the termination of a ven ting system that surrounds or conceals a factory - built chimney system or vent cap. DEMAND. The maximum amount of gas input required per unit of time, usually expressed in cubic feet per hour (1 ft 3 = 0.0283 m 3 ), or Btu/h (1 Btu/h = 0.2931 W). DILUTION AIR. Air that is introduced into a draft hood and is mixed with the flue gases. DIRECT - VENT APPLIANCES. Appliances that are constructed and installed so that all air for combustion is derived directly from the outdo or atmosphere and all flue gases are discharged directly to the outdoor atmosphere. DRAFT. The pressure difference existing between the appliance or any component part and the atmosphere, that causes a continuous flow of air and products of combustion thro ugh the gas passages of the appliance to the atmos- phere. Induced draft. The pressure difference created by the action of a fan, blower or ejector, that is located between the appliance and the chimney or vent termination. Natural draft. The pressure difference created by a vent or chimney because of its height, and the temperature difference between the flue gases and the atmosphere. DRAFT HOOD. A nonadjustable device built into an appliance, or made as part of the vent connector from an appl iance, that is designed to (1) provide for ready escape of the flue gases from the appliance in the event of no draft, backdraft or stoppage beyond the draft hood, (2) prevent a backdraft from entering the appliance, and (3) neutralize the effect of stack action of the chimney or gas vent upon operation of the appliance. DRAFT REGULATOR. A device that functions to maintain a desired draft in the appliance by automatically reducing the draft to the desired value. DRIP. A nipple and cap placed at a low point in a system of piping to collect condensate and from which the conden- sate is removable. DRY GAS. A gas having a moisture and hydrocarbon dew point below any normal temperature to which the gas piping is exposed. DUCT FURNACE. A warm - air furnace or heater n ormally installed in an air distribution duct to supply warm air for heating. This definition shall apply only to a warm - air heating appliance that, for air circulation, depends on a blower not furnished as part of the furnace. DUCT SYSTEM. A continuous pa ssageway for the transmission of air that, in addition to ducts, includes duct fittings, dampers, plenums, fans and accessory air - handling equipment and appliances . DWELLING. A building or structure which is occupied in whole or in part as the home, residence or sleeping place of one or more families. DWELLING UNIT. A single unit consisting of one or more habitable rooms and occupied or arranged to be occupied as a unit separa te from all other units within a dwelling. EQUIPMENT. Any apparatus or device that delivers gas as a fuel or raw material to an appliance or vents combustion products from an appliance, including but not limited to control devices, pressure regulators, val ves, appliance appurtenances, gas connectors, or power exhausters used in connections to appliances. EXCESS FLOW VALVE (EFV). A safety shut - off valve designed to activate to interrupt the flow of gas when the fuel gas passing through it exceeds a prescribe d flow rate. Installed where specifically required by code or utility company. EXHAUST. Air being removed from any space, appliance or piece of equipment conveyed directly to the atmosphere by means of openings or ducts. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 7 EXTERIOR MASONRY CHIMNEYS. Masonry chimneys exposed to the outdoors on one or more sides below the roof line. FIREPLACE. An assembly consisting of a hearth and fire chamber of noncombustible material and provided with a chimney , for use with solid fuels. Factory - built fireplace. A listed and labeled fireplace and chimney system composed of factory - made compo- nents , and assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. Masonry fireplace. A hearth and fire chamber of s olid masonry units such as bricks, stones, listed masonry units or reinforced concrete, provided with a suitable chimney. FLAME SAFEGUARD. A device that will automatically shut off the fuel supply to a main burner or group of burners when the means of igni tion of such burners becomes inoperative, and when flame failure occurs on the burner or group of burners. FLASHBACK ARRESTOR CHECK VALVE. A device that will prevent the backflow of one gas into the supply system of another gas and prevent the passage of flame into the gas supply system. FLOOR FURNACE. A completely self - contained furnace suspended from the floor of the space being heated, ta king air for combustion from outside such space and with means for observing flames and lighting the appliance from such space. Fan type. A floor furnace equipped with a fan that provides the primary means for circulating air. Gravity type. A floor furnace depending primarily on circulation of air by gravity. This classification shall also include floor furnaces equipped with booster - type fans that do not materially restrict free circulation of air by gravity flow when such fans are not in operation. FLUE. A passageway within a chimney or vent through which gaseous combustion products pass. FLUE, APPLIANCE. The passage(s) within an appliance through which combustion products pass from the combustion chamber of the appliance to the draft hood inlet opening on an appliance equipped with a draft hood or to the outlet of the appliance on an appliance not equipped with a draft hood. FLUE COLLAR. That portion of an appliance designed for the attachment of a draft hood, vent connector or venting system. FL UE GASES. Products of combustion plus excess air in fireplace and appliance flues or heat exchangers. FLUE LINER (LINING). A system or material used to form the inside surface of a flue in a chimney or vent, for the purpose of protecting the surrounding st ructure from the effects of combustion products and for conveying combustion products without leakage into the atmosphere. FUEL GAS. A natural gas, manufactured gas, liquefied petroleum gas or mixtures of these gases. FURNACE. A completely self - contained h eating unit that is designed to supply heated air to spaces remote from or adjacent to the appliance location. FURNACE, CENTRAL. A self - contained appliance for heating air by transfer of heat of combustion through metal to the air, and designed to supply h eated air through ducts to spaces remote from or adjacent to the appliance location. Forced - air type. A central furnace equipped with a fan or blower that provides the primary means for circulation of air. FURNACE PLENUM. An air compartment or chamber to which one or more ducts are connected and that forms part of an air distribution system. GAS CONVENIENCE OUTLET. A permanently mounted, manually operated device that provides the means for connecting an appliance to, and d isconnecting an appliance from, the supply piping. The device includes an integral, manually operated valve with a nondisplaceable valve member and is designed so that disconnection of an appliance only occurs when the manually operated valve is in the clo sed position. DEFINITIONS 2 - 8 2022 NEW YORK CITY FUEL GAS CODE GAS PIPING. An installation of pipe, valves or fittings installed on a premises or in a building and utilized to convey fuel gas. GAS UTILIZATION EQUIPMENT. An appliance that utilizes gas as a fuel or raw material or both. HAZARDOUS LOCATION. Any location considered to be a fire hazard for flammable vapors, dust, combustible fibers or other highly combustible substances. The location is not necessarily categorized in the New York City Building Code as a high - hazard group classification. HOUSE PIPING. See “Piping system.” HYDROGEN FUEL GAS ROOM. A separately ventilated, fully enclosed room designed to exclusively house the generation of gaseous hydrogen for immediate on - premises use in indoor fuel cells or other energy production process, and incidental indoor storage of gaseous hydrogen. A hydro gen fuel gas room is not intended to house the production or dispensing of hydrogen motor fuel. IGNITION SOURCE. A flame, spark or hot surface capable of igniting flammable vapors or fumes. Such sources include appliance burners, burner ignitors, and elect rical switching devices. INCINERATOR. An appliance used to reduce combustible refuse material to ashes and that is manufactured, sold and installed as a complete unit. INDUSTRIAL AIR HEATERS, NONRECIRCULATING DIRECT - FIRED . A heater in which all the product s of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating only outdoor air. INDUSTRIAL AIR HEATERS, RECIRCULATING DIRECT - FIRED . A heater in which all the pro ducts of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating outdoor air, and, if applicable, indoor air. INFRARED RADIANT HEATER. A heater that directs a s ubstantial amount of its energy output in the form of infrared radiant energy into the area to be heated. Such heaters are of either the vented or unvented type. INTEGRAL VENT APPLIANCES. Appliances designed for outdoor installation that have built - in natu ral or me- chanical venting means and are constructed and installed so that all air for combustion is derived from the outdoor atmosphere and all flue gases are discharged to the outdoor atmosphere through an integral vent termination. INTERLOCK. A device actuated by another device with which it is directly associated, to govern succeeding oper- ations of the same or allied devices. A circuit in which a given action cannot occur until after one or more other actions have taken place. JOINT, FLANGED. A joint made by bolting together a pair of flanged ends. JOINT, FLARED. A metal - to - metal compression joint in which a conical spread is made on the end of a tube that is compressed by a flare nut against a mating flare. JOINT, MECHANICAL. A general form o f gas - tight joints obtained by the joining of metal parts through a positive - holding mechanical construction, such as press joint, flanged joint, threaded joint, flared joint or compression joint. JOINT, PLASTIC ADHESIVE. A joint made in thermoset plastic piping by the use of an adhesive substance that forms a continuous bond between the mating surfaces without dissolving either one of them. JOINT, PLASTIC HEAT FUSION. A joint made in thermoplastic piping by heating the parts sufficiently to permit fusion o f the materials when the parts are pressed together. JOINT, WELDED. A gas - tight joint obtained by the joining of metal parts in molten state. LEAK CHECK. An operation performed on a gas piping system to verify that the system does not leak. Leakage checks are intended to discover open outlets, defective appliance connection and defects that have developed since the initial installation, normally performed after pressure testing. LIMIT CONTROL. A device responsive to changes in pressure, temperature or level for turning on, shutting off or throttling the gas supply to an appliance. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 9 LIQUEFIED PETROLEUM GAS or LPG (LP - GAS). Liquefied petroleum gas composed predominately of pro- pane, propylene, buta nes or butylenes, or mixtures thereof that is gaseous under normal atmospheric conditions, but is capable of being liquefied under moderate pressure at normal temperatures. LIVING SPACE. Space within a dwelling unit utilized for living, sleeping, eating, c ooking, bathing, washing and sanitation purposes. LOG LIGHTER. A manually operated solid fuel ignition appliance for installation in a vented solid fuel - burning fireplace. MAIN BURNER. A device or group of devices essentially forming an integral unit for t he final conveyance of gas or a mixture of gas and air to the combustion zone, and in which combustion takes place to accomplish the function for which the appliance is designed. METER. The instrument installed to measure the volume of gas delivered throug h it. NPS. An abbreviation for “Nominal pipe size.” NONCOMBUSTIBLE MATERIALS. Materials that, when tested in accordance with ASTM E 136, have at least three of four specimens tested meeting all of the following criteria: 1. The recorded temperature of the surface and interior thermocouples shall not at any time during the test rise more than 54ºF (12.2ºC) above the furnace temperature at the beginning of the test. 2. There shall not be flaming from the specimen after the first 30 seconds. 3. If the weight l oss of the specimen during testing exceeds 50 percent, the recorded temperature of the surface and interior thermocouples shall not at any time during the test rise above the furnace air temperature at the beginning of the test, and there shall not be flam ing of the specimen. OFFSET (VENT). A combination of approved bends that makes two changes in direction bringing one section of the vent out of line but into a line parallel with the other section. ORIFICE. The opening in a cap, spud or other device whereb y the flow of gas is limited and through which the gas is discharged to the burner. OUTLET. The point at which a gas - fired appliance connects to the gas piping system. OXYGEN DEPLETION SAFETY SHUTOFF SYSTEM (ODS). A system designed to act to shut off the g as sup- ply to the main and pilot burners if the oxygen in the surrounding atmosphere is reduced below a predetermined level. PILOT. A small flame that is utilized to ignite the gas at the main burner or burners. PIPING. Where used in this code, “piping” refers to either pipe or tubing, or both. Pipe. A rigid conduit of iron, steel, copper, brass or plastic. Tubing. Semirigid conduit of copper, aluminum, plastic or steel. PIPING SYSTEM. All fuel piping, valves and fitting s from the outlet of the point of delivery to the outlets of the appliance shutoff valves. PLASTIC, THERMOPLASTIC. A plastic that is capable of being repeatedly softened by increase of temperature and hardened by decrease of temperature. POINT OF DELIVERY. For natural gas systems, the point of delivery is the outlet of the service meter assembly or the outlet of the service regulator or service shutoff valve where a meter is not provided. Where a valve is provided at the outlet of the service meter assembly, such valve shall be considered to be downstream of the point of delivery. PORTABLE FUEL CELL APPLIANCE. A fuel cell generator of electricity, which is not fixed in place. A portable fuel cell appliance utilizes a cord and plug connection to a gr id - isolated load and has an integral fuel supply. PRESSURE DROP. The loss in pressure due to friction or obstruction in pipes, valves, fittings, regulators and burn- ers. 2022 NEW YORK CITY FUEL GAS CODE 2 - 1 ‡‡‡ Chapter 2 was amended by Local Law 77 of 2023 . This law has an effective date of June 10, 2023. CHAPTER 2 DEFINITIONS SECTION FGC 201 GENERAL 201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code and standard, have the meanings indicated in this chapter. 201.2 Inter changeability. Words used in the present tense include the future; words in the masculine gender in- clude the feminine and neuter; the singular number includes the plural and the plural, the singular. 201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the New York City Electrical Code , New York City Building Code , New York City Fire Code , New York City Mechanical Code , New York City Plumbing Code , or the New York City Energy Conservation Code , such terms shall have meanings ascribed to them as in those codes. ‡‡‡ 201.3.1 Terms defined in the general administrative provisions. The following terms are defined in Sec- tion 28 - 101.5 of the Administrative Code : 1968 BUILDING CODE. 1968 OR PRIOR CODE BUILDINGS OR STRUCTURES (PRIOR CODE BUILDINGS). ACCEPTANCE OR ACCEPTED. ADDITION. ADMINISTRATIVE CODE. ALTERATION. APPROVAL OR APPROVED. APPROVED AGENCY. APPROVED FABRICATOR. APPROVED INSPECTION AGENCY. APPROVED TESTING AGENCY. ARCHITECT. BUILDING. CERTIFICATE OF COMPLIANCE. CHARTER. CITY. COMMISSIONER. CONSTRUCTION DOCUMENTS. DAY. DEFERRED SUBMITTAL. DEMOLITION. DEMOLITION, FULL. DEFINITIONS 2 - 2 2022 NEW YORK CITY FUEL GAS CODE DEMOLITION, PARTIAL. DEPARTMENT. ENGINEER. ENLARGEMENT. ENVIRONMENTAL CONTROL BOARD or ECB. EXISTING BUILDING OR STRUCTUR E. FABRICATED ITEM. FIRE PROTECTION PLAN. HEREAFTER. HERETOFORE. INSPECTION CERTIFICATE. INTERIM CERTIFICATE OF OCCUPANCY. LABEL. LABELED. LAND SURVEYOR. LANDSCAPE ARCHITECT. LETTER OF COMPLETION. LIMITED ALTERATION APPLICATION. LIMITED PLUMBING ALTERATIONS. LIMITED SPRINKLER ALTERATIONS. LIMITED STANDPIPE ALTERATIONS. LISTED. MAIN USE OR DOMINANT OCCUPANCY (OF A BUILDING). MANUFACTURER’S DESIGNATION. MARK. MATERIALS. OCCUPANCY. OWNER. PARTY WALL. PERMIT. PERSON. PREMISES. PRIOR CODE BUILDING. PROFESSIONAL CERTIFICATION. PROGRESS INSPECTION. PROJECT. REGISTERED DESIGN PROFESSIONAL. REGISTERED DESIGN PROFESSIONAL OF RECORD. REQUIRED. RETAINING WALL. SERVICE EQUIPMENT. SIGN - OFF. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 3 SINGLE ROOM OCCUPANCY MULTIPLE DWELLING. SPECIAL INSPECTION . SPECIAL INSPECTION AGENCY. SPECIAL INSPECTOR. STRUCTURE. SUBMITTAL DOCUMENTS. SUPERINTENDENT OF CONSTRUCTION (CONSTRUCTION SUPERINTENDENT). USE (USED). UTILITY COMPANY OR PUBLIC UTILITY COMPANY. UTILITY CORPORATION OR PUBLIC UTILITY CORPORATION. WORK NOT CONSTITUTING MINOR ALTERATIONS OR ORDINARY REPAIRS. WRITING (WRITTEN). WRITTEN NOTICE. ZONING RESOLUTION. 201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have ordin arily accepted meanings such as the context implies. ‡‡‡ SECTION FGC 202 GENERAL DEFINITIONS ABNORMAL OPERATING CONDITION. A condition that may indicate a malfunction or a noncompliant com- ponent of a piping system or appliance. ACCESS (TO). That which enables a device, fixture, appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel, door or similar obstruction (see also “Ready access (to) ”). AIR CONDITIONER, GAS - FIRED. A gas - b urning, automatically operated appliance for supplying cooled or dehumidified air or chilled liquid. AIR CONDITIONING. The treatment of air so as to control simultaneously the temperature, humidity, cleanness and distribution of the air to meet the require ments of a conditioned space. AIR, EXHAUST. See “Exhaust.” AIR - HANDLING UNIT. A blower or fan used for the purpose of distributing supply air to a room, space or area. AIR, MAKEUP. Any combination of outdoor and transfer air intended to replace exhaust air and exfiltration. APPLIANCE. Any apparatus or device that utilizes a fuel or raw material to produce light, heat, power, refrigeration or air conditioning. APPLIANCE, AUTOMATICALLY CONTROLLED. Appliances equipped with an automatic b urner ignition and safety shutoff device and other automatic devices which accomplish complete turn - on and shutoff of the gas to the main burner or burners, and graduate the gas supply to the burner or burners, but do not affect complete shutoff of the gas . APPLIANCE TYPE. Low - heat appliance (residential appliance). Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of 1,000 ° F (538 ° C) or less. Medium - heat appliance. Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of more than 1,000 ° F (538 ° C ) or less but not greater than 2,000 ° F ( 1093 .3° C). DEFINITIONS 2 - 4 2022 NEW YORK CITY FUEL GAS CODE APPLIANCE, UNVENTED. An appliance designed or installed in such a manner that the products of combustion are not conveyed by a vent or chimney directly to the outdoor atmosphere. APPLIANCE, VENTED. An appliance designed and installed in such a manner that all of the products o f com- bustion are conveyed directly from the appliance to the outdoor atmosphere through an approved chimney or vent system. See also “VENTED APPLIANCE CATEGORIES.” ATMOSPHERIC PRESSURE. The pressure of the weight of air and water vapor on the surface of th e earth, ap- proximately 14.7 pounds per square inch (psi) (101 kPa absolute) at sea level. BAFFLE. An object placed in an appliance to change the direction of or retard the flow of air, air - gas mixtures or flue gases. BAROMETRIC DRAFT REGULATOR. A balanced damper device attached to a chimney, vent connector, breeching or flue gas manifold to protect combustion appliances by controlling chimney draft. A double - acting barometric draft regulator is one in which the balancing damper is free to move in either direction to protect combustion appliances from both excessive draft and backdraft. BOILER, HIGH - PRESSURE. An appliance for supplying steam or hot water that, for a steam boiler, operates at a pressure of more than 15 psig ( 103.4 kPa gauge), and for a hot water boiler, operates at a pressure exceeding 160 psig ( 1103 kPa gauge) or at a temperature exceeding 250° F ( 121.1 °C). BOILER, LOW - PRESSURE. A self - contained appliance for supplying steam or hot water as follows: Hot water heating boiler. A boiler in which no steam is generated, from which hot water is circulated for heating purposes and then returned to the boiler, and that operates at water pressures not exceeding 160 pounds per square inch gauge (psig) ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Hot water supply boiler. A boiler, completely fill ed with water, which furnishes hot water to be used externally to itself, and that operates at water pressures not exceeding 160 psig ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Steam heating boile r. A boiler in which steam is generated and that operates at a steam pressure not exceeding 15 psig ( 103.4 kPa gauge). BRANCH. A section of gas piping downstream from a riser, leading to appliances or equipment on no more than two consecutive floors. BRAZING. A metal - joining process wherein coalescence is produced by the use of a nonferrous filler metal having a melting point above 1,000°F ( 537.8 ° C), but lower than that of the base metal being joined. The filler material is distributed between the clos ely fitted surfaces of the joint by capillary action. BROILER. A general term including salamanders, barbecues and other appliances cooking primarily by radiated heat, excepting toasters. BTU. Abbreviation for British thermal unit, which is the quantity of heat required to raise the temperature of 1 pound (454 g) of water 1°F ( - 17.2 ° C) (1 Btu = 1055 J). BURNER. A device for the final conveyance of the gas, or a mixture of gas and air, to the combustion zone. Induced draft. A burner that depends on draft induced by a fan that is an integral part of the appliance and is located downstream from the burner. Power. A burner in which gas, air or both are supplied at pressures exceeding, for gas, the line pressure, and for air, atmospheric pressure, with t his added pressure being applied at the burner. CHIMNEY. A primarily vertical structure containing one or more flues used to remove hot gases from burning fuel, refuse, or industrial processes from a fuel - burning appliance to the outdoor atmosphere. Factor y - built chimney. A listed and labeled chimney composed of factory - made components, assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 5 Masonry chimney. A field - constructed chimney composed of solid mason ry units, bricks, stones or concrete. Metal chimney. A field - constructed chimney composed of metal. CLEARANCE. The minimum distance through air measured between the heat - producing surface of the mechanical appliance, device or equipment and the surface of the combustible material or assembly. CLOTHES DRYER. An appliance used to dry wet laundry by means of heated air. Dryer classifications are as follows: Type 1. Factory - built package, multiple production. Primarily used in family living environment. Usually the smallest unit physically and in function output. Type 2. Factory - built package, multiple production. Used in business with direct intercourse of the functi on with the public. Not designed for use in individual family living environment. COMBUSTIBLE ASSEMBLY. Wall, floor, ceiling or other assembly constructed of one or more component mate- rials that are not defined as noncombustible. COMBUSTIBLE MATERIAL. Any material not defined as noncombustible. COMBUSTION. In the context of this code, refers to the rapid oxidation of fuel accompanied by the production of heat or heat and light. COMBUSTION AIR . Air necessary for complete combustion of a fuel, including theor etical air and excess air. COMBUSTION CHAMBER. The portion of an appliance within which combustion occurs. COMBUSTION PRODUCTS. Constituents resulting from the combustion of a fuel with the oxygen of the air, including inert gases, but excluding excess air. CONCEALED LOCATION. A location that cannot be accessed without damaging permanent parts of the building structure or finished surface. Spaces above, below or behind readily removable panels or doors shall not be considered as concealed. CONCEAL ED PIPING. Piping that is located in a concealed location (see “Concealed location ”). CONDENSATE. The liquid that condenses from a gas (including flue gas) caused by a reduction in temperature or increase in pressure. CONNECTOR, APPLIANCE (Fuel). Rigid metallic pipe and fittings or a listed and labeled device that connects an appliance to the gas piping system. CONNECTOR, CHIMNEY OR VENT. The pipe that connects an appliance to a chimney or vent. CONTROL. A manual or automatic device designed to re gulate the gas, air, water or electrical supply to, or operation of, a mechanical system. CONVERSION BURNER. A unit consisting of a burner and its controls for installation in an appliance originally uti- lizing another fuel. COUNTER APPLIANCES. Appliances s uch as coffee brewers and coffee urns and any appurtenant water - heating ap- pliance, food and dish warmers, hot plates, griddles, waffle bakers and other appliances designed for installation on or in a counter. CUBIC FOOT. The amount of gas that occupies 1 c ubic foot (0.02832 m 3 ) when at a temperature of 60°F ( 15.6 ° C), saturated with water vapor and under a pressure equivalent to that of 30 inches of mercury (101 kPa). DAMPER. A manually or automatically controlled device to regulate draft or the rate of flow of air or combustion gases. DECORATIVE APPLIANCE, VENTED. A vented appliance wherein the primary function lies in the aesthetic effect of the flames. DEFINITIONS 2 - 6 2022 NEW YORK CITY FUEL GAS CODE DECORATIVE APPLIANCES FOR INSTALLATION IN VENTED FIREPLACES. A vented appliance de- signed for installa tion within the fire chamber of a vented fireplace, wherein the primary function lies in the aesthetic effect of the flames. DECORATIVE SHROUD. A listed, partial, noncombustible enclosure for aesthetic purposes that is installed at the termination of a ven ting system that surrounds or conceals a factory - built chimney system or vent cap. DEMAND. The maximum amount of gas input required per unit of time, usually expressed in cubic feet per hour (1 ft 3 = 0.0283 m 3 ), or Btu/h (1 Btu/h = 0.2931 W). DILUTION AIR. Air that is introduced into a draft hood and is mixed with the flue gases. DIRECT - VENT APPLIANCES. Appliances that are constructed and installed so that all air for combustion is derived directly from the outdo or atmosphere and all flue gases are discharged directly to the outdoor atmosphere. DRAFT. The pressure difference existing between the appliance or any component part and the atmosphere, that causes a continuous flow of air and products of combustion thro ugh the gas passages of the appliance to the atmos- phere. Induced draft. The pressure difference created by the action of a fan, blower or ejector, that is located between the appliance and the chimney or vent termination. Natural draft. The pressure difference created by a vent or chimney because of its height, and the temperature difference between the flue gases and the atmosphere. DRAFT HOOD. A nonadjustable device built into an appliance, or made as part of the vent connector from an appl iance, that is designed to (1) provide for ready escape of the flue gases from the appliance in the event of no draft, backdraft or stoppage beyond the draft hood, (2) prevent a backdraft from entering the appliance, and (3) neutralize the effect of stack action of the chimney or gas vent upon operation of the appliance. DRAFT REGULATOR. A device that functions to maintain a desired draft in the appliance by automatically reducing the draft to the desired value. DRIP. A nipple and cap placed at a low point in a system of piping to collect condensate and from which the conden- sate is removable. DRY GAS. A gas having a moisture and hydrocarbon dew point below any normal temperature to which the gas piping is exposed. DUCT FURNACE. A warm - air furnace or heater n ormally installed in an air distribution duct to supply warm air for heating. This definition shall apply only to a warm - air heating appliance that, for air circulation, depends on a blower not furnished as part of the furnace. DUCT SYSTEM. A continuous pa ssageway for the transmission of air that, in addition to ducts, includes duct fittings, dampers, plenums, fans and accessory air - handling equipment and appliances . DWELLING. A building or structure which is occupied in whole or in part as the home, residence or sleeping place of one or more families. DWELLING UNIT. A single unit consisting of one or more habitable rooms and occupied or arranged to be occupied as a unit separa te from all other units within a dwelling. EQUIPMENT. Any apparatus or device that delivers gas as a fuel or raw material to an appliance or vents combustion products from an appliance, including but not limited to control devices, pressure regulators, val ves, appliance appurtenances, gas connectors, or power exhausters used in connections to appliances. EXCESS FLOW VALVE (EFV). A safety shut - off valve designed to activate to interrupt the flow of gas when the fuel gas passing through it exceeds a prescribe d flow rate. Installed where specifically required by code or utility company. EXHAUST. Air being removed from any space, appliance or piece of equipment conveyed directly to the atmosphere by means of openings or ducts. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 7 EXTERIOR MASONRY CHIMNEYS. Masonry chimneys exposed to the outdoors on one or more sides below the roof line. FIREPLACE. An assembly consisting of a hearth and fire chamber of noncombustible material and provided with a chimney , for use with solid fuels. Factory - built fireplace. A listed and labeled fireplace and chimney system composed of factory - made compo- nents , and assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. Masonry fireplace. A hearth and fire chamber of s olid masonry units such as bricks, stones, listed masonry units or reinforced concrete, provided with a suitable chimney. FLAME SAFEGUARD. A device that will automatically shut off the fuel supply to a main burner or group of burners when the means of igni tion of such burners becomes inoperative, and when flame failure occurs on the burner or group of burners. FLASHBACK ARRESTOR CHECK VALVE. A device that will prevent the backflow of one gas into the supply system of another gas and prevent the passage of flame into the gas supply system. FLOOR FURNACE. A completely self - contained furnace suspended from the floor of the space being heated, ta king air for combustion from outside such space and with means for observing flames and lighting the appliance from such space. Fan type. A floor furnace equipped with a fan that provides the primary means for circulating air. Gravity type. A floor furnace depending primarily on circulation of air by gravity. This classification shall also include floor furnaces equipped with booster - type fans that do not materially restrict free circulation of air by gravity flow when such fans are not in operation. FLUE. A passageway within a chimney or vent through which gaseous combustion products pass. FLUE, APPLIANCE. The passage(s) within an appliance through which combustion products pass from the combustion chamber of the appliance to the draft hood inlet opening on an appliance equipped with a draft hood or to the outlet of the appliance on an appliance not equipped with a draft hood. FLUE COLLAR. That portion of an appliance designed for the attachment of a draft hood, vent connector or venting system. FL UE GASES. Products of combustion plus excess air in fireplace and appliance flues or heat exchangers. FLUE LINER (LINING). A system or material used to form the inside surface of a flue in a chimney or vent, for the purpose of protecting the surrounding st ructure from the effects of combustion products and for conveying combustion products without leakage into the atmosphere. FUEL GAS. A natural gas, manufactured gas, liquefied petroleum gas or mixtures of these gases. FURNACE. A completely self - contained h eating unit that is designed to supply heated air to spaces remote from or adjacent to the appliance location. FURNACE, CENTRAL. A self - contained appliance for heating air by transfer of heat of combustion through metal to the air, and designed to supply h eated air through ducts to spaces remote from or adjacent to the appliance location. Forced - air type. A central furnace equipped with a fan or blower that provides the primary means for circulation of air. FURNACE PLENUM. An air compartment or chamber to which one or more ducts are connected and that forms part of an air distribution system. GAS CONVENIENCE OUTLET. A permanently mounted, manually operated device that provides the means for connecting an appliance to, and d isconnecting an appliance from, the supply piping. The device includes an integral, manually operated valve with a nondisplaceable valve member and is designed so that disconnection of an appliance only occurs when the manually operated valve is in the clo sed position. DEFINITIONS 2 - 8 2022 NEW YORK CITY FUEL GAS CODE GAS PIPING. An installation of pipe, valves or fittings installed on a premises or in a building and utilized to convey fuel gas. GAS UTILIZATION EQUIPMENT. An appliance that utilizes gas as a fuel or raw material or both. HAZARDOUS LOCATION. Any location considered to be a fire hazard for flammable vapors, dust, combustible fibers or other highly combustible substances. The location is not necessarily categorized in the New York City Building Code as a high - hazard group classification. HOUSE PIPING. See “Piping system.” HYDROGEN FUEL GAS ROOM. A separately ventilated, fully enclosed room designed to exclusively house the generation of gaseous hydrogen for immediate on - premises use in indoor fuel cells or other energy production process, and incidental indoor storage of gaseous hydrogen. A hydro gen fuel gas room is not intended to house the production or dispensing of hydrogen motor fuel. IGNITION SOURCE. A flame, spark or hot surface capable of igniting flammable vapors or fumes. Such sources include appliance burners, burner ignitors, and elect rical switching devices. INCINERATOR. An appliance used to reduce combustible refuse material to ashes and that is manufactured, sold and installed as a complete unit. INDUSTRIAL AIR HEATERS, NONRECIRCULATING DIRECT - FIRED . A heater in which all the product s of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating only outdoor air. INDUSTRIAL AIR HEATERS, RECIRCULATING DIRECT - FIRED . A heater in which all the pro ducts of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating outdoor air, and, if applicable, indoor air. INFRARED RADIANT HEATER. A heater that directs a s ubstantial amount of its energy output in the form of infrared radiant energy into the area to be heated. Such heaters are of either the vented or unvented type. INTEGRAL VENT APPLIANCES. Appliances designed for outdoor installation that have built - in natu ral or me- chanical venting means and are constructed and installed so that all air for combustion is derived from the outdoor atmosphere and all flue gases are discharged to the outdoor atmosphere through an integral vent termination. INTERLOCK. A device actuated by another device with which it is directly associated, to govern succeeding oper- ations of the same or allied devices. A circuit in which a given action cannot occur until after one or more other actions have taken place. JOINT, FLANGED. A joint made by bolting together a pair of flanged ends. JOINT, FLARED. A metal - to - metal compression joint in which a conical spread is made on the end of a tube that is compressed by a flare nut against a mating flare. JOINT, MECHANICAL. A general form o f gas - tight joints obtained by the joining of metal parts through a positive - holding mechanical construction, such as press joint, flanged joint, threaded joint, flared joint or compression joint. JOINT, PLASTIC ADHESIVE. A joint made in thermoset plastic piping by the use of an adhesive substance that forms a continuous bond between the mating surfaces without dissolving either one of them. JOINT, PLASTIC HEAT FUSION. A joint made in thermoplastic piping by heating the parts sufficiently to permit fusion o f the materials when the parts are pressed together. JOINT, WELDED. A gas - tight joint obtained by the joining of metal parts in molten state. LEAK CHECK. An operation performed on a gas piping system to verify that the system does not leak. Leakage checks are intended to discover open outlets, defective appliance connection and defects that have developed since the initial installation, normally performed after pressure testing. LIMIT CONTROL. A device responsive to changes in pressure, temperature or level for turning on, shutting off or throttling the gas supply to an appliance. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 9 LIQUEFIED PETROLEUM GAS or LPG (LP - GAS). Liquefied petroleum gas composed predominately of pro- pane, propylene, buta nes or butylenes, or mixtures thereof that is gaseous under normal atmospheric conditions, but is capable of being liquefied under moderate pressure at normal temperatures. LIVING SPACE. Space within a dwelling unit utilized for living, sleeping, eating, c ooking, bathing, washing and sanitation purposes. LOG LIGHTER. A manually operated solid fuel ignition appliance for installation in a vented solid fuel - burning fireplace. MAIN BURNER. A device or group of devices essentially forming an integral unit for t he final conveyance of gas or a mixture of gas and air to the combustion zone, and in which combustion takes place to accomplish the function for which the appliance is designed. METER. The instrument installed to measure the volume of gas delivered throug h it. NPS. An abbreviation for “Nominal pipe size.” NONCOMBUSTIBLE MATERIALS. Materials that, when tested in accordance with ASTM E 136, have at least three of four specimens tested meeting all of the following criteria: 1. The recorded temperature of the surface and interior thermocouples shall not at any time during the test rise more than 54ºF (12.2ºC) above the furnace temperature at the beginning of the test. 2. There shall not be flaming from the specimen after the first 30 seconds. 3. If the weight l oss of the specimen during testing exceeds 50 percent, the recorded temperature of the surface and interior thermocouples shall not at any time during the test rise above the furnace air temperature at the beginning of the test, and there shall not be flam ing of the specimen. OFFSET (VENT). A combination of approved bends that makes two changes in direction bringing one section of the vent out of line but into a line parallel with the other section. ORIFICE. The opening in a cap, spud or other device whereb y the flow of gas is limited and through which the gas is discharged to the burner. OUTLET. The point at which a gas - fired appliance connects to the gas piping system. OXYGEN DEPLETION SAFETY SHUTOFF SYSTEM (ODS). A system designed to act to shut off the g as sup- ply to the main and pilot burners if the oxygen in the surrounding atmosphere is reduced below a predetermined level. PILOT. A small flame that is utilized to ignite the gas at the main burner or burners. PIPING. Where used in this code, “piping” refers to either pipe or tubing, or both. Pipe. A rigid conduit of iron, steel, copper, brass or plastic. Tubing. Semirigid conduit of copper, aluminum, plastic or steel. PIPING SYSTEM. All fuel piping, valves and fitting s from the outlet of the point of delivery to the outlets of the appliance shutoff valves. PLASTIC, THERMOPLASTIC. A plastic that is capable of being repeatedly softened by increase of temperature and hardened by decrease of temperature. POINT OF DELIVERY. For natural gas systems, the point of delivery is the outlet of the service meter assembly or the outlet of the service regulator or service shutoff valve where a meter is not provided. Where a valve is provided at the outlet of the service meter assembly, such valve shall be considered to be downstream of the point of delivery. PORTABLE FUEL CELL APPLIANCE. A fuel cell generator of electricity, which is not fixed in place. A portable fuel cell appliance utilizes a cord and plug connection to a gr id - isolated load and has an integral fuel supply. PRESSURE DROP. The loss in pressure due to friction or obstruction in pipes, valves, fittings, regulators and burn- ers. DEFINITIONS 2 - 10 2022 NEW YORK CITY FUEL GAS CODE PRESSURE TEST. An operation performed to verify the gas - tight integrity of gas piping f ollowing its installation or modification. PURGE. To free a gas conduit of air or gas, or a mixture of gas and air. QUICK - DISCONNECT DEVICE. A hand - operated device that provides a means for connecting and disconnecting an appliance or an appliance connecto r to a gas supply and that is equipped with an automatic means to shut off the gas supply when the device is disconnected. READY ACCESS (TO). That which enables a device, fixture, appliance or equipment to be directly reached, without requiring the removal or movement of any panel, door or similar obstruction (see “Access (to) ”). REGULATOR. A device for controlling and maintaining a uniform supply pressure, either pounds - to - inches water column (MP regulator) or inches - to - inches water column (appliance regulator). REGULATOR, GAS APPLIANCE. A pressure regulator for controlling pressure to the manifold of the appliance. Types of appliance regulators are as follows: Adjustable. 1. Spring type, limited adjustment. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, the loading of which is adjus table over a range of not more than 15 percent of the outlet pressure at the midpoint of the adjustment range. 2. Spring type, standard adjustment. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, th e loading of which is adjustable. The adjustment means shall be con- cealed. Multistage. A regulator for use with a single gas whose adjustment means is capable of being positioned manually or automatically to two or more predetermined outlet pressure settin gs. Each of these settings shall be adjustable or nonadjustable. The regulator may modulate outlet pressures automatically between its maximum and minimum predetermined outlet pressure settings. Nonadjustable. 1. Spring type, nonadjustable. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, the loading of which is not field adjustable. 2. Weight type. A regulator in which the regulating force acting upon the diaphragm is derived from a weight or combina tion of weights. REGULATOR, LINE GAS PRESSURE. A device placed in a gas line between the service pressure regulator and the appliance for controlling, maintaining or reducing the pressure in that portion of the piping system downstream of the device. REGUL ATOR, MEDIUM - PRESSURE (MP Regulator). A line pressure regulator that reduces gas pressure from the range of greater than 0.5 psig (3.4 kPa) and less than or equal to 5 psig (34.5 kPa) to a lower pressure. REGULATOR, PRESSURE. A device placed in a gas line for reducing, controlling and maintaining the pressure in that portion of the piping system downstream of the device. REGULATOR, SERVICE PRESSURE. A device installed by the serving gas supplier to reduce and limit the ser- vice line pressure to delivery pres sure. RELIEF OPENING. The opening provided in a draft hood to permit the ready escape to the atmosphere of the flue products from the draft hood in the event of no draft, back draft or stoppage beyond the draft hood, and to permit air into the draft hood i n the event of a strong chimney updraft. RELIEF VALVE (DEVICE). A safety valve designed to forestall the development of a dangerous condition by relieving either pressure, temperature or vacuum . RELIEF VALVE, PRESSURE. An automatic valve that opens and clo ses a relief vent, depending on whether the pressure is above or below a predetermined value. 2022 NEW YORK CITY FUEL GAS CODE 2 - 1 ‡‡‡ Chapter 2 was amended by Local Law 77 of 2023 . This law has an effective date of June 10, 2023. CHAPTER 2 DEFINITIONS SECTION FGC 201 GENERAL 201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code and standard, have the meanings indicated in this chapter. 201.2 Inter changeability. Words used in the present tense include the future; words in the masculine gender in- clude the feminine and neuter; the singular number includes the plural and the plural, the singular. 201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the New York City Electrical Code , New York City Building Code , New York City Fire Code , New York City Mechanical Code , New York City Plumbing Code , or the New York City Energy Conservation Code , such terms shall have meanings ascribed to them as in those codes. ‡‡‡ 201.3.1 Terms defined in the general administrative provisions. The following terms are defined in Sec- tion 28 - 101.5 of the Administrative Code : 1968 BUILDING CODE. 1968 OR PRIOR CODE BUILDINGS OR STRUCTURES (PRIOR CODE BUILDINGS). ACCEPTANCE OR ACCEPTED. ADDITION. ADMINISTRATIVE CODE. ALTERATION. APPROVAL OR APPROVED. APPROVED AGENCY. APPROVED FABRICATOR. APPROVED INSPECTION AGENCY. APPROVED TESTING AGENCY. ARCHITECT. BUILDING. CERTIFICATE OF COMPLIANCE. CHARTER. CITY. COMMISSIONER. CONSTRUCTION DOCUMENTS. DAY. DEFERRED SUBMITTAL. DEMOLITION. DEMOLITION, FULL. DEFINITIONS 2 - 2 2022 NEW YORK CITY FUEL GAS CODE DEMOLITION, PARTIAL. DEPARTMENT. ENGINEER. ENLARGEMENT. ENVIRONMENTAL CONTROL BOARD or ECB. EXISTING BUILDING OR STRUCTUR E. FABRICATED ITEM. FIRE PROTECTION PLAN. HEREAFTER. HERETOFORE. INSPECTION CERTIFICATE. INTERIM CERTIFICATE OF OCCUPANCY. LABEL. LABELED. LAND SURVEYOR. LANDSCAPE ARCHITECT. LETTER OF COMPLETION. LIMITED ALTERATION APPLICATION. LIMITED PLUMBING ALTERATIONS. LIMITED SPRINKLER ALTERATIONS. LIMITED STANDPIPE ALTERATIONS. LISTED. MAIN USE OR DOMINANT OCCUPANCY (OF A BUILDING). MANUFACTURER’S DESIGNATION. MARK. MATERIALS. OCCUPANCY. OWNER. PARTY WALL. PERMIT. PERSON. PREMISES. PRIOR CODE BUILDING. PROFESSIONAL CERTIFICATION. PROGRESS INSPECTION. PROJECT. REGISTERED DESIGN PROFESSIONAL. REGISTERED DESIGN PROFESSIONAL OF RECORD. REQUIRED. RETAINING WALL. SERVICE EQUIPMENT. SIGN - OFF. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 3 SINGLE ROOM OCCUPANCY MULTIPLE DWELLING. SPECIAL INSPECTION . SPECIAL INSPECTION AGENCY. SPECIAL INSPECTOR. STRUCTURE. SUBMITTAL DOCUMENTS. SUPERINTENDENT OF CONSTRUCTION (CONSTRUCTION SUPERINTENDENT). USE (USED). UTILITY COMPANY OR PUBLIC UTILITY COMPANY. UTILITY CORPORATION OR PUBLIC UTILITY CORPORATION. WORK NOT CONSTITUTING MINOR ALTERATIONS OR ORDINARY REPAIRS. WRITING (WRITTEN). WRITTEN NOTICE. ZONING RESOLUTION. 201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have ordin arily accepted meanings such as the context implies. ‡‡‡ SECTION FGC 202 GENERAL DEFINITIONS ABNORMAL OPERATING CONDITION. A condition that may indicate a malfunction or a noncompliant com- ponent of a piping system or appliance. ACCESS (TO). That which enables a device, fixture, appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel, door or similar obstruction (see also “Ready access (to) ”). AIR CONDITIONER, GAS - FIRED. A gas - b urning, automatically operated appliance for supplying cooled or dehumidified air or chilled liquid. AIR CONDITIONING. The treatment of air so as to control simultaneously the temperature, humidity, cleanness and distribution of the air to meet the require ments of a conditioned space. AIR, EXHAUST. See “Exhaust.” AIR - HANDLING UNIT. A blower or fan used for the purpose of distributing supply air to a room, space or area. AIR, MAKEUP. Any combination of outdoor and transfer air intended to replace exhaust air and exfiltration. APPLIANCE. Any apparatus or device that utilizes a fuel or raw material to produce light, heat, power, refrigeration or air conditioning. APPLIANCE, AUTOMATICALLY CONTROLLED. Appliances equipped with an automatic b urner ignition and safety shutoff device and other automatic devices which accomplish complete turn - on and shutoff of the gas to the main burner or burners, and graduate the gas supply to the burner or burners, but do not affect complete shutoff of the gas . APPLIANCE TYPE. Low - heat appliance (residential appliance). Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of 1,000 ° F (538 ° C) or less. Medium - heat appliance. Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of more than 1,000 ° F (538 ° C ) or less but not greater than 2,000 ° F ( 1093 .3° C). DEFINITIONS 2 - 4 2022 NEW YORK CITY FUEL GAS CODE APPLIANCE, UNVENTED. An appliance designed or installed in such a manner that the products of combustion are not conveyed by a vent or chimney directly to the outdoor atmosphere. APPLIANCE, VENTED. An appliance designed and installed in such a manner that all of the products o f com- bustion are conveyed directly from the appliance to the outdoor atmosphere through an approved chimney or vent system. See also “VENTED APPLIANCE CATEGORIES.” ATMOSPHERIC PRESSURE. The pressure of the weight of air and water vapor on the surface of th e earth, ap- proximately 14.7 pounds per square inch (psi) (101 kPa absolute) at sea level. BAFFLE. An object placed in an appliance to change the direction of or retard the flow of air, air - gas mixtures or flue gases. BAROMETRIC DRAFT REGULATOR. A balanced damper device attached to a chimney, vent connector, breeching or flue gas manifold to protect combustion appliances by controlling chimney draft. A double - acting barometric draft regulator is one in which the balancing damper is free to move in either direction to protect combustion appliances from both excessive draft and backdraft. BOILER, HIGH - PRESSURE. An appliance for supplying steam or hot water that, for a steam boiler, operates at a pressure of more than 15 psig ( 103.4 kPa gauge), and for a hot water boiler, operates at a pressure exceeding 160 psig ( 1103 kPa gauge) or at a temperature exceeding 250° F ( 121.1 °C). BOILER, LOW - PRESSURE. A self - contained appliance for supplying steam or hot water as follows: Hot water heating boiler. A boiler in which no steam is generated, from which hot water is circulated for heating purposes and then returned to the boiler, and that operates at water pressures not exceeding 160 pounds per square inch gauge (psig) ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Hot water supply boiler. A boiler, completely fill ed with water, which furnishes hot water to be used externally to itself, and that operates at water pressures not exceeding 160 psig ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Steam heating boile r. A boiler in which steam is generated and that operates at a steam pressure not exceeding 15 psig ( 103.4 kPa gauge). BRANCH. A section of gas piping downstream from a riser, leading to appliances or equipment on no more than two consecutive floors. BRAZING. A metal - joining process wherein coalescence is produced by the use of a nonferrous filler metal having a melting point above 1,000°F ( 537.8 ° C), but lower than that of the base metal being joined. The filler material is distributed between the clos ely fitted surfaces of the joint by capillary action. BROILER. A general term including salamanders, barbecues and other appliances cooking primarily by radiated heat, excepting toasters. BTU. Abbreviation for British thermal unit, which is the quantity of heat required to raise the temperature of 1 pound (454 g) of water 1°F ( - 17.2 ° C) (1 Btu = 1055 J). BURNER. A device for the final conveyance of the gas, or a mixture of gas and air, to the combustion zone. Induced draft. A burner that depends on draft induced by a fan that is an integral part of the appliance and is located downstream from the burner. Power. A burner in which gas, air or both are supplied at pressures exceeding, for gas, the line pressure, and for air, atmospheric pressure, with t his added pressure being applied at the burner. CHIMNEY. A primarily vertical structure containing one or more flues used to remove hot gases from burning fuel, refuse, or industrial processes from a fuel - burning appliance to the outdoor atmosphere. Factor y - built chimney. A listed and labeled chimney composed of factory - made components, assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 5 Masonry chimney. A field - constructed chimney composed of solid mason ry units, bricks, stones or concrete. Metal chimney. A field - constructed chimney composed of metal. CLEARANCE. The minimum distance through air measured between the heat - producing surface of the mechanical appliance, device or equipment and the surface of the combustible material or assembly. CLOTHES DRYER. An appliance used to dry wet laundry by means of heated air. Dryer classifications are as follows: Type 1. Factory - built package, multiple production. Primarily used in family living environment. Usually the smallest unit physically and in function output. Type 2. Factory - built package, multiple production. Used in business with direct intercourse of the functi on with the public. Not designed for use in individual family living environment. COMBUSTIBLE ASSEMBLY. Wall, floor, ceiling or other assembly constructed of one or more component mate- rials that are not defined as noncombustible. COMBUSTIBLE MATERIAL. Any material not defined as noncombustible. COMBUSTION. In the context of this code, refers to the rapid oxidation of fuel accompanied by the production of heat or heat and light. COMBUSTION AIR . Air necessary for complete combustion of a fuel, including theor etical air and excess air. COMBUSTION CHAMBER. The portion of an appliance within which combustion occurs. COMBUSTION PRODUCTS. Constituents resulting from the combustion of a fuel with the oxygen of the air, including inert gases, but excluding excess air. CONCEALED LOCATION. A location that cannot be accessed without damaging permanent parts of the building structure or finished surface. Spaces above, below or behind readily removable panels or doors shall not be considered as concealed. CONCEAL ED PIPING. Piping that is located in a concealed location (see “Concealed location ”). CONDENSATE. The liquid that condenses from a gas (including flue gas) caused by a reduction in temperature or increase in pressure. CONNECTOR, APPLIANCE (Fuel). Rigid metallic pipe and fittings or a listed and labeled device that connects an appliance to the gas piping system. CONNECTOR, CHIMNEY OR VENT. The pipe that connects an appliance to a chimney or vent. CONTROL. A manual or automatic device designed to re gulate the gas, air, water or electrical supply to, or operation of, a mechanical system. CONVERSION BURNER. A unit consisting of a burner and its controls for installation in an appliance originally uti- lizing another fuel. COUNTER APPLIANCES. Appliances s uch as coffee brewers and coffee urns and any appurtenant water - heating ap- pliance, food and dish warmers, hot plates, griddles, waffle bakers and other appliances designed for installation on or in a counter. CUBIC FOOT. The amount of gas that occupies 1 c ubic foot (0.02832 m 3 ) when at a temperature of 60°F ( 15.6 ° C), saturated with water vapor and under a pressure equivalent to that of 30 inches of mercury (101 kPa). DAMPER. A manually or automatically controlled device to regulate draft or the rate of flow of air or combustion gases. DECORATIVE APPLIANCE, VENTED. A vented appliance wherein the primary function lies in the aesthetic effect of the flames. DEFINITIONS 2 - 6 2022 NEW YORK CITY FUEL GAS CODE DECORATIVE APPLIANCES FOR INSTALLATION IN VENTED FIREPLACES. A vented appliance de- signed for installa tion within the fire chamber of a vented fireplace, wherein the primary function lies in the aesthetic effect of the flames. DECORATIVE SHROUD. A listed, partial, noncombustible enclosure for aesthetic purposes that is installed at the termination of a ven ting system that surrounds or conceals a factory - built chimney system or vent cap. DEMAND. The maximum amount of gas input required per unit of time, usually expressed in cubic feet per hour (1 ft 3 = 0.0283 m 3 ), or Btu/h (1 Btu/h = 0.2931 W). DILUTION AIR. Air that is introduced into a draft hood and is mixed with the flue gases. DIRECT - VENT APPLIANCES. Appliances that are constructed and installed so that all air for combustion is derived directly from the outdo or atmosphere and all flue gases are discharged directly to the outdoor atmosphere. DRAFT. The pressure difference existing between the appliance or any component part and the atmosphere, that causes a continuous flow of air and products of combustion thro ugh the gas passages of the appliance to the atmos- phere. Induced draft. The pressure difference created by the action of a fan, blower or ejector, that is located between the appliance and the chimney or vent termination. Natural draft. The pressure difference created by a vent or chimney because of its height, and the temperature difference between the flue gases and the atmosphere. DRAFT HOOD. A nonadjustable device built into an appliance, or made as part of the vent connector from an appl iance, that is designed to (1) provide for ready escape of the flue gases from the appliance in the event of no draft, backdraft or stoppage beyond the draft hood, (2) prevent a backdraft from entering the appliance, and (3) neutralize the effect of stack action of the chimney or gas vent upon operation of the appliance. DRAFT REGULATOR. A device that functions to maintain a desired draft in the appliance by automatically reducing the draft to the desired value. DRIP. A nipple and cap placed at a low point in a system of piping to collect condensate and from which the conden- sate is removable. DRY GAS. A gas having a moisture and hydrocarbon dew point below any normal temperature to which the gas piping is exposed. DUCT FURNACE. A warm - air furnace or heater n ormally installed in an air distribution duct to supply warm air for heating. This definition shall apply only to a warm - air heating appliance that, for air circulation, depends on a blower not furnished as part of the furnace. DUCT SYSTEM. A continuous pa ssageway for the transmission of air that, in addition to ducts, includes duct fittings, dampers, plenums, fans and accessory air - handling equipment and appliances . DWELLING. A building or structure which is occupied in whole or in part as the home, residence or sleeping place of one or more families. DWELLING UNIT. A single unit consisting of one or more habitable rooms and occupied or arranged to be occupied as a unit separa te from all other units within a dwelling. EQUIPMENT. Any apparatus or device that delivers gas as a fuel or raw material to an appliance or vents combustion products from an appliance, including but not limited to control devices, pressure regulators, val ves, appliance appurtenances, gas connectors, or power exhausters used in connections to appliances. EXCESS FLOW VALVE (EFV). A safety shut - off valve designed to activate to interrupt the flow of gas when the fuel gas passing through it exceeds a prescribe d flow rate. Installed where specifically required by code or utility company. EXHAUST. Air being removed from any space, appliance or piece of equipment conveyed directly to the atmosphere by means of openings or ducts. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 7 EXTERIOR MASONRY CHIMNEYS. Masonry chimneys exposed to the outdoors on one or more sides below the roof line. FIREPLACE. An assembly consisting of a hearth and fire chamber of noncombustible material and provided with a chimney , for use with solid fuels. Factory - built fireplace. A listed and labeled fireplace and chimney system composed of factory - made compo- nents , and assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. Masonry fireplace. A hearth and fire chamber of s olid masonry units such as bricks, stones, listed masonry units or reinforced concrete, provided with a suitable chimney. FLAME SAFEGUARD. A device that will automatically shut off the fuel supply to a main burner or group of burners when the means of igni tion of such burners becomes inoperative, and when flame failure occurs on the burner or group of burners. FLASHBACK ARRESTOR CHECK VALVE. A device that will prevent the backflow of one gas into the supply system of another gas and prevent the passage of flame into the gas supply system. FLOOR FURNACE. A completely self - contained furnace suspended from the floor of the space being heated, ta king air for combustion from outside such space and with means for observing flames and lighting the appliance from such space. Fan type. A floor furnace equipped with a fan that provides the primary means for circulating air. Gravity type. A floor furnace depending primarily on circulation of air by gravity. This classification shall also include floor furnaces equipped with booster - type fans that do not materially restrict free circulation of air by gravity flow when such fans are not in operation. FLUE. A passageway within a chimney or vent through which gaseous combustion products pass. FLUE, APPLIANCE. The passage(s) within an appliance through which combustion products pass from the combustion chamber of the appliance to the draft hood inlet opening on an appliance equipped with a draft hood or to the outlet of the appliance on an appliance not equipped with a draft hood. FLUE COLLAR. That portion of an appliance designed for the attachment of a draft hood, vent connector or venting system. FL UE GASES. Products of combustion plus excess air in fireplace and appliance flues or heat exchangers. FLUE LINER (LINING). A system or material used to form the inside surface of a flue in a chimney or vent, for the purpose of protecting the surrounding st ructure from the effects of combustion products and for conveying combustion products without leakage into the atmosphere. FUEL GAS. A natural gas, manufactured gas, liquefied petroleum gas or mixtures of these gases. FURNACE. A completely self - contained h eating unit that is designed to supply heated air to spaces remote from or adjacent to the appliance location. FURNACE, CENTRAL. A self - contained appliance for heating air by transfer of heat of combustion through metal to the air, and designed to supply h eated air through ducts to spaces remote from or adjacent to the appliance location. Forced - air type. A central furnace equipped with a fan or blower that provides the primary means for circulation of air. FURNACE PLENUM. An air compartment or chamber to which one or more ducts are connected and that forms part of an air distribution system. GAS CONVENIENCE OUTLET. A permanently mounted, manually operated device that provides the means for connecting an appliance to, and d isconnecting an appliance from, the supply piping. The device includes an integral, manually operated valve with a nondisplaceable valve member and is designed so that disconnection of an appliance only occurs when the manually operated valve is in the clo sed position. DEFINITIONS 2 - 8 2022 NEW YORK CITY FUEL GAS CODE GAS PIPING. An installation of pipe, valves or fittings installed on a premises or in a building and utilized to convey fuel gas. GAS UTILIZATION EQUIPMENT. An appliance that utilizes gas as a fuel or raw material or both. HAZARDOUS LOCATION. Any location considered to be a fire hazard for flammable vapors, dust, combustible fibers or other highly combustible substances. The location is not necessarily categorized in the New York City Building Code as a high - hazard group classification. HOUSE PIPING. See “Piping system.” HYDROGEN FUEL GAS ROOM. A separately ventilated, fully enclosed room designed to exclusively house the generation of gaseous hydrogen for immediate on - premises use in indoor fuel cells or other energy production process, and incidental indoor storage of gaseous hydrogen. A hydro gen fuel gas room is not intended to house the production or dispensing of hydrogen motor fuel. IGNITION SOURCE. A flame, spark or hot surface capable of igniting flammable vapors or fumes. Such sources include appliance burners, burner ignitors, and elect rical switching devices. INCINERATOR. An appliance used to reduce combustible refuse material to ashes and that is manufactured, sold and installed as a complete unit. INDUSTRIAL AIR HEATERS, NONRECIRCULATING DIRECT - FIRED . A heater in which all the product s of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating only outdoor air. INDUSTRIAL AIR HEATERS, RECIRCULATING DIRECT - FIRED . A heater in which all the pro ducts of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating outdoor air, and, if applicable, indoor air. INFRARED RADIANT HEATER. A heater that directs a s ubstantial amount of its energy output in the form of infrared radiant energy into the area to be heated. Such heaters are of either the vented or unvented type. INTEGRAL VENT APPLIANCES. Appliances designed for outdoor installation that have built - in natu ral or me- chanical venting means and are constructed and installed so that all air for combustion is derived from the outdoor atmosphere and all flue gases are discharged to the outdoor atmosphere through an integral vent termination. INTERLOCK. A device actuated by another device with which it is directly associated, to govern succeeding oper- ations of the same or allied devices. A circuit in which a given action cannot occur until after one or more other actions have taken place. JOINT, FLANGED. A joint made by bolting together a pair of flanged ends. JOINT, FLARED. A metal - to - metal compression joint in which a conical spread is made on the end of a tube that is compressed by a flare nut against a mating flare. JOINT, MECHANICAL. A general form o f gas - tight joints obtained by the joining of metal parts through a positive - holding mechanical construction, such as press joint, flanged joint, threaded joint, flared joint or compression joint. JOINT, PLASTIC ADHESIVE. A joint made in thermoset plastic piping by the use of an adhesive substance that forms a continuous bond between the mating surfaces without dissolving either one of them. JOINT, PLASTIC HEAT FUSION. A joint made in thermoplastic piping by heating the parts sufficiently to permit fusion o f the materials when the parts are pressed together. JOINT, WELDED. A gas - tight joint obtained by the joining of metal parts in molten state. LEAK CHECK. An operation performed on a gas piping system to verify that the system does not leak. Leakage checks are intended to discover open outlets, defective appliance connection and defects that have developed since the initial installation, normally performed after pressure testing. LIMIT CONTROL. A device responsive to changes in pressure, temperature or level for turning on, shutting off or throttling the gas supply to an appliance. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 9 LIQUEFIED PETROLEUM GAS or LPG (LP - GAS). Liquefied petroleum gas composed predominately of pro- pane, propylene, buta nes or butylenes, or mixtures thereof that is gaseous under normal atmospheric conditions, but is capable of being liquefied under moderate pressure at normal temperatures. LIVING SPACE. Space within a dwelling unit utilized for living, sleeping, eating, c ooking, bathing, washing and sanitation purposes. LOG LIGHTER. A manually operated solid fuel ignition appliance for installation in a vented solid fuel - burning fireplace. MAIN BURNER. A device or group of devices essentially forming an integral unit for t he final conveyance of gas or a mixture of gas and air to the combustion zone, and in which combustion takes place to accomplish the function for which the appliance is designed. METER. The instrument installed to measure the volume of gas delivered throug h it. NPS. An abbreviation for “Nominal pipe size.” NONCOMBUSTIBLE MATERIALS. Materials that, when tested in accordance with ASTM E 136, have at least three of four specimens tested meeting all of the following criteria: 1. The recorded temperature of the surface and interior thermocouples shall not at any time during the test rise more than 54ºF (12.2ºC) above the furnace temperature at the beginning of the test. 2. There shall not be flaming from the specimen after the first 30 seconds. 3. If the weight l oss of the specimen during testing exceeds 50 percent, the recorded temperature of the surface and interior thermocouples shall not at any time during the test rise above the furnace air temperature at the beginning of the test, and there shall not be flam ing of the specimen. OFFSET (VENT). A combination of approved bends that makes two changes in direction bringing one section of the vent out of line but into a line parallel with the other section. ORIFICE. The opening in a cap, spud or other device whereb y the flow of gas is limited and through which the gas is discharged to the burner. OUTLET. The point at which a gas - fired appliance connects to the gas piping system. OXYGEN DEPLETION SAFETY SHUTOFF SYSTEM (ODS). A system designed to act to shut off the g as sup- ply to the main and pilot burners if the oxygen in the surrounding atmosphere is reduced below a predetermined level. PILOT. A small flame that is utilized to ignite the gas at the main burner or burners. PIPING. Where used in this code, “piping” refers to either pipe or tubing, or both. Pipe. A rigid conduit of iron, steel, copper, brass or plastic. Tubing. Semirigid conduit of copper, aluminum, plastic or steel. PIPING SYSTEM. All fuel piping, valves and fitting s from the outlet of the point of delivery to the outlets of the appliance shutoff valves. PLASTIC, THERMOPLASTIC. A plastic that is capable of being repeatedly softened by increase of temperature and hardened by decrease of temperature. POINT OF DELIVERY. For natural gas systems, the point of delivery is the outlet of the service meter assembly or the outlet of the service regulator or service shutoff valve where a meter is not provided. Where a valve is provided at the outlet of the service meter assembly, such valve shall be considered to be downstream of the point of delivery. PORTABLE FUEL CELL APPLIANCE. A fuel cell generator of electricity, which is not fixed in place. A portable fuel cell appliance utilizes a cord and plug connection to a gr id - isolated load and has an integral fuel supply. PRESSURE DROP. The loss in pressure due to friction or obstruction in pipes, valves, fittings, regulators and burn- ers. DEFINITIONS 2 - 10 2022 NEW YORK CITY FUEL GAS CODE PRESSURE TEST. An operation performed to verify the gas - tight integrity of gas piping f ollowing its installation or modification. PURGE. To free a gas conduit of air or gas, or a mixture of gas and air. QUICK - DISCONNECT DEVICE. A hand - operated device that provides a means for connecting and disconnecting an appliance or an appliance connecto r to a gas supply and that is equipped with an automatic means to shut off the gas supply when the device is disconnected. READY ACCESS (TO). That which enables a device, fixture, appliance or equipment to be directly reached, without requiring the removal or movement of any panel, door or similar obstruction (see “Access (to) ”). REGULATOR. A device for controlling and maintaining a uniform supply pressure, either pounds - to - inches water column (MP regulator) or inches - to - inches water column (appliance regulator). REGULATOR, GAS APPLIANCE. A pressure regulator for controlling pressure to the manifold of the appliance. Types of appliance regulators are as follows: Adjustable. 1. Spring type, limited adjustment. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, the loading of which is adjus table over a range of not more than 15 percent of the outlet pressure at the midpoint of the adjustment range. 2. Spring type, standard adjustment. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, th e loading of which is adjustable. The adjustment means shall be con- cealed. Multistage. A regulator for use with a single gas whose adjustment means is capable of being positioned manually or automatically to two or more predetermined outlet pressure settin gs. Each of these settings shall be adjustable or nonadjustable. The regulator may modulate outlet pressures automatically between its maximum and minimum predetermined outlet pressure settings. Nonadjustable. 1. Spring type, nonadjustable. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, the loading of which is not field adjustable. 2. Weight type. A regulator in which the regulating force acting upon the diaphragm is derived from a weight or combina tion of weights. REGULATOR, LINE GAS PRESSURE. A device placed in a gas line between the service pressure regulator and the appliance for controlling, maintaining or reducing the pressure in that portion of the piping system downstream of the device. REGUL ATOR, MEDIUM - PRESSURE (MP Regulator). A line pressure regulator that reduces gas pressure from the range of greater than 0.5 psig (3.4 kPa) and less than or equal to 5 psig (34.5 kPa) to a lower pressure. REGULATOR, PRESSURE. A device placed in a gas line for reducing, controlling and maintaining the pressure in that portion of the piping system downstream of the device. REGULATOR, SERVICE PRESSURE. A device installed by the serving gas supplier to reduce and limit the ser- vice line pressure to delivery pres sure. RELIEF OPENING. The opening provided in a draft hood to permit the ready escape to the atmosphere of the flue products from the draft hood in the event of no draft, back draft or stoppage beyond the draft hood, and to permit air into the draft hood i n the event of a strong chimney updraft. RELIEF VALVE (DEVICE). A safety valve designed to forestall the development of a dangerous condition by relieving either pressure, temperature or vacuum . RELIEF VALVE, PRESSURE. An automatic valve that opens and clo ses a relief vent, depending on whether the pressure is above or below a predetermined value. 2022 NEW YORK CITY FUEL GAS CODE 2 - 1 ‡‡‡ Chapter 2 was amended by Local Law 77 of 2023 . This law has an effective date of June 10, 2023. CHAPTER 2 DEFINITIONS SECTION FGC 201 GENERAL 201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code and standard, have the meanings indicated in this chapter. 201.2 Inter changeability. Words used in the present tense include the future; words in the masculine gender in- clude the feminine and neuter; the singular number includes the plural and the plural, the singular. 201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the New York City Electrical Code , New York City Building Code , New York City Fire Code , New York City Mechanical Code , New York City Plumbing Code , or the New York City Energy Conservation Code , such terms shall have meanings ascribed to them as in those codes. ‡‡‡ 201.3.1 Terms defined in the general administrative provisions. The following terms are defined in Sec- tion 28 - 101.5 of the Administrative Code : 1968 BUILDING CODE. 1968 OR PRIOR CODE BUILDINGS OR STRUCTURES (PRIOR CODE BUILDINGS). ACCEPTANCE OR ACCEPTED. ADDITION. ADMINISTRATIVE CODE. ALTERATION. APPROVAL OR APPROVED. APPROVED AGENCY. APPROVED FABRICATOR. APPROVED INSPECTION AGENCY. APPROVED TESTING AGENCY. ARCHITECT. BUILDING. CERTIFICATE OF COMPLIANCE. CHARTER. CITY. COMMISSIONER. CONSTRUCTION DOCUMENTS. DAY. DEFERRED SUBMITTAL. DEMOLITION. DEMOLITION, FULL. DEFINITIONS 2 - 2 2022 NEW YORK CITY FUEL GAS CODE DEMOLITION, PARTIAL. DEPARTMENT. ENGINEER. ENLARGEMENT. ENVIRONMENTAL CONTROL BOARD or ECB. EXISTING BUILDING OR STRUCTUR E. FABRICATED ITEM. FIRE PROTECTION PLAN. HEREAFTER. HERETOFORE. INSPECTION CERTIFICATE. INTERIM CERTIFICATE OF OCCUPANCY. LABEL. LABELED. LAND SURVEYOR. LANDSCAPE ARCHITECT. LETTER OF COMPLETION. LIMITED ALTERATION APPLICATION. LIMITED PLUMBING ALTERATIONS. LIMITED SPRINKLER ALTERATIONS. LIMITED STANDPIPE ALTERATIONS. LISTED. MAIN USE OR DOMINANT OCCUPANCY (OF A BUILDING). MANUFACTURER’S DESIGNATION. MARK. MATERIALS. OCCUPANCY. OWNER. PARTY WALL. PERMIT. PERSON. PREMISES. PRIOR CODE BUILDING. PROFESSIONAL CERTIFICATION. PROGRESS INSPECTION. PROJECT. REGISTERED DESIGN PROFESSIONAL. REGISTERED DESIGN PROFESSIONAL OF RECORD. REQUIRED. RETAINING WALL. SERVICE EQUIPMENT. SIGN - OFF. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 3 SINGLE ROOM OCCUPANCY MULTIPLE DWELLING. SPECIAL INSPECTION . SPECIAL INSPECTION AGENCY. SPECIAL INSPECTOR. STRUCTURE. SUBMITTAL DOCUMENTS. SUPERINTENDENT OF CONSTRUCTION (CONSTRUCTION SUPERINTENDENT). USE (USED). UTILITY COMPANY OR PUBLIC UTILITY COMPANY. UTILITY CORPORATION OR PUBLIC UTILITY CORPORATION. WORK NOT CONSTITUTING MINOR ALTERATIONS OR ORDINARY REPAIRS. WRITING (WRITTEN). WRITTEN NOTICE. ZONING RESOLUTION. 201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have ordin arily accepted meanings such as the context implies. ‡‡‡ SECTION FGC 202 GENERAL DEFINITIONS ABNORMAL OPERATING CONDITION. A condition that may indicate a malfunction or a noncompliant com- ponent of a piping system or appliance. ACCESS (TO). That which enables a device, fixture, appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel, door or similar obstruction (see also “Ready access (to) ”). AIR CONDITIONER, GAS - FIRED. A gas - b urning, automatically operated appliance for supplying cooled or dehumidified air or chilled liquid. AIR CONDITIONING. The treatment of air so as to control simultaneously the temperature, humidity, cleanness and distribution of the air to meet the require ments of a conditioned space. AIR, EXHAUST. See “Exhaust.” AIR - HANDLING UNIT. A blower or fan used for the purpose of distributing supply air to a room, space or area. AIR, MAKEUP. Any combination of outdoor and transfer air intended to replace exhaust air and exfiltration. APPLIANCE. Any apparatus or device that utilizes a fuel or raw material to produce light, heat, power, refrigeration or air conditioning. APPLIANCE, AUTOMATICALLY CONTROLLED. Appliances equipped with an automatic b urner ignition and safety shutoff device and other automatic devices which accomplish complete turn - on and shutoff of the gas to the main burner or burners, and graduate the gas supply to the burner or burners, but do not affect complete shutoff of the gas . APPLIANCE TYPE. Low - heat appliance (residential appliance). Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of 1,000 ° F (538 ° C) or less. Medium - heat appliance. Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of more than 1,000 ° F (538 ° C ) or less but not greater than 2,000 ° F ( 1093 .3° C). DEFINITIONS 2 - 4 2022 NEW YORK CITY FUEL GAS CODE APPLIANCE, UNVENTED. An appliance designed or installed in such a manner that the products of combustion are not conveyed by a vent or chimney directly to the outdoor atmosphere. APPLIANCE, VENTED. An appliance designed and installed in such a manner that all of the products o f com- bustion are conveyed directly from the appliance to the outdoor atmosphere through an approved chimney or vent system. See also “VENTED APPLIANCE CATEGORIES.” ATMOSPHERIC PRESSURE. The pressure of the weight of air and water vapor on the surface of th e earth, ap- proximately 14.7 pounds per square inch (psi) (101 kPa absolute) at sea level. BAFFLE. An object placed in an appliance to change the direction of or retard the flow of air, air - gas mixtures or flue gases. BAROMETRIC DRAFT REGULATOR. A balanced damper device attached to a chimney, vent connector, breeching or flue gas manifold to protect combustion appliances by controlling chimney draft. A double - acting barometric draft regulator is one in which the balancing damper is free to move in either direction to protect combustion appliances from both excessive draft and backdraft. BOILER, HIGH - PRESSURE. An appliance for supplying steam or hot water that, for a steam boiler, operates at a pressure of more than 15 psig ( 103.4 kPa gauge), and for a hot water boiler, operates at a pressure exceeding 160 psig ( 1103 kPa gauge) or at a temperature exceeding 250° F ( 121.1 °C). BOILER, LOW - PRESSURE. A self - contained appliance for supplying steam or hot water as follows: Hot water heating boiler. A boiler in which no steam is generated, from which hot water is circulated for heating purposes and then returned to the boiler, and that operates at water pressures not exceeding 160 pounds per square inch gauge (psig) ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Hot water supply boiler. A boiler, completely fill ed with water, which furnishes hot water to be used externally to itself, and that operates at water pressures not exceeding 160 psig ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Steam heating boile r. A boiler in which steam is generated and that operates at a steam pressure not exceeding 15 psig ( 103.4 kPa gauge). BRANCH. A section of gas piping downstream from a riser, leading to appliances or equipment on no more than two consecutive floors. BRAZING. A metal - joining process wherein coalescence is produced by the use of a nonferrous filler metal having a melting point above 1,000°F ( 537.8 ° C), but lower than that of the base metal being joined. The filler material is distributed between the clos ely fitted surfaces of the joint by capillary action. BROILER. A general term including salamanders, barbecues and other appliances cooking primarily by radiated heat, excepting toasters. BTU. Abbreviation for British thermal unit, which is the quantity of heat required to raise the temperature of 1 pound (454 g) of water 1°F ( - 17.2 ° C) (1 Btu = 1055 J). BURNER. A device for the final conveyance of the gas, or a mixture of gas and air, to the combustion zone. Induced draft. A burner that depends on draft induced by a fan that is an integral part of the appliance and is located downstream from the burner. Power. A burner in which gas, air or both are supplied at pressures exceeding, for gas, the line pressure, and for air, atmospheric pressure, with t his added pressure being applied at the burner. CHIMNEY. A primarily vertical structure containing one or more flues used to remove hot gases from burning fuel, refuse, or industrial processes from a fuel - burning appliance to the outdoor atmosphere. Factor y - built chimney. A listed and labeled chimney composed of factory - made components, assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 5 Masonry chimney. A field - constructed chimney composed of solid mason ry units, bricks, stones or concrete. Metal chimney. A field - constructed chimney composed of metal. CLEARANCE. The minimum distance through air measured between the heat - producing surface of the mechanical appliance, device or equipment and the surface of the combustible material or assembly. CLOTHES DRYER. An appliance used to dry wet laundry by means of heated air. Dryer classifications are as follows: Type 1. Factory - built package, multiple production. Primarily used in family living environment. Usually the smallest unit physically and in function output. Type 2. Factory - built package, multiple production. Used in business with direct intercourse of the functi on with the public. Not designed for use in individual family living environment. COMBUSTIBLE ASSEMBLY. Wall, floor, ceiling or other assembly constructed of one or more component mate- rials that are not defined as noncombustible. COMBUSTIBLE MATERIAL. Any material not defined as noncombustible. COMBUSTION. In the context of this code, refers to the rapid oxidation of fuel accompanied by the production of heat or heat and light. COMBUSTION AIR . Air necessary for complete combustion of a fuel, including theor etical air and excess air. COMBUSTION CHAMBER. The portion of an appliance within which combustion occurs. COMBUSTION PRODUCTS. Constituents resulting from the combustion of a fuel with the oxygen of the air, including inert gases, but excluding excess air. CONCEALED LOCATION. A location that cannot be accessed without damaging permanent parts of the building structure or finished surface. Spaces above, below or behind readily removable panels or doors shall not be considered as concealed. CONCEAL ED PIPING. Piping that is located in a concealed location (see “Concealed location ”). CONDENSATE. The liquid that condenses from a gas (including flue gas) caused by a reduction in temperature or increase in pressure. CONNECTOR, APPLIANCE (Fuel). Rigid metallic pipe and fittings or a listed and labeled device that connects an appliance to the gas piping system. CONNECTOR, CHIMNEY OR VENT. The pipe that connects an appliance to a chimney or vent. CONTROL. A manual or automatic device designed to re gulate the gas, air, water or electrical supply to, or operation of, a mechanical system. CONVERSION BURNER. A unit consisting of a burner and its controls for installation in an appliance originally uti- lizing another fuel. COUNTER APPLIANCES. Appliances s uch as coffee brewers and coffee urns and any appurtenant water - heating ap- pliance, food and dish warmers, hot plates, griddles, waffle bakers and other appliances designed for installation on or in a counter. CUBIC FOOT. The amount of gas that occupies 1 c ubic foot (0.02832 m 3 ) when at a temperature of 60°F ( 15.6 ° C), saturated with water vapor and under a pressure equivalent to that of 30 inches of mercury (101 kPa). DAMPER. A manually or automatically controlled device to regulate draft or the rate of flow of air or combustion gases. DECORATIVE APPLIANCE, VENTED. A vented appliance wherein the primary function lies in the aesthetic effect of the flames. DEFINITIONS 2 - 6 2022 NEW YORK CITY FUEL GAS CODE DECORATIVE APPLIANCES FOR INSTALLATION IN VENTED FIREPLACES. A vented appliance de- signed for installa tion within the fire chamber of a vented fireplace, wherein the primary function lies in the aesthetic effect of the flames. DECORATIVE SHROUD. A listed, partial, noncombustible enclosure for aesthetic purposes that is installed at the termination of a ven ting system that surrounds or conceals a factory - built chimney system or vent cap. DEMAND. The maximum amount of gas input required per unit of time, usually expressed in cubic feet per hour (1 ft 3 = 0.0283 m 3 ), or Btu/h (1 Btu/h = 0.2931 W). DILUTION AIR. Air that is introduced into a draft hood and is mixed with the flue gases. DIRECT - VENT APPLIANCES. Appliances that are constructed and installed so that all air for combustion is derived directly from the outdo or atmosphere and all flue gases are discharged directly to the outdoor atmosphere. DRAFT. The pressure difference existing between the appliance or any component part and the atmosphere, that causes a continuous flow of air and products of combustion thro ugh the gas passages of the appliance to the atmos- phere. Induced draft. The pressure difference created by the action of a fan, blower or ejector, that is located between the appliance and the chimney or vent termination. Natural draft. The pressure difference created by a vent or chimney because of its height, and the temperature difference between the flue gases and the atmosphere. DRAFT HOOD. A nonadjustable device built into an appliance, or made as part of the vent connector from an appl iance, that is designed to (1) provide for ready escape of the flue gases from the appliance in the event of no draft, backdraft or stoppage beyond the draft hood, (2) prevent a backdraft from entering the appliance, and (3) neutralize the effect of stack action of the chimney or gas vent upon operation of the appliance. DRAFT REGULATOR. A device that functions to maintain a desired draft in the appliance by automatically reducing the draft to the desired value. DRIP. A nipple and cap placed at a low point in a system of piping to collect condensate and from which the conden- sate is removable. DRY GAS. A gas having a moisture and hydrocarbon dew point below any normal temperature to which the gas piping is exposed. DUCT FURNACE. A warm - air furnace or heater n ormally installed in an air distribution duct to supply warm air for heating. This definition shall apply only to a warm - air heating appliance that, for air circulation, depends on a blower not furnished as part of the furnace. DUCT SYSTEM. A continuous pa ssageway for the transmission of air that, in addition to ducts, includes duct fittings, dampers, plenums, fans and accessory air - handling equipment and appliances . DWELLING. A building or structure which is occupied in whole or in part as the home, residence or sleeping place of one or more families. DWELLING UNIT. A single unit consisting of one or more habitable rooms and occupied or arranged to be occupied as a unit separa te from all other units within a dwelling. EQUIPMENT. Any apparatus or device that delivers gas as a fuel or raw material to an appliance or vents combustion products from an appliance, including but not limited to control devices, pressure regulators, val ves, appliance appurtenances, gas connectors, or power exhausters used in connections to appliances. EXCESS FLOW VALVE (EFV). A safety shut - off valve designed to activate to interrupt the flow of gas when the fuel gas passing through it exceeds a prescribe d flow rate. Installed where specifically required by code or utility company. EXHAUST. Air being removed from any space, appliance or piece of equipment conveyed directly to the atmosphere by means of openings or ducts. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 7 EXTERIOR MASONRY CHIMNEYS. Masonry chimneys exposed to the outdoors on one or more sides below the roof line. FIREPLACE. An assembly consisting of a hearth and fire chamber of noncombustible material and provided with a chimney , for use with solid fuels. Factory - built fireplace. A listed and labeled fireplace and chimney system composed of factory - made compo- nents , and assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. Masonry fireplace. A hearth and fire chamber of s olid masonry units such as bricks, stones, listed masonry units or reinforced concrete, provided with a suitable chimney. FLAME SAFEGUARD. A device that will automatically shut off the fuel supply to a main burner or group of burners when the means of igni tion of such burners becomes inoperative, and when flame failure occurs on the burner or group of burners. FLASHBACK ARRESTOR CHECK VALVE. A device that will prevent the backflow of one gas into the supply system of another gas and prevent the passage of flame into the gas supply system. FLOOR FURNACE. A completely self - contained furnace suspended from the floor of the space being heated, ta king air for combustion from outside such space and with means for observing flames and lighting the appliance from such space. Fan type. A floor furnace equipped with a fan that provides the primary means for circulating air. Gravity type. A floor furnace depending primarily on circulation of air by gravity. This classification shall also include floor furnaces equipped with booster - type fans that do not materially restrict free circulation of air by gravity flow when such fans are not in operation. FLUE. A passageway within a chimney or vent through which gaseous combustion products pass. FLUE, APPLIANCE. The passage(s) within an appliance through which combustion products pass from the combustion chamber of the appliance to the draft hood inlet opening on an appliance equipped with a draft hood or to the outlet of the appliance on an appliance not equipped with a draft hood. FLUE COLLAR. That portion of an appliance designed for the attachment of a draft hood, vent connector or venting system. FL UE GASES. Products of combustion plus excess air in fireplace and appliance flues or heat exchangers. FLUE LINER (LINING). A system or material used to form the inside surface of a flue in a chimney or vent, for the purpose of protecting the surrounding st ructure from the effects of combustion products and for conveying combustion products without leakage into the atmosphere. FUEL GAS. A natural gas, manufactured gas, liquefied petroleum gas or mixtures of these gases. FURNACE. A completely self - contained h eating unit that is designed to supply heated air to spaces remote from or adjacent to the appliance location. FURNACE, CENTRAL. A self - contained appliance for heating air by transfer of heat of combustion through metal to the air, and designed to supply h eated air through ducts to spaces remote from or adjacent to the appliance location. Forced - air type. A central furnace equipped with a fan or blower that provides the primary means for circulation of air. FURNACE PLENUM. An air compartment or chamber to which one or more ducts are connected and that forms part of an air distribution system. GAS CONVENIENCE OUTLET. A permanently mounted, manually operated device that provides the means for connecting an appliance to, and d isconnecting an appliance from, the supply piping. The device includes an integral, manually operated valve with a nondisplaceable valve member and is designed so that disconnection of an appliance only occurs when the manually operated valve is in the clo sed position. DEFINITIONS 2 - 8 2022 NEW YORK CITY FUEL GAS CODE GAS PIPING. An installation of pipe, valves or fittings installed on a premises or in a building and utilized to convey fuel gas. GAS UTILIZATION EQUIPMENT. An appliance that utilizes gas as a fuel or raw material or both. HAZARDOUS LOCATION. Any location considered to be a fire hazard for flammable vapors, dust, combustible fibers or other highly combustible substances. The location is not necessarily categorized in the New York City Building Code as a high - hazard group classification. HOUSE PIPING. See “Piping system.” HYDROGEN FUEL GAS ROOM. A separately ventilated, fully enclosed room designed to exclusively house the generation of gaseous hydrogen for immediate on - premises use in indoor fuel cells or other energy production process, and incidental indoor storage of gaseous hydrogen. A hydro gen fuel gas room is not intended to house the production or dispensing of hydrogen motor fuel. IGNITION SOURCE. A flame, spark or hot surface capable of igniting flammable vapors or fumes. Such sources include appliance burners, burner ignitors, and elect rical switching devices. INCINERATOR. An appliance used to reduce combustible refuse material to ashes and that is manufactured, sold and installed as a complete unit. INDUSTRIAL AIR HEATERS, NONRECIRCULATING DIRECT - FIRED . A heater in which all the product s of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating only outdoor air. INDUSTRIAL AIR HEATERS, RECIRCULATING DIRECT - FIRED . A heater in which all the pro ducts of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating outdoor air, and, if applicable, indoor air. INFRARED RADIANT HEATER. A heater that directs a s ubstantial amount of its energy output in the form of infrared radiant energy into the area to be heated. Such heaters are of either the vented or unvented type. INTEGRAL VENT APPLIANCES. Appliances designed for outdoor installation that have built - in natu ral or me- chanical venting means and are constructed and installed so that all air for combustion is derived from the outdoor atmosphere and all flue gases are discharged to the outdoor atmosphere through an integral vent termination. INTERLOCK. A device actuated by another device with which it is directly associated, to govern succeeding oper- ations of the same or allied devices. A circuit in which a given action cannot occur until after one or more other actions have taken place. JOINT, FLANGED. A joint made by bolting together a pair of flanged ends. JOINT, FLARED. A metal - to - metal compression joint in which a conical spread is made on the end of a tube that is compressed by a flare nut against a mating flare. JOINT, MECHANICAL. A general form o f gas - tight joints obtained by the joining of metal parts through a positive - holding mechanical construction, such as press joint, flanged joint, threaded joint, flared joint or compression joint. JOINT, PLASTIC ADHESIVE. A joint made in thermoset plastic piping by the use of an adhesive substance that forms a continuous bond between the mating surfaces without dissolving either one of them. JOINT, PLASTIC HEAT FUSION. A joint made in thermoplastic piping by heating the parts sufficiently to permit fusion o f the materials when the parts are pressed together. JOINT, WELDED. A gas - tight joint obtained by the joining of metal parts in molten state. LEAK CHECK. An operation performed on a gas piping system to verify that the system does not leak. Leakage checks are intended to discover open outlets, defective appliance connection and defects that have developed since the initial installation, normally performed after pressure testing. LIMIT CONTROL. A device responsive to changes in pressure, temperature or level for turning on, shutting off or throttling the gas supply to an appliance. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 9 LIQUEFIED PETROLEUM GAS or LPG (LP - GAS). Liquefied petroleum gas composed predominately of pro- pane, propylene, buta nes or butylenes, or mixtures thereof that is gaseous under normal atmospheric conditions, but is capable of being liquefied under moderate pressure at normal temperatures. LIVING SPACE. Space within a dwelling unit utilized for living, sleeping, eating, c ooking, bathing, washing and sanitation purposes. LOG LIGHTER. A manually operated solid fuel ignition appliance for installation in a vented solid fuel - burning fireplace. MAIN BURNER. A device or group of devices essentially forming an integral unit for t he final conveyance of gas or a mixture of gas and air to the combustion zone, and in which combustion takes place to accomplish the function for which the appliance is designed. METER. The instrument installed to measure the volume of gas delivered throug h it. NPS. An abbreviation for “Nominal pipe size.” NONCOMBUSTIBLE MATERIALS. Materials that, when tested in accordance with ASTM E 136, have at least three of four specimens tested meeting all of the following criteria: 1. The recorded temperature of the surface and interior thermocouples shall not at any time during the test rise more than 54ºF (12.2ºC) above the furnace temperature at the beginning of the test. 2. There shall not be flaming from the specimen after the first 30 seconds. 3. If the weight l oss of the specimen during testing exceeds 50 percent, the recorded temperature of the surface and interior thermocouples shall not at any time during the test rise above the furnace air temperature at the beginning of the test, and there shall not be flam ing of the specimen. OFFSET (VENT). A combination of approved bends that makes two changes in direction bringing one section of the vent out of line but into a line parallel with the other section. ORIFICE. The opening in a cap, spud or other device whereb y the flow of gas is limited and through which the gas is discharged to the burner. OUTLET. The point at which a gas - fired appliance connects to the gas piping system. OXYGEN DEPLETION SAFETY SHUTOFF SYSTEM (ODS). A system designed to act to shut off the g as sup- ply to the main and pilot burners if the oxygen in the surrounding atmosphere is reduced below a predetermined level. PILOT. A small flame that is utilized to ignite the gas at the main burner or burners. PIPING. Where used in this code, “piping” refers to either pipe or tubing, or both. Pipe. A rigid conduit of iron, steel, copper, brass or plastic. Tubing. Semirigid conduit of copper, aluminum, plastic or steel. PIPING SYSTEM. All fuel piping, valves and fitting s from the outlet of the point of delivery to the outlets of the appliance shutoff valves. PLASTIC, THERMOPLASTIC. A plastic that is capable of being repeatedly softened by increase of temperature and hardened by decrease of temperature. POINT OF DELIVERY. For natural gas systems, the point of delivery is the outlet of the service meter assembly or the outlet of the service regulator or service shutoff valve where a meter is not provided. Where a valve is provided at the outlet of the service meter assembly, such valve shall be considered to be downstream of the point of delivery. PORTABLE FUEL CELL APPLIANCE. A fuel cell generator of electricity, which is not fixed in place. A portable fuel cell appliance utilizes a cord and plug connection to a gr id - isolated load and has an integral fuel supply. PRESSURE DROP. The loss in pressure due to friction or obstruction in pipes, valves, fittings, regulators and burn- ers. DEFINITIONS 2 - 10 2022 NEW YORK CITY FUEL GAS CODE PRESSURE TEST. An operation performed to verify the gas - tight integrity of gas piping f ollowing its installation or modification. PURGE. To free a gas conduit of air or gas, or a mixture of gas and air. QUICK - DISCONNECT DEVICE. A hand - operated device that provides a means for connecting and disconnecting an appliance or an appliance connecto r to a gas supply and that is equipped with an automatic means to shut off the gas supply when the device is disconnected. READY ACCESS (TO). That which enables a device, fixture, appliance or equipment to be directly reached, without requiring the removal or movement of any panel, door or similar obstruction (see “Access (to) ”). REGULATOR. A device for controlling and maintaining a uniform supply pressure, either pounds - to - inches water column (MP regulator) or inches - to - inches water column (appliance regulator). REGULATOR, GAS APPLIANCE. A pressure regulator for controlling pressure to the manifold of the appliance. Types of appliance regulators are as follows: Adjustable. 1. Spring type, limited adjustment. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, the loading of which is adjus table over a range of not more than 15 percent of the outlet pressure at the midpoint of the adjustment range. 2. Spring type, standard adjustment. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, th e loading of which is adjustable. The adjustment means shall be con- cealed. Multistage. A regulator for use with a single gas whose adjustment means is capable of being positioned manually or automatically to two or more predetermined outlet pressure settin gs. Each of these settings shall be adjustable or nonadjustable. The regulator may modulate outlet pressures automatically between its maximum and minimum predetermined outlet pressure settings. Nonadjustable. 1. Spring type, nonadjustable. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, the loading of which is not field adjustable. 2. Weight type. A regulator in which the regulating force acting upon the diaphragm is derived from a weight or combina tion of weights. REGULATOR, LINE GAS PRESSURE. A device placed in a gas line between the service pressure regulator and the appliance for controlling, maintaining or reducing the pressure in that portion of the piping system downstream of the device. REGUL ATOR, MEDIUM - PRESSURE (MP Regulator). A line pressure regulator that reduces gas pressure from the range of greater than 0.5 psig (3.4 kPa) and less than or equal to 5 psig (34.5 kPa) to a lower pressure. REGULATOR, PRESSURE. A device placed in a gas line for reducing, controlling and maintaining the pressure in that portion of the piping system downstream of the device. REGULATOR, SERVICE PRESSURE. A device installed by the serving gas supplier to reduce and limit the ser- vice line pressure to delivery pres sure. RELIEF OPENING. The opening provided in a draft hood to permit the ready escape to the atmosphere of the flue products from the draft hood in the event of no draft, back draft or stoppage beyond the draft hood, and to permit air into the draft hood i n the event of a strong chimney updraft. RELIEF VALVE (DEVICE). A safety valve designed to forestall the development of a dangerous condition by relieving either pressure, temperature or vacuum . RELIEF VALVE, PRESSURE. An automatic valve that opens and clo ses a relief vent, depending on whether the pressure is above or below a predetermined value. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 11 RELIEF VALVE, TEMPERATURE. Manual reset type. A valve that automatically opens a relief vent at a predetermined temperature and that must be manually returned to the closed position. Reseating or self - closing type. An automatic valve that opens and closes a relief vent, depending on whether the temperature is above or below a predetermined value. RELIEF VALVE, VACUUM. A valve that automatically opens and closes a v ent for relieving a vacuum within the hot water supply system, depending on whether the vacuum is above or below a predetermined value. RISER, GAS. A vertical pipe supplying fuel gas that extends one full story or more . ROOM HEATER, UNVENTED. See “Unvented room heater.” ROOM HEATER, VENTED. See “Vented room heater. ” ROUGH - IN. Parts of the gas system that are installed prior to the installation of appliances or equipment. This in- cludes gas piping, all the necessary supports and any appliances that are built into the structure. SAFETY SHUTOFF DEVICE. See “Flame safeguard.” SERVI CE PIPING. All fuel - gas piping, valves and fittings upstream of the point of delivery. SHAFT. An enclosed space extending through one or more stories of a building, connecting vertical openings in successive floors, or floors and the roof. SLEEPING UNIT. A dwelling unit, which may contain either toilet or kitchen facilities but not both. Any sleeping unit housing more than one family shall also be classified as a congregate living unit. The creation of or conversion to sleeping units shall be limited by Sec tion 27 - 2077 of the New York City Housing Maintenance Code . SPECIFIC GRAVITY. As applied to gas, specific gravity is the ratio of the weight of a given volume to that of the same volume of air, both measured under the same condition. STATIONARY FUEL CELL P OWER PLANT. A self - contained package or factory - matched packages that con- stitute an automatically operated assembly of integrated systems for generating electrical energy and recoverable ther- mal energy that is permanently connected and fixed in place. THER MOSTAT. Electric switch type. A device that senses changes in temperature and controls electrically, by means of separate components, the flow of gas to the burner(s) to maintain selected temperatures. Integral gas valve type. An automatic device, actuated by temperature changes, desi gned to control the gas supply to the burner(s) in order to maintain temperatures between predetermined limits, and in which the thermal actuating element is an integral part of the device. 1. Graduating thermostat. A thermostat in which the motion of the valve is approximately in direct proportion to the effective motion of the thermal element induced by temperature change. 2. Snap - acting thermostat. A thermostat in which the thermostatic valve travels instantly from the closed to the open position, and vi ce versa. THIRD - PARTY CERTIFICATION AGENCY. An approved agency operating a product or material certification system that incorporates initial product testing, assessment and surveillance of a manufacturer’s quality control sys- tem. THIRD - PARTY CERTIFIED. Ce rtification obtained by the manufacturer indicating that the function and perfor- mance characteristics of a product or material have been determined by testing and ongoing surveillance by an ap- proved third - party certification agency. Assertion of certificat ion is in the form of identification in accordance with the requirements of the third - party certification agency. THIRD - PARTY TESTED. Procedure by which an approved testing laboratory provides documentation that a prod- uct, material or system conforms to sp ecified requirements. 2022 NEW YORK CITY FUEL GAS CODE 2 - 1 ‡‡‡ Chapter 2 was amended by Local Law 77 of 2023 . This law has an effective date of June 10, 2023. CHAPTER 2 DEFINITIONS SECTION FGC 201 GENERAL 201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code and standard, have the meanings indicated in this chapter. 201.2 Inter changeability. Words used in the present tense include the future; words in the masculine gender in- clude the feminine and neuter; the singular number includes the plural and the plural, the singular. 201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the New York City Electrical Code , New York City Building Code , New York City Fire Code , New York City Mechanical Code , New York City Plumbing Code , or the New York City Energy Conservation Code , such terms shall have meanings ascribed to them as in those codes. ‡‡‡ 201.3.1 Terms defined in the general administrative provisions. The following terms are defined in Sec- tion 28 - 101.5 of the Administrative Code : 1968 BUILDING CODE. 1968 OR PRIOR CODE BUILDINGS OR STRUCTURES (PRIOR CODE BUILDINGS). ACCEPTANCE OR ACCEPTED. ADDITION. ADMINISTRATIVE CODE. ALTERATION. APPROVAL OR APPROVED. APPROVED AGENCY. APPROVED FABRICATOR. APPROVED INSPECTION AGENCY. APPROVED TESTING AGENCY. ARCHITECT. BUILDING. CERTIFICATE OF COMPLIANCE. CHARTER. CITY. COMMISSIONER. CONSTRUCTION DOCUMENTS. DAY. DEFERRED SUBMITTAL. DEMOLITION. DEMOLITION, FULL. DEFINITIONS 2 - 2 2022 NEW YORK CITY FUEL GAS CODE DEMOLITION, PARTIAL. DEPARTMENT. ENGINEER. ENLARGEMENT. ENVIRONMENTAL CONTROL BOARD or ECB. EXISTING BUILDING OR STRUCTUR E. FABRICATED ITEM. FIRE PROTECTION PLAN. HEREAFTER. HERETOFORE. INSPECTION CERTIFICATE. INTERIM CERTIFICATE OF OCCUPANCY. LABEL. LABELED. LAND SURVEYOR. LANDSCAPE ARCHITECT. LETTER OF COMPLETION. LIMITED ALTERATION APPLICATION. LIMITED PLUMBING ALTERATIONS. LIMITED SPRINKLER ALTERATIONS. LIMITED STANDPIPE ALTERATIONS. LISTED. MAIN USE OR DOMINANT OCCUPANCY (OF A BUILDING). MANUFACTURER’S DESIGNATION. MARK. MATERIALS. OCCUPANCY. OWNER. PARTY WALL. PERMIT. PERSON. PREMISES. PRIOR CODE BUILDING. PROFESSIONAL CERTIFICATION. PROGRESS INSPECTION. PROJECT. REGISTERED DESIGN PROFESSIONAL. REGISTERED DESIGN PROFESSIONAL OF RECORD. REQUIRED. RETAINING WALL. SERVICE EQUIPMENT. SIGN - OFF. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 3 SINGLE ROOM OCCUPANCY MULTIPLE DWELLING. SPECIAL INSPECTION . SPECIAL INSPECTION AGENCY. SPECIAL INSPECTOR. STRUCTURE. SUBMITTAL DOCUMENTS. SUPERINTENDENT OF CONSTRUCTION (CONSTRUCTION SUPERINTENDENT). USE (USED). UTILITY COMPANY OR PUBLIC UTILITY COMPANY. UTILITY CORPORATION OR PUBLIC UTILITY CORPORATION. WORK NOT CONSTITUTING MINOR ALTERATIONS OR ORDINARY REPAIRS. WRITING (WRITTEN). WRITTEN NOTICE. ZONING RESOLUTION. 201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have ordin arily accepted meanings such as the context implies. ‡‡‡ SECTION FGC 202 GENERAL DEFINITIONS ABNORMAL OPERATING CONDITION. A condition that may indicate a malfunction or a noncompliant com- ponent of a piping system or appliance. ACCESS (TO). That which enables a device, fixture, appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel, door or similar obstruction (see also “Ready access (to) ”). AIR CONDITIONER, GAS - FIRED. A gas - b urning, automatically operated appliance for supplying cooled or dehumidified air or chilled liquid. AIR CONDITIONING. The treatment of air so as to control simultaneously the temperature, humidity, cleanness and distribution of the air to meet the require ments of a conditioned space. AIR, EXHAUST. See “Exhaust.” AIR - HANDLING UNIT. A blower or fan used for the purpose of distributing supply air to a room, space or area. AIR, MAKEUP. Any combination of outdoor and transfer air intended to replace exhaust air and exfiltration. APPLIANCE. Any apparatus or device that utilizes a fuel or raw material to produce light, heat, power, refrigeration or air conditioning. APPLIANCE, AUTOMATICALLY CONTROLLED. Appliances equipped with an automatic b urner ignition and safety shutoff device and other automatic devices which accomplish complete turn - on and shutoff of the gas to the main burner or burners, and graduate the gas supply to the burner or burners, but do not affect complete shutoff of the gas . APPLIANCE TYPE. Low - heat appliance (residential appliance). Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of 1,000 ° F (538 ° C) or less. Medium - heat appliance. Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of more than 1,000 ° F (538 ° C ) or less but not greater than 2,000 ° F ( 1093 .3° C). DEFINITIONS 2 - 4 2022 NEW YORK CITY FUEL GAS CODE APPLIANCE, UNVENTED. An appliance designed or installed in such a manner that the products of combustion are not conveyed by a vent or chimney directly to the outdoor atmosphere. APPLIANCE, VENTED. An appliance designed and installed in such a manner that all of the products o f com- bustion are conveyed directly from the appliance to the outdoor atmosphere through an approved chimney or vent system. See also “VENTED APPLIANCE CATEGORIES.” ATMOSPHERIC PRESSURE. The pressure of the weight of air and water vapor on the surface of th e earth, ap- proximately 14.7 pounds per square inch (psi) (101 kPa absolute) at sea level. BAFFLE. An object placed in an appliance to change the direction of or retard the flow of air, air - gas mixtures or flue gases. BAROMETRIC DRAFT REGULATOR. A balanced damper device attached to a chimney, vent connector, breeching or flue gas manifold to protect combustion appliances by controlling chimney draft. A double - acting barometric draft regulator is one in which the balancing damper is free to move in either direction to protect combustion appliances from both excessive draft and backdraft. BOILER, HIGH - PRESSURE. An appliance for supplying steam or hot water that, for a steam boiler, operates at a pressure of more than 15 psig ( 103.4 kPa gauge), and for a hot water boiler, operates at a pressure exceeding 160 psig ( 1103 kPa gauge) or at a temperature exceeding 250° F ( 121.1 °C). BOILER, LOW - PRESSURE. A self - contained appliance for supplying steam or hot water as follows: Hot water heating boiler. A boiler in which no steam is generated, from which hot water is circulated for heating purposes and then returned to the boiler, and that operates at water pressures not exceeding 160 pounds per square inch gauge (psig) ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Hot water supply boiler. A boiler, completely fill ed with water, which furnishes hot water to be used externally to itself, and that operates at water pressures not exceeding 160 psig ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Steam heating boile r. A boiler in which steam is generated and that operates at a steam pressure not exceeding 15 psig ( 103.4 kPa gauge). BRANCH. A section of gas piping downstream from a riser, leading to appliances or equipment on no more than two consecutive floors. BRAZING. A metal - joining process wherein coalescence is produced by the use of a nonferrous filler metal having a melting point above 1,000°F ( 537.8 ° C), but lower than that of the base metal being joined. The filler material is distributed between the clos ely fitted surfaces of the joint by capillary action. BROILER. A general term including salamanders, barbecues and other appliances cooking primarily by radiated heat, excepting toasters. BTU. Abbreviation for British thermal unit, which is the quantity of heat required to raise the temperature of 1 pound (454 g) of water 1°F ( - 17.2 ° C) (1 Btu = 1055 J). BURNER. A device for the final conveyance of the gas, or a mixture of gas and air, to the combustion zone. Induced draft. A burner that depends on draft induced by a fan that is an integral part of the appliance and is located downstream from the burner. Power. A burner in which gas, air or both are supplied at pressures exceeding, for gas, the line pressure, and for air, atmospheric pressure, with t his added pressure being applied at the burner. CHIMNEY. A primarily vertical structure containing one or more flues used to remove hot gases from burning fuel, refuse, or industrial processes from a fuel - burning appliance to the outdoor atmosphere. Factor y - built chimney. A listed and labeled chimney composed of factory - made components, assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 5 Masonry chimney. A field - constructed chimney composed of solid mason ry units, bricks, stones or concrete. Metal chimney. A field - constructed chimney composed of metal. CLEARANCE. The minimum distance through air measured between the heat - producing surface of the mechanical appliance, device or equipment and the surface of the combustible material or assembly. CLOTHES DRYER. An appliance used to dry wet laundry by means of heated air. Dryer classifications are as follows: Type 1. Factory - built package, multiple production. Primarily used in family living environment. Usually the smallest unit physically and in function output. Type 2. Factory - built package, multiple production. Used in business with direct intercourse of the functi on with the public. Not designed for use in individual family living environment. COMBUSTIBLE ASSEMBLY. Wall, floor, ceiling or other assembly constructed of one or more component mate- rials that are not defined as noncombustible. COMBUSTIBLE MATERIAL. Any material not defined as noncombustible. COMBUSTION. In the context of this code, refers to the rapid oxidation of fuel accompanied by the production of heat or heat and light. COMBUSTION AIR . Air necessary for complete combustion of a fuel, including theor etical air and excess air. COMBUSTION CHAMBER. The portion of an appliance within which combustion occurs. COMBUSTION PRODUCTS. Constituents resulting from the combustion of a fuel with the oxygen of the air, including inert gases, but excluding excess air. CONCEALED LOCATION. A location that cannot be accessed without damaging permanent parts of the building structure or finished surface. Spaces above, below or behind readily removable panels or doors shall not be considered as concealed. CONCEAL ED PIPING. Piping that is located in a concealed location (see “Concealed location ”). CONDENSATE. The liquid that condenses from a gas (including flue gas) caused by a reduction in temperature or increase in pressure. CONNECTOR, APPLIANCE (Fuel). Rigid metallic pipe and fittings or a listed and labeled device that connects an appliance to the gas piping system. CONNECTOR, CHIMNEY OR VENT. The pipe that connects an appliance to a chimney or vent. CONTROL. A manual or automatic device designed to re gulate the gas, air, water or electrical supply to, or operation of, a mechanical system. CONVERSION BURNER. A unit consisting of a burner and its controls for installation in an appliance originally uti- lizing another fuel. COUNTER APPLIANCES. Appliances s uch as coffee brewers and coffee urns and any appurtenant water - heating ap- pliance, food and dish warmers, hot plates, griddles, waffle bakers and other appliances designed for installation on or in a counter. CUBIC FOOT. The amount of gas that occupies 1 c ubic foot (0.02832 m 3 ) when at a temperature of 60°F ( 15.6 ° C), saturated with water vapor and under a pressure equivalent to that of 30 inches of mercury (101 kPa). DAMPER. A manually or automatically controlled device to regulate draft or the rate of flow of air or combustion gases. DECORATIVE APPLIANCE, VENTED. A vented appliance wherein the primary function lies in the aesthetic effect of the flames. DEFINITIONS 2 - 6 2022 NEW YORK CITY FUEL GAS CODE DECORATIVE APPLIANCES FOR INSTALLATION IN VENTED FIREPLACES. A vented appliance de- signed for installa tion within the fire chamber of a vented fireplace, wherein the primary function lies in the aesthetic effect of the flames. DECORATIVE SHROUD. A listed, partial, noncombustible enclosure for aesthetic purposes that is installed at the termination of a ven ting system that surrounds or conceals a factory - built chimney system or vent cap. DEMAND. The maximum amount of gas input required per unit of time, usually expressed in cubic feet per hour (1 ft 3 = 0.0283 m 3 ), or Btu/h (1 Btu/h = 0.2931 W). DILUTION AIR. Air that is introduced into a draft hood and is mixed with the flue gases. DIRECT - VENT APPLIANCES. Appliances that are constructed and installed so that all air for combustion is derived directly from the outdo or atmosphere and all flue gases are discharged directly to the outdoor atmosphere. DRAFT. The pressure difference existing between the appliance or any component part and the atmosphere, that causes a continuous flow of air and products of combustion thro ugh the gas passages of the appliance to the atmos- phere. Induced draft. The pressure difference created by the action of a fan, blower or ejector, that is located between the appliance and the chimney or vent termination. Natural draft. The pressure difference created by a vent or chimney because of its height, and the temperature difference between the flue gases and the atmosphere. DRAFT HOOD. A nonadjustable device built into an appliance, or made as part of the vent connector from an appl iance, that is designed to (1) provide for ready escape of the flue gases from the appliance in the event of no draft, backdraft or stoppage beyond the draft hood, (2) prevent a backdraft from entering the appliance, and (3) neutralize the effect of stack action of the chimney or gas vent upon operation of the appliance. DRAFT REGULATOR. A device that functions to maintain a desired draft in the appliance by automatically reducing the draft to the desired value. DRIP. A nipple and cap placed at a low point in a system of piping to collect condensate and from which the conden- sate is removable. DRY GAS. A gas having a moisture and hydrocarbon dew point below any normal temperature to which the gas piping is exposed. DUCT FURNACE. A warm - air furnace or heater n ormally installed in an air distribution duct to supply warm air for heating. This definition shall apply only to a warm - air heating appliance that, for air circulation, depends on a blower not furnished as part of the furnace. DUCT SYSTEM. A continuous pa ssageway for the transmission of air that, in addition to ducts, includes duct fittings, dampers, plenums, fans and accessory air - handling equipment and appliances . DWELLING. A building or structure which is occupied in whole or in part as the home, residence or sleeping place of one or more families. DWELLING UNIT. A single unit consisting of one or more habitable rooms and occupied or arranged to be occupied as a unit separa te from all other units within a dwelling. EQUIPMENT. Any apparatus or device that delivers gas as a fuel or raw material to an appliance or vents combustion products from an appliance, including but not limited to control devices, pressure regulators, val ves, appliance appurtenances, gas connectors, or power exhausters used in connections to appliances. EXCESS FLOW VALVE (EFV). A safety shut - off valve designed to activate to interrupt the flow of gas when the fuel gas passing through it exceeds a prescribe d flow rate. Installed where specifically required by code or utility company. EXHAUST. Air being removed from any space, appliance or piece of equipment conveyed directly to the atmosphere by means of openings or ducts. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 7 EXTERIOR MASONRY CHIMNEYS. Masonry chimneys exposed to the outdoors on one or more sides below the roof line. FIREPLACE. An assembly consisting of a hearth and fire chamber of noncombustible material and provided with a chimney , for use with solid fuels. Factory - built fireplace. A listed and labeled fireplace and chimney system composed of factory - made compo- nents , and assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. Masonry fireplace. A hearth and fire chamber of s olid masonry units such as bricks, stones, listed masonry units or reinforced concrete, provided with a suitable chimney. FLAME SAFEGUARD. A device that will automatically shut off the fuel supply to a main burner or group of burners when the means of igni tion of such burners becomes inoperative, and when flame failure occurs on the burner or group of burners. FLASHBACK ARRESTOR CHECK VALVE. A device that will prevent the backflow of one gas into the supply system of another gas and prevent the passage of flame into the gas supply system. FLOOR FURNACE. A completely self - contained furnace suspended from the floor of the space being heated, ta king air for combustion from outside such space and with means for observing flames and lighting the appliance from such space. Fan type. A floor furnace equipped with a fan that provides the primary means for circulating air. Gravity type. A floor furnace depending primarily on circulation of air by gravity. This classification shall also include floor furnaces equipped with booster - type fans that do not materially restrict free circulation of air by gravity flow when such fans are not in operation. FLUE. A passageway within a chimney or vent through which gaseous combustion products pass. FLUE, APPLIANCE. The passage(s) within an appliance through which combustion products pass from the combustion chamber of the appliance to the draft hood inlet opening on an appliance equipped with a draft hood or to the outlet of the appliance on an appliance not equipped with a draft hood. FLUE COLLAR. That portion of an appliance designed for the attachment of a draft hood, vent connector or venting system. FL UE GASES. Products of combustion plus excess air in fireplace and appliance flues or heat exchangers. FLUE LINER (LINING). A system or material used to form the inside surface of a flue in a chimney or vent, for the purpose of protecting the surrounding st ructure from the effects of combustion products and for conveying combustion products without leakage into the atmosphere. FUEL GAS. A natural gas, manufactured gas, liquefied petroleum gas or mixtures of these gases. FURNACE. A completely self - contained h eating unit that is designed to supply heated air to spaces remote from or adjacent to the appliance location. FURNACE, CENTRAL. A self - contained appliance for heating air by transfer of heat of combustion through metal to the air, and designed to supply h eated air through ducts to spaces remote from or adjacent to the appliance location. Forced - air type. A central furnace equipped with a fan or blower that provides the primary means for circulation of air. FURNACE PLENUM. An air compartment or chamber to which one or more ducts are connected and that forms part of an air distribution system. GAS CONVENIENCE OUTLET. A permanently mounted, manually operated device that provides the means for connecting an appliance to, and d isconnecting an appliance from, the supply piping. The device includes an integral, manually operated valve with a nondisplaceable valve member and is designed so that disconnection of an appliance only occurs when the manually operated valve is in the clo sed position. DEFINITIONS 2 - 8 2022 NEW YORK CITY FUEL GAS CODE GAS PIPING. An installation of pipe, valves or fittings installed on a premises or in a building and utilized to convey fuel gas. GAS UTILIZATION EQUIPMENT. An appliance that utilizes gas as a fuel or raw material or both. HAZARDOUS LOCATION. Any location considered to be a fire hazard for flammable vapors, dust, combustible fibers or other highly combustible substances. The location is not necessarily categorized in the New York City Building Code as a high - hazard group classification. HOUSE PIPING. See “Piping system.” HYDROGEN FUEL GAS ROOM. A separately ventilated, fully enclosed room designed to exclusively house the generation of gaseous hydrogen for immediate on - premises use in indoor fuel cells or other energy production process, and incidental indoor storage of gaseous hydrogen. A hydro gen fuel gas room is not intended to house the production or dispensing of hydrogen motor fuel. IGNITION SOURCE. A flame, spark or hot surface capable of igniting flammable vapors or fumes. Such sources include appliance burners, burner ignitors, and elect rical switching devices. INCINERATOR. An appliance used to reduce combustible refuse material to ashes and that is manufactured, sold and installed as a complete unit. INDUSTRIAL AIR HEATERS, NONRECIRCULATING DIRECT - FIRED . A heater in which all the product s of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating only outdoor air. INDUSTRIAL AIR HEATERS, RECIRCULATING DIRECT - FIRED . A heater in which all the pro ducts of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating outdoor air, and, if applicable, indoor air. INFRARED RADIANT HEATER. A heater that directs a s ubstantial amount of its energy output in the form of infrared radiant energy into the area to be heated. Such heaters are of either the vented or unvented type. INTEGRAL VENT APPLIANCES. Appliances designed for outdoor installation that have built - in natu ral or me- chanical venting means and are constructed and installed so that all air for combustion is derived from the outdoor atmosphere and all flue gases are discharged to the outdoor atmosphere through an integral vent termination. INTERLOCK. A device actuated by another device with which it is directly associated, to govern succeeding oper- ations of the same or allied devices. A circuit in which a given action cannot occur until after one or more other actions have taken place. JOINT, FLANGED. A joint made by bolting together a pair of flanged ends. JOINT, FLARED. A metal - to - metal compression joint in which a conical spread is made on the end of a tube that is compressed by a flare nut against a mating flare. JOINT, MECHANICAL. A general form o f gas - tight joints obtained by the joining of metal parts through a positive - holding mechanical construction, such as press joint, flanged joint, threaded joint, flared joint or compression joint. JOINT, PLASTIC ADHESIVE. A joint made in thermoset plastic piping by the use of an adhesive substance that forms a continuous bond between the mating surfaces without dissolving either one of them. JOINT, PLASTIC HEAT FUSION. A joint made in thermoplastic piping by heating the parts sufficiently to permit fusion o f the materials when the parts are pressed together. JOINT, WELDED. A gas - tight joint obtained by the joining of metal parts in molten state. LEAK CHECK. An operation performed on a gas piping system to verify that the system does not leak. Leakage checks are intended to discover open outlets, defective appliance connection and defects that have developed since the initial installation, normally performed after pressure testing. LIMIT CONTROL. A device responsive to changes in pressure, temperature or level for turning on, shutting off or throttling the gas supply to an appliance. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 9 LIQUEFIED PETROLEUM GAS or LPG (LP - GAS). Liquefied petroleum gas composed predominately of pro- pane, propylene, buta nes or butylenes, or mixtures thereof that is gaseous under normal atmospheric conditions, but is capable of being liquefied under moderate pressure at normal temperatures. LIVING SPACE. Space within a dwelling unit utilized for living, sleeping, eating, c ooking, bathing, washing and sanitation purposes. LOG LIGHTER. A manually operated solid fuel ignition appliance for installation in a vented solid fuel - burning fireplace. MAIN BURNER. A device or group of devices essentially forming an integral unit for t he final conveyance of gas or a mixture of gas and air to the combustion zone, and in which combustion takes place to accomplish the function for which the appliance is designed. METER. The instrument installed to measure the volume of gas delivered throug h it. NPS. An abbreviation for “Nominal pipe size.” NONCOMBUSTIBLE MATERIALS. Materials that, when tested in accordance with ASTM E 136, have at least three of four specimens tested meeting all of the following criteria: 1. The recorded temperature of the surface and interior thermocouples shall not at any time during the test rise more than 54ºF (12.2ºC) above the furnace temperature at the beginning of the test. 2. There shall not be flaming from the specimen after the first 30 seconds. 3. If the weight l oss of the specimen during testing exceeds 50 percent, the recorded temperature of the surface and interior thermocouples shall not at any time during the test rise above the furnace air temperature at the beginning of the test, and there shall not be flam ing of the specimen. OFFSET (VENT). A combination of approved bends that makes two changes in direction bringing one section of the vent out of line but into a line parallel with the other section. ORIFICE. The opening in a cap, spud or other device whereb y the flow of gas is limited and through which the gas is discharged to the burner. OUTLET. The point at which a gas - fired appliance connects to the gas piping system. OXYGEN DEPLETION SAFETY SHUTOFF SYSTEM (ODS). A system designed to act to shut off the g as sup- ply to the main and pilot burners if the oxygen in the surrounding atmosphere is reduced below a predetermined level. PILOT. A small flame that is utilized to ignite the gas at the main burner or burners. PIPING. Where used in this code, “piping” refers to either pipe or tubing, or both. Pipe. A rigid conduit of iron, steel, copper, brass or plastic. Tubing. Semirigid conduit of copper, aluminum, plastic or steel. PIPING SYSTEM. All fuel piping, valves and fitting s from the outlet of the point of delivery to the outlets of the appliance shutoff valves. PLASTIC, THERMOPLASTIC. A plastic that is capable of being repeatedly softened by increase of temperature and hardened by decrease of temperature. POINT OF DELIVERY. For natural gas systems, the point of delivery is the outlet of the service meter assembly or the outlet of the service regulator or service shutoff valve where a meter is not provided. Where a valve is provided at the outlet of the service meter assembly, such valve shall be considered to be downstream of the point of delivery. PORTABLE FUEL CELL APPLIANCE. A fuel cell generator of electricity, which is not fixed in place. A portable fuel cell appliance utilizes a cord and plug connection to a gr id - isolated load and has an integral fuel supply. PRESSURE DROP. The loss in pressure due to friction or obstruction in pipes, valves, fittings, regulators and burn- ers. DEFINITIONS 2 - 10 2022 NEW YORK CITY FUEL GAS CODE PRESSURE TEST. An operation performed to verify the gas - tight integrity of gas piping f ollowing its installation or modification. PURGE. To free a gas conduit of air or gas, or a mixture of gas and air. QUICK - DISCONNECT DEVICE. A hand - operated device that provides a means for connecting and disconnecting an appliance or an appliance connecto r to a gas supply and that is equipped with an automatic means to shut off the gas supply when the device is disconnected. READY ACCESS (TO). That which enables a device, fixture, appliance or equipment to be directly reached, without requiring the removal or movement of any panel, door or similar obstruction (see “Access (to) ”). REGULATOR. A device for controlling and maintaining a uniform supply pressure, either pounds - to - inches water column (MP regulator) or inches - to - inches water column (appliance regulator). REGULATOR, GAS APPLIANCE. A pressure regulator for controlling pressure to the manifold of the appliance. Types of appliance regulators are as follows: Adjustable. 1. Spring type, limited adjustment. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, the loading of which is adjus table over a range of not more than 15 percent of the outlet pressure at the midpoint of the adjustment range. 2. Spring type, standard adjustment. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, th e loading of which is adjustable. The adjustment means shall be con- cealed. Multistage. A regulator for use with a single gas whose adjustment means is capable of being positioned manually or automatically to two or more predetermined outlet pressure settin gs. Each of these settings shall be adjustable or nonadjustable. The regulator may modulate outlet pressures automatically between its maximum and minimum predetermined outlet pressure settings. Nonadjustable. 1. Spring type, nonadjustable. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, the loading of which is not field adjustable. 2. Weight type. A regulator in which the regulating force acting upon the diaphragm is derived from a weight or combina tion of weights. REGULATOR, LINE GAS PRESSURE. A device placed in a gas line between the service pressure regulator and the appliance for controlling, maintaining or reducing the pressure in that portion of the piping system downstream of the device. REGUL ATOR, MEDIUM - PRESSURE (MP Regulator). A line pressure regulator that reduces gas pressure from the range of greater than 0.5 psig (3.4 kPa) and less than or equal to 5 psig (34.5 kPa) to a lower pressure. REGULATOR, PRESSURE. A device placed in a gas line for reducing, controlling and maintaining the pressure in that portion of the piping system downstream of the device. REGULATOR, SERVICE PRESSURE. A device installed by the serving gas supplier to reduce and limit the ser- vice line pressure to delivery pres sure. RELIEF OPENING. The opening provided in a draft hood to permit the ready escape to the atmosphere of the flue products from the draft hood in the event of no draft, back draft or stoppage beyond the draft hood, and to permit air into the draft hood i n the event of a strong chimney updraft. RELIEF VALVE (DEVICE). A safety valve designed to forestall the development of a dangerous condition by relieving either pressure, temperature or vacuum . RELIEF VALVE, PRESSURE. An automatic valve that opens and clo ses a relief vent, depending on whether the pressure is above or below a predetermined value. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 11 RELIEF VALVE, TEMPERATURE. Manual reset type. A valve that automatically opens a relief vent at a predetermined temperature and that must be manually returned to the closed position. Reseating or self - closing type. An automatic valve that opens and closes a relief vent, depending on whether the temperature is above or below a predetermined value. RELIEF VALVE, VACUUM. A valve that automatically opens and closes a v ent for relieving a vacuum within the hot water supply system, depending on whether the vacuum is above or below a predetermined value. RISER, GAS. A vertical pipe supplying fuel gas that extends one full story or more . ROOM HEATER, UNVENTED. See “Unvented room heater.” ROOM HEATER, VENTED. See “Vented room heater. ” ROUGH - IN. Parts of the gas system that are installed prior to the installation of appliances or equipment. This in- cludes gas piping, all the necessary supports and any appliances that are built into the structure. SAFETY SHUTOFF DEVICE. See “Flame safeguard.” SERVI CE PIPING. All fuel - gas piping, valves and fittings upstream of the point of delivery. SHAFT. An enclosed space extending through one or more stories of a building, connecting vertical openings in successive floors, or floors and the roof. SLEEPING UNIT. A dwelling unit, which may contain either toilet or kitchen facilities but not both. Any sleeping unit housing more than one family shall also be classified as a congregate living unit. The creation of or conversion to sleeping units shall be limited by Sec tion 27 - 2077 of the New York City Housing Maintenance Code . SPECIFIC GRAVITY. As applied to gas, specific gravity is the ratio of the weight of a given volume to that of the same volume of air, both measured under the same condition. STATIONARY FUEL CELL P OWER PLANT. A self - contained package or factory - matched packages that con- stitute an automatically operated assembly of integrated systems for generating electrical energy and recoverable ther- mal energy that is permanently connected and fixed in place. THER MOSTAT. Electric switch type. A device that senses changes in temperature and controls electrically, by means of separate components, the flow of gas to the burner(s) to maintain selected temperatures. Integral gas valve type. An automatic device, actuated by temperature changes, desi gned to control the gas supply to the burner(s) in order to maintain temperatures between predetermined limits, and in which the thermal actuating element is an integral part of the device. 1. Graduating thermostat. A thermostat in which the motion of the valve is approximately in direct proportion to the effective motion of the thermal element induced by temperature change. 2. Snap - acting thermostat. A thermostat in which the thermostatic valve travels instantly from the closed to the open position, and vi ce versa. THIRD - PARTY CERTIFICATION AGENCY. An approved agency operating a product or material certification system that incorporates initial product testing, assessment and surveillance of a manufacturer’s quality control sys- tem. THIRD - PARTY CERTIFIED. Ce rtification obtained by the manufacturer indicating that the function and perfor- mance characteristics of a product or material have been determined by testing and ongoing surveillance by an ap- proved third - party certification agency. Assertion of certificat ion is in the form of identification in accordance with the requirements of the third - party certification agency. THIRD - PARTY TESTED. Procedure by which an approved testing laboratory provides documentation that a prod- uct, material or system conforms to sp ecified requirements. DEFINITIONS 2 - 12 2022 NEW YORK CITY FUEL GAS CODE TRANSITION FITTINGS, PLASTIC TO STEEL. An adapter for joining plastic pipe to steel pipe. The purpose of this fitting is to provide a permanent, pressure - tight connection between two materials that cannot be joined directly one to ano ther. UNIT HEATER .High - static pressure type. A self - contained, automatically controlled, vented appliance having integral means for circulation of air against 0.2 inch (15 mm H 2 O) or greater static pressure. Such appliance is equipped with provisions for attaching an outlet air duct and, where the appliance is for indoor installation remote from the space to be heated, is also equipped with provisions for attaching an inlet air duct. Low - static pressure type. A self - contained, automatically controlled, ven ted appliance, intended for installation in the space to be heated without the use of ducts, having integral means for circulation of air. Such units are allowed to be equipped with louvers or face extensions made in accordance with the manufacturer’s spec ifications. UNLISTED BOILER. A boiler not listed by a nationally recognized testing agency. UNVENTED ROOM HEATER. An unvented heating appliance designed for stationary installation and utilized to provide comfort heating. Such appliance provides radiant he at or convection heat by gravity or fan circulation directly from the heater and does not utilize ducts. VALVE. A device used in piping to control the gas supply to any section of a system of piping or to an appliance. Appliance shutoff. A valve located in the piping system, used to isolate individual appliances for purposes such as service or replacement. Automatic. An automatic or semiautomatic device consisting essentially of a valve and operator that control the gas supply to the burner(s) during operat ion of an appliance. The operator shall be actuated by application of gas pressure on a flexible diaphragm, by electrical means, by mechanical means, or by other approved means. Automatic gas shutoff. A valve used in conjunction with an automatic gas shuto ff device to shut off the gas supply to a system . It shall be constructed integrally with the gas shutoff device or shall be a separate assembly. Individual main burner. A valve that controls the gas supply to an individual main burner. Main burner control. A valve that controls the gas supply to the main burner manifold. Manual main gas - control. A manually operated valve in the gas line for the purpose of completely turning on or shutting off the gas supply to the appliance, except to pilot or pilots that are provided with independent shutoff. Manual reset. An automatic shutoff valve installed in the gas supply piping and set to shut off when unsafe con- ditions occur. The device remains closed until manually reopened. Service shutoff. A valve, installed by the serving gas supplier between the service meter or source of supply and the customer pipin g system, to shut off the entire piping system. VENT. A pipe or other conduit composed of factory - made components, containing a passageway for conveying com- bustion products and air to the atmosphere, listed and labeled for use with a specific type or class of appliance. Special gas vent. A vent listed and labeled for use with listed Category II, III and IV appliances. Type B vent. A vent listed and labeled for use with appliances with draft hoods and other Category I appliances that are listed for use with Type B vents. Type BW vent. A vent listed and labeled for use with wall furnaces. Type L vent. A vent listed and labeled for use with appliances that are listed for use with Type L or Type B vents. VENT CONNECTOR. See “Connector. ” VENT GASES. Products of c ombustion from appliances plus excess air plus dilution air in the vent connector, gas vent or chimney above the draft hood or draft regulator. VENT PIPING. 2022 NEW YORK CITY FUEL GAS CODE 2 - 1 ‡‡‡ Chapter 2 was amended by Local Law 77 of 2023 . This law has an effective date of June 10, 2023. CHAPTER 2 DEFINITIONS SECTION FGC 201 GENERAL 201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code and standard, have the meanings indicated in this chapter. 201.2 Inter changeability. Words used in the present tense include the future; words in the masculine gender in- clude the feminine and neuter; the singular number includes the plural and the plural, the singular. 201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the New York City Electrical Code , New York City Building Code , New York City Fire Code , New York City Mechanical Code , New York City Plumbing Code , or the New York City Energy Conservation Code , such terms shall have meanings ascribed to them as in those codes. ‡‡‡ 201.3.1 Terms defined in the general administrative provisions. The following terms are defined in Sec- tion 28 - 101.5 of the Administrative Code : 1968 BUILDING CODE. 1968 OR PRIOR CODE BUILDINGS OR STRUCTURES (PRIOR CODE BUILDINGS). ACCEPTANCE OR ACCEPTED. ADDITION. ADMINISTRATIVE CODE. ALTERATION. APPROVAL OR APPROVED. APPROVED AGENCY. APPROVED FABRICATOR. APPROVED INSPECTION AGENCY. APPROVED TESTING AGENCY. ARCHITECT. BUILDING. CERTIFICATE OF COMPLIANCE. CHARTER. CITY. COMMISSIONER. CONSTRUCTION DOCUMENTS. DAY. DEFERRED SUBMITTAL. DEMOLITION. DEMOLITION, FULL. DEFINITIONS 2 - 2 2022 NEW YORK CITY FUEL GAS CODE DEMOLITION, PARTIAL. DEPARTMENT. ENGINEER. ENLARGEMENT. ENVIRONMENTAL CONTROL BOARD or ECB. EXISTING BUILDING OR STRUCTUR E. FABRICATED ITEM. FIRE PROTECTION PLAN. HEREAFTER. HERETOFORE. INSPECTION CERTIFICATE. INTERIM CERTIFICATE OF OCCUPANCY. LABEL. LABELED. LAND SURVEYOR. LANDSCAPE ARCHITECT. LETTER OF COMPLETION. LIMITED ALTERATION APPLICATION. LIMITED PLUMBING ALTERATIONS. LIMITED SPRINKLER ALTERATIONS. LIMITED STANDPIPE ALTERATIONS. LISTED. MAIN USE OR DOMINANT OCCUPANCY (OF A BUILDING). MANUFACTURER’S DESIGNATION. MARK. MATERIALS. OCCUPANCY. OWNER. PARTY WALL. PERMIT. PERSON. PREMISES. PRIOR CODE BUILDING. PROFESSIONAL CERTIFICATION. PROGRESS INSPECTION. PROJECT. REGISTERED DESIGN PROFESSIONAL. REGISTERED DESIGN PROFESSIONAL OF RECORD. REQUIRED. RETAINING WALL. SERVICE EQUIPMENT. SIGN - OFF. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 3 SINGLE ROOM OCCUPANCY MULTIPLE DWELLING. SPECIAL INSPECTION . SPECIAL INSPECTION AGENCY. SPECIAL INSPECTOR. STRUCTURE. SUBMITTAL DOCUMENTS. SUPERINTENDENT OF CONSTRUCTION (CONSTRUCTION SUPERINTENDENT). USE (USED). UTILITY COMPANY OR PUBLIC UTILITY COMPANY. UTILITY CORPORATION OR PUBLIC UTILITY CORPORATION. WORK NOT CONSTITUTING MINOR ALTERATIONS OR ORDINARY REPAIRS. WRITING (WRITTEN). WRITTEN NOTICE. ZONING RESOLUTION. 201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have ordin arily accepted meanings such as the context implies. ‡‡‡ SECTION FGC 202 GENERAL DEFINITIONS ABNORMAL OPERATING CONDITION. A condition that may indicate a malfunction or a noncompliant com- ponent of a piping system or appliance. ACCESS (TO). That which enables a device, fixture, appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel, door or similar obstruction (see also “Ready access (to) ”). AIR CONDITIONER, GAS - FIRED. A gas - b urning, automatically operated appliance for supplying cooled or dehumidified air or chilled liquid. AIR CONDITIONING. The treatment of air so as to control simultaneously the temperature, humidity, cleanness and distribution of the air to meet the require ments of a conditioned space. AIR, EXHAUST. See “Exhaust.” AIR - HANDLING UNIT. A blower or fan used for the purpose of distributing supply air to a room, space or area. AIR, MAKEUP. Any combination of outdoor and transfer air intended to replace exhaust air and exfiltration. APPLIANCE. Any apparatus or device that utilizes a fuel or raw material to produce light, heat, power, refrigeration or air conditioning. APPLIANCE, AUTOMATICALLY CONTROLLED. Appliances equipped with an automatic b urner ignition and safety shutoff device and other automatic devices which accomplish complete turn - on and shutoff of the gas to the main burner or burners, and graduate the gas supply to the burner or burners, but do not affect complete shutoff of the gas . APPLIANCE TYPE. Low - heat appliance (residential appliance). Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of 1,000 ° F (538 ° C) or less. Medium - heat appliance. Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of more than 1,000 ° F (538 ° C ) or less but not greater than 2,000 ° F ( 1093 .3° C). DEFINITIONS 2 - 4 2022 NEW YORK CITY FUEL GAS CODE APPLIANCE, UNVENTED. An appliance designed or installed in such a manner that the products of combustion are not conveyed by a vent or chimney directly to the outdoor atmosphere. APPLIANCE, VENTED. An appliance designed and installed in such a manner that all of the products o f com- bustion are conveyed directly from the appliance to the outdoor atmosphere through an approved chimney or vent system. See also “VENTED APPLIANCE CATEGORIES.” ATMOSPHERIC PRESSURE. The pressure of the weight of air and water vapor on the surface of th e earth, ap- proximately 14.7 pounds per square inch (psi) (101 kPa absolute) at sea level. BAFFLE. An object placed in an appliance to change the direction of or retard the flow of air, air - gas mixtures or flue gases. BAROMETRIC DRAFT REGULATOR. A balanced damper device attached to a chimney, vent connector, breeching or flue gas manifold to protect combustion appliances by controlling chimney draft. A double - acting barometric draft regulator is one in which the balancing damper is free to move in either direction to protect combustion appliances from both excessive draft and backdraft. BOILER, HIGH - PRESSURE. An appliance for supplying steam or hot water that, for a steam boiler, operates at a pressure of more than 15 psig ( 103.4 kPa gauge), and for a hot water boiler, operates at a pressure exceeding 160 psig ( 1103 kPa gauge) or at a temperature exceeding 250° F ( 121.1 °C). BOILER, LOW - PRESSURE. A self - contained appliance for supplying steam or hot water as follows: Hot water heating boiler. A boiler in which no steam is generated, from which hot water is circulated for heating purposes and then returned to the boiler, and that operates at water pressures not exceeding 160 pounds per square inch gauge (psig) ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Hot water supply boiler. A boiler, completely fill ed with water, which furnishes hot water to be used externally to itself, and that operates at water pressures not exceeding 160 psig ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Steam heating boile r. A boiler in which steam is generated and that operates at a steam pressure not exceeding 15 psig ( 103.4 kPa gauge). BRANCH. A section of gas piping downstream from a riser, leading to appliances or equipment on no more than two consecutive floors. BRAZING. A metal - joining process wherein coalescence is produced by the use of a nonferrous filler metal having a melting point above 1,000°F ( 537.8 ° C), but lower than that of the base metal being joined. The filler material is distributed between the clos ely fitted surfaces of the joint by capillary action. BROILER. A general term including salamanders, barbecues and other appliances cooking primarily by radiated heat, excepting toasters. BTU. Abbreviation for British thermal unit, which is the quantity of heat required to raise the temperature of 1 pound (454 g) of water 1°F ( - 17.2 ° C) (1 Btu = 1055 J). BURNER. A device for the final conveyance of the gas, or a mixture of gas and air, to the combustion zone. Induced draft. A burner that depends on draft induced by a fan that is an integral part of the appliance and is located downstream from the burner. Power. A burner in which gas, air or both are supplied at pressures exceeding, for gas, the line pressure, and for air, atmospheric pressure, with t his added pressure being applied at the burner. CHIMNEY. A primarily vertical structure containing one or more flues used to remove hot gases from burning fuel, refuse, or industrial processes from a fuel - burning appliance to the outdoor atmosphere. Factor y - built chimney. A listed and labeled chimney composed of factory - made components, assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 5 Masonry chimney. A field - constructed chimney composed of solid mason ry units, bricks, stones or concrete. Metal chimney. A field - constructed chimney composed of metal. CLEARANCE. The minimum distance through air measured between the heat - producing surface of the mechanical appliance, device or equipment and the surface of the combustible material or assembly. CLOTHES DRYER. An appliance used to dry wet laundry by means of heated air. Dryer classifications are as follows: Type 1. Factory - built package, multiple production. Primarily used in family living environment. Usually the smallest unit physically and in function output. Type 2. Factory - built package, multiple production. Used in business with direct intercourse of the functi on with the public. Not designed for use in individual family living environment. COMBUSTIBLE ASSEMBLY. Wall, floor, ceiling or other assembly constructed of one or more component mate- rials that are not defined as noncombustible. COMBUSTIBLE MATERIAL. Any material not defined as noncombustible. COMBUSTION. In the context of this code, refers to the rapid oxidation of fuel accompanied by the production of heat or heat and light. COMBUSTION AIR . Air necessary for complete combustion of a fuel, including theor etical air and excess air. COMBUSTION CHAMBER. The portion of an appliance within which combustion occurs. COMBUSTION PRODUCTS. Constituents resulting from the combustion of a fuel with the oxygen of the air, including inert gases, but excluding excess air. CONCEALED LOCATION. A location that cannot be accessed without damaging permanent parts of the building structure or finished surface. Spaces above, below or behind readily removable panels or doors shall not be considered as concealed. CONCEAL ED PIPING. Piping that is located in a concealed location (see “Concealed location ”). CONDENSATE. The liquid that condenses from a gas (including flue gas) caused by a reduction in temperature or increase in pressure. CONNECTOR, APPLIANCE (Fuel). Rigid metallic pipe and fittings or a listed and labeled device that connects an appliance to the gas piping system. CONNECTOR, CHIMNEY OR VENT. The pipe that connects an appliance to a chimney or vent. CONTROL. A manual or automatic device designed to re gulate the gas, air, water or electrical supply to, or operation of, a mechanical system. CONVERSION BURNER. A unit consisting of a burner and its controls for installation in an appliance originally uti- lizing another fuel. COUNTER APPLIANCES. Appliances s uch as coffee brewers and coffee urns and any appurtenant water - heating ap- pliance, food and dish warmers, hot plates, griddles, waffle bakers and other appliances designed for installation on or in a counter. CUBIC FOOT. The amount of gas that occupies 1 c ubic foot (0.02832 m 3 ) when at a temperature of 60°F ( 15.6 ° C), saturated with water vapor and under a pressure equivalent to that of 30 inches of mercury (101 kPa). DAMPER. A manually or automatically controlled device to regulate draft or the rate of flow of air or combustion gases. DECORATIVE APPLIANCE, VENTED. A vented appliance wherein the primary function lies in the aesthetic effect of the flames. DEFINITIONS 2 - 6 2022 NEW YORK CITY FUEL GAS CODE DECORATIVE APPLIANCES FOR INSTALLATION IN VENTED FIREPLACES. A vented appliance de- signed for installa tion within the fire chamber of a vented fireplace, wherein the primary function lies in the aesthetic effect of the flames. DECORATIVE SHROUD. A listed, partial, noncombustible enclosure for aesthetic purposes that is installed at the termination of a ven ting system that surrounds or conceals a factory - built chimney system or vent cap. DEMAND. The maximum amount of gas input required per unit of time, usually expressed in cubic feet per hour (1 ft 3 = 0.0283 m 3 ), or Btu/h (1 Btu/h = 0.2931 W). DILUTION AIR. Air that is introduced into a draft hood and is mixed with the flue gases. DIRECT - VENT APPLIANCES. Appliances that are constructed and installed so that all air for combustion is derived directly from the outdo or atmosphere and all flue gases are discharged directly to the outdoor atmosphere. DRAFT. The pressure difference existing between the appliance or any component part and the atmosphere, that causes a continuous flow of air and products of combustion thro ugh the gas passages of the appliance to the atmos- phere. Induced draft. The pressure difference created by the action of a fan, blower or ejector, that is located between the appliance and the chimney or vent termination. Natural draft. The pressure difference created by a vent or chimney because of its height, and the temperature difference between the flue gases and the atmosphere. DRAFT HOOD. A nonadjustable device built into an appliance, or made as part of the vent connector from an appl iance, that is designed to (1) provide for ready escape of the flue gases from the appliance in the event of no draft, backdraft or stoppage beyond the draft hood, (2) prevent a backdraft from entering the appliance, and (3) neutralize the effect of stack action of the chimney or gas vent upon operation of the appliance. DRAFT REGULATOR. A device that functions to maintain a desired draft in the appliance by automatically reducing the draft to the desired value. DRIP. A nipple and cap placed at a low point in a system of piping to collect condensate and from which the conden- sate is removable. DRY GAS. A gas having a moisture and hydrocarbon dew point below any normal temperature to which the gas piping is exposed. DUCT FURNACE. A warm - air furnace or heater n ormally installed in an air distribution duct to supply warm air for heating. This definition shall apply only to a warm - air heating appliance that, for air circulation, depends on a blower not furnished as part of the furnace. DUCT SYSTEM. A continuous pa ssageway for the transmission of air that, in addition to ducts, includes duct fittings, dampers, plenums, fans and accessory air - handling equipment and appliances . DWELLING. A building or structure which is occupied in whole or in part as the home, residence or sleeping place of one or more families. DWELLING UNIT. A single unit consisting of one or more habitable rooms and occupied or arranged to be occupied as a unit separa te from all other units within a dwelling. EQUIPMENT. Any apparatus or device that delivers gas as a fuel or raw material to an appliance or vents combustion products from an appliance, including but not limited to control devices, pressure regulators, val ves, appliance appurtenances, gas connectors, or power exhausters used in connections to appliances. EXCESS FLOW VALVE (EFV). A safety shut - off valve designed to activate to interrupt the flow of gas when the fuel gas passing through it exceeds a prescribe d flow rate. Installed where specifically required by code or utility company. EXHAUST. Air being removed from any space, appliance or piece of equipment conveyed directly to the atmosphere by means of openings or ducts. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 7 EXTERIOR MASONRY CHIMNEYS. Masonry chimneys exposed to the outdoors on one or more sides below the roof line. FIREPLACE. An assembly consisting of a hearth and fire chamber of noncombustible material and provided with a chimney , for use with solid fuels. Factory - built fireplace. A listed and labeled fireplace and chimney system composed of factory - made compo- nents , and assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. Masonry fireplace. A hearth and fire chamber of s olid masonry units such as bricks, stones, listed masonry units or reinforced concrete, provided with a suitable chimney. FLAME SAFEGUARD. A device that will automatically shut off the fuel supply to a main burner or group of burners when the means of igni tion of such burners becomes inoperative, and when flame failure occurs on the burner or group of burners. FLASHBACK ARRESTOR CHECK VALVE. A device that will prevent the backflow of one gas into the supply system of another gas and prevent the passage of flame into the gas supply system. FLOOR FURNACE. A completely self - contained furnace suspended from the floor of the space being heated, ta king air for combustion from outside such space and with means for observing flames and lighting the appliance from such space. Fan type. A floor furnace equipped with a fan that provides the primary means for circulating air. Gravity type. A floor furnace depending primarily on circulation of air by gravity. This classification shall also include floor furnaces equipped with booster - type fans that do not materially restrict free circulation of air by gravity flow when such fans are not in operation. FLUE. A passageway within a chimney or vent through which gaseous combustion products pass. FLUE, APPLIANCE. The passage(s) within an appliance through which combustion products pass from the combustion chamber of the appliance to the draft hood inlet opening on an appliance equipped with a draft hood or to the outlet of the appliance on an appliance not equipped with a draft hood. FLUE COLLAR. That portion of an appliance designed for the attachment of a draft hood, vent connector or venting system. FL UE GASES. Products of combustion plus excess air in fireplace and appliance flues or heat exchangers. FLUE LINER (LINING). A system or material used to form the inside surface of a flue in a chimney or vent, for the purpose of protecting the surrounding st ructure from the effects of combustion products and for conveying combustion products without leakage into the atmosphere. FUEL GAS. A natural gas, manufactured gas, liquefied petroleum gas or mixtures of these gases. FURNACE. A completely self - contained h eating unit that is designed to supply heated air to spaces remote from or adjacent to the appliance location. FURNACE, CENTRAL. A self - contained appliance for heating air by transfer of heat of combustion through metal to the air, and designed to supply h eated air through ducts to spaces remote from or adjacent to the appliance location. Forced - air type. A central furnace equipped with a fan or blower that provides the primary means for circulation of air. FURNACE PLENUM. An air compartment or chamber to which one or more ducts are connected and that forms part of an air distribution system. GAS CONVENIENCE OUTLET. A permanently mounted, manually operated device that provides the means for connecting an appliance to, and d isconnecting an appliance from, the supply piping. The device includes an integral, manually operated valve with a nondisplaceable valve member and is designed so that disconnection of an appliance only occurs when the manually operated valve is in the clo sed position. DEFINITIONS 2 - 8 2022 NEW YORK CITY FUEL GAS CODE GAS PIPING. An installation of pipe, valves or fittings installed on a premises or in a building and utilized to convey fuel gas. GAS UTILIZATION EQUIPMENT. An appliance that utilizes gas as a fuel or raw material or both. HAZARDOUS LOCATION. Any location considered to be a fire hazard for flammable vapors, dust, combustible fibers or other highly combustible substances. The location is not necessarily categorized in the New York City Building Code as a high - hazard group classification. HOUSE PIPING. See “Piping system.” HYDROGEN FUEL GAS ROOM. A separately ventilated, fully enclosed room designed to exclusively house the generation of gaseous hydrogen for immediate on - premises use in indoor fuel cells or other energy production process, and incidental indoor storage of gaseous hydrogen. A hydro gen fuel gas room is not intended to house the production or dispensing of hydrogen motor fuel. IGNITION SOURCE. A flame, spark or hot surface capable of igniting flammable vapors or fumes. Such sources include appliance burners, burner ignitors, and elect rical switching devices. INCINERATOR. An appliance used to reduce combustible refuse material to ashes and that is manufactured, sold and installed as a complete unit. INDUSTRIAL AIR HEATERS, NONRECIRCULATING DIRECT - FIRED . A heater in which all the product s of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating only outdoor air. INDUSTRIAL AIR HEATERS, RECIRCULATING DIRECT - FIRED . A heater in which all the pro ducts of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating outdoor air, and, if applicable, indoor air. INFRARED RADIANT HEATER. A heater that directs a s ubstantial amount of its energy output in the form of infrared radiant energy into the area to be heated. Such heaters are of either the vented or unvented type. INTEGRAL VENT APPLIANCES. Appliances designed for outdoor installation that have built - in natu ral or me- chanical venting means and are constructed and installed so that all air for combustion is derived from the outdoor atmosphere and all flue gases are discharged to the outdoor atmosphere through an integral vent termination. INTERLOCK. A device actuated by another device with which it is directly associated, to govern succeeding oper- ations of the same or allied devices. A circuit in which a given action cannot occur until after one or more other actions have taken place. JOINT, FLANGED. A joint made by bolting together a pair of flanged ends. JOINT, FLARED. A metal - to - metal compression joint in which a conical spread is made on the end of a tube that is compressed by a flare nut against a mating flare. JOINT, MECHANICAL. A general form o f gas - tight joints obtained by the joining of metal parts through a positive - holding mechanical construction, such as press joint, flanged joint, threaded joint, flared joint or compression joint. JOINT, PLASTIC ADHESIVE. A joint made in thermoset plastic piping by the use of an adhesive substance that forms a continuous bond between the mating surfaces without dissolving either one of them. JOINT, PLASTIC HEAT FUSION. A joint made in thermoplastic piping by heating the parts sufficiently to permit fusion o f the materials when the parts are pressed together. JOINT, WELDED. A gas - tight joint obtained by the joining of metal parts in molten state. LEAK CHECK. An operation performed on a gas piping system to verify that the system does not leak. Leakage checks are intended to discover open outlets, defective appliance connection and defects that have developed since the initial installation, normally performed after pressure testing. LIMIT CONTROL. A device responsive to changes in pressure, temperature or level for turning on, shutting off or throttling the gas supply to an appliance. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 9 LIQUEFIED PETROLEUM GAS or LPG (LP - GAS). Liquefied petroleum gas composed predominately of pro- pane, propylene, buta nes or butylenes, or mixtures thereof that is gaseous under normal atmospheric conditions, but is capable of being liquefied under moderate pressure at normal temperatures. LIVING SPACE. Space within a dwelling unit utilized for living, sleeping, eating, c ooking, bathing, washing and sanitation purposes. LOG LIGHTER. A manually operated solid fuel ignition appliance for installation in a vented solid fuel - burning fireplace. MAIN BURNER. A device or group of devices essentially forming an integral unit for t he final conveyance of gas or a mixture of gas and air to the combustion zone, and in which combustion takes place to accomplish the function for which the appliance is designed. METER. The instrument installed to measure the volume of gas delivered throug h it. NPS. An abbreviation for “Nominal pipe size.” NONCOMBUSTIBLE MATERIALS. Materials that, when tested in accordance with ASTM E 136, have at least three of four specimens tested meeting all of the following criteria: 1. The recorded temperature of the surface and interior thermocouples shall not at any time during the test rise more than 54ºF (12.2ºC) above the furnace temperature at the beginning of the test. 2. There shall not be flaming from the specimen after the first 30 seconds. 3. If the weight l oss of the specimen during testing exceeds 50 percent, the recorded temperature of the surface and interior thermocouples shall not at any time during the test rise above the furnace air temperature at the beginning of the test, and there shall not be flam ing of the specimen. OFFSET (VENT). A combination of approved bends that makes two changes in direction bringing one section of the vent out of line but into a line parallel with the other section. ORIFICE. The opening in a cap, spud or other device whereb y the flow of gas is limited and through which the gas is discharged to the burner. OUTLET. The point at which a gas - fired appliance connects to the gas piping system. OXYGEN DEPLETION SAFETY SHUTOFF SYSTEM (ODS). A system designed to act to shut off the g as sup- ply to the main and pilot burners if the oxygen in the surrounding atmosphere is reduced below a predetermined level. PILOT. A small flame that is utilized to ignite the gas at the main burner or burners. PIPING. Where used in this code, “piping” refers to either pipe or tubing, or both. Pipe. A rigid conduit of iron, steel, copper, brass or plastic. Tubing. Semirigid conduit of copper, aluminum, plastic or steel. PIPING SYSTEM. All fuel piping, valves and fitting s from the outlet of the point of delivery to the outlets of the appliance shutoff valves. PLASTIC, THERMOPLASTIC. A plastic that is capable of being repeatedly softened by increase of temperature and hardened by decrease of temperature. POINT OF DELIVERY. For natural gas systems, the point of delivery is the outlet of the service meter assembly or the outlet of the service regulator or service shutoff valve where a meter is not provided. Where a valve is provided at the outlet of the service meter assembly, such valve shall be considered to be downstream of the point of delivery. PORTABLE FUEL CELL APPLIANCE. A fuel cell generator of electricity, which is not fixed in place. A portable fuel cell appliance utilizes a cord and plug connection to a gr id - isolated load and has an integral fuel supply. PRESSURE DROP. The loss in pressure due to friction or obstruction in pipes, valves, fittings, regulators and burn- ers. DEFINITIONS 2 - 10 2022 NEW YORK CITY FUEL GAS CODE PRESSURE TEST. An operation performed to verify the gas - tight integrity of gas piping f ollowing its installation or modification. PURGE. To free a gas conduit of air or gas, or a mixture of gas and air. QUICK - DISCONNECT DEVICE. A hand - operated device that provides a means for connecting and disconnecting an appliance or an appliance connecto r to a gas supply and that is equipped with an automatic means to shut off the gas supply when the device is disconnected. READY ACCESS (TO). That which enables a device, fixture, appliance or equipment to be directly reached, without requiring the removal or movement of any panel, door or similar obstruction (see “Access (to) ”). REGULATOR. A device for controlling and maintaining a uniform supply pressure, either pounds - to - inches water column (MP regulator) or inches - to - inches water column (appliance regulator). REGULATOR, GAS APPLIANCE. A pressure regulator for controlling pressure to the manifold of the appliance. Types of appliance regulators are as follows: Adjustable. 1. Spring type, limited adjustment. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, the loading of which is adjus table over a range of not more than 15 percent of the outlet pressure at the midpoint of the adjustment range. 2. Spring type, standard adjustment. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, th e loading of which is adjustable. The adjustment means shall be con- cealed. Multistage. A regulator for use with a single gas whose adjustment means is capable of being positioned manually or automatically to two or more predetermined outlet pressure settin gs. Each of these settings shall be adjustable or nonadjustable. The regulator may modulate outlet pressures automatically between its maximum and minimum predetermined outlet pressure settings. Nonadjustable. 1. Spring type, nonadjustable. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, the loading of which is not field adjustable. 2. Weight type. A regulator in which the regulating force acting upon the diaphragm is derived from a weight or combina tion of weights. REGULATOR, LINE GAS PRESSURE. A device placed in a gas line between the service pressure regulator and the appliance for controlling, maintaining or reducing the pressure in that portion of the piping system downstream of the device. REGUL ATOR, MEDIUM - PRESSURE (MP Regulator). A line pressure regulator that reduces gas pressure from the range of greater than 0.5 psig (3.4 kPa) and less than or equal to 5 psig (34.5 kPa) to a lower pressure. REGULATOR, PRESSURE. A device placed in a gas line for reducing, controlling and maintaining the pressure in that portion of the piping system downstream of the device. REGULATOR, SERVICE PRESSURE. A device installed by the serving gas supplier to reduce and limit the ser- vice line pressure to delivery pres sure. RELIEF OPENING. The opening provided in a draft hood to permit the ready escape to the atmosphere of the flue products from the draft hood in the event of no draft, back draft or stoppage beyond the draft hood, and to permit air into the draft hood i n the event of a strong chimney updraft. RELIEF VALVE (DEVICE). A safety valve designed to forestall the development of a dangerous condition by relieving either pressure, temperature or vacuum . RELIEF VALVE, PRESSURE. An automatic valve that opens and clo ses a relief vent, depending on whether the pressure is above or below a predetermined value. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 11 RELIEF VALVE, TEMPERATURE. Manual reset type. A valve that automatically opens a relief vent at a predetermined temperature and that must be manually returned to the closed position. Reseating or self - closing type. An automatic valve that opens and closes a relief vent, depending on whether the temperature is above or below a predetermined value. RELIEF VALVE, VACUUM. A valve that automatically opens and closes a v ent for relieving a vacuum within the hot water supply system, depending on whether the vacuum is above or below a predetermined value. RISER, GAS. A vertical pipe supplying fuel gas that extends one full story or more . ROOM HEATER, UNVENTED. See “Unvented room heater.” ROOM HEATER, VENTED. See “Vented room heater. ” ROUGH - IN. Parts of the gas system that are installed prior to the installation of appliances or equipment. This in- cludes gas piping, all the necessary supports and any appliances that are built into the structure. SAFETY SHUTOFF DEVICE. See “Flame safeguard.” SERVI CE PIPING. All fuel - gas piping, valves and fittings upstream of the point of delivery. SHAFT. An enclosed space extending through one or more stories of a building, connecting vertical openings in successive floors, or floors and the roof. SLEEPING UNIT. A dwelling unit, which may contain either toilet or kitchen facilities but not both. Any sleeping unit housing more than one family shall also be classified as a congregate living unit. The creation of or conversion to sleeping units shall be limited by Sec tion 27 - 2077 of the New York City Housing Maintenance Code . SPECIFIC GRAVITY. As applied to gas, specific gravity is the ratio of the weight of a given volume to that of the same volume of air, both measured under the same condition. STATIONARY FUEL CELL P OWER PLANT. A self - contained package or factory - matched packages that con- stitute an automatically operated assembly of integrated systems for generating electrical energy and recoverable ther- mal energy that is permanently connected and fixed in place. THER MOSTAT. Electric switch type. A device that senses changes in temperature and controls electrically, by means of separate components, the flow of gas to the burner(s) to maintain selected temperatures. Integral gas valve type. An automatic device, actuated by temperature changes, desi gned to control the gas supply to the burner(s) in order to maintain temperatures between predetermined limits, and in which the thermal actuating element is an integral part of the device. 1. Graduating thermostat. A thermostat in which the motion of the valve is approximately in direct proportion to the effective motion of the thermal element induced by temperature change. 2. Snap - acting thermostat. A thermostat in which the thermostatic valve travels instantly from the closed to the open position, and vi ce versa. THIRD - PARTY CERTIFICATION AGENCY. An approved agency operating a product or material certification system that incorporates initial product testing, assessment and surveillance of a manufacturer’s quality control sys- tem. THIRD - PARTY CERTIFIED. Ce rtification obtained by the manufacturer indicating that the function and perfor- mance characteristics of a product or material have been determined by testing and ongoing surveillance by an ap- proved third - party certification agency. Assertion of certificat ion is in the form of identification in accordance with the requirements of the third - party certification agency. THIRD - PARTY TESTED. Procedure by which an approved testing laboratory provides documentation that a prod- uct, material or system conforms to sp ecified requirements. DEFINITIONS 2 - 12 2022 NEW YORK CITY FUEL GAS CODE TRANSITION FITTINGS, PLASTIC TO STEEL. An adapter for joining plastic pipe to steel pipe. The purpose of this fitting is to provide a permanent, pressure - tight connection between two materials that cannot be joined directly one to ano ther. UNIT HEATER .High - static pressure type. A self - contained, automatically controlled, vented appliance having integral means for circulation of air against 0.2 inch (15 mm H 2 O) or greater static pressure. Such appliance is equipped with provisions for attaching an outlet air duct and, where the appliance is for indoor installation remote from the space to be heated, is also equipped with provisions for attaching an inlet air duct. Low - static pressure type. A self - contained, automatically controlled, ven ted appliance, intended for installation in the space to be heated without the use of ducts, having integral means for circulation of air. Such units are allowed to be equipped with louvers or face extensions made in accordance with the manufacturer’s spec ifications. UNLISTED BOILER. A boiler not listed by a nationally recognized testing agency. UNVENTED ROOM HEATER. An unvented heating appliance designed for stationary installation and utilized to provide comfort heating. Such appliance provides radiant he at or convection heat by gravity or fan circulation directly from the heater and does not utilize ducts. VALVE. A device used in piping to control the gas supply to any section of a system of piping or to an appliance. Appliance shutoff. A valve located in the piping system, used to isolate individual appliances for purposes such as service or replacement. Automatic. An automatic or semiautomatic device consisting essentially of a valve and operator that control the gas supply to the burner(s) during operat ion of an appliance. The operator shall be actuated by application of gas pressure on a flexible diaphragm, by electrical means, by mechanical means, or by other approved means. Automatic gas shutoff. A valve used in conjunction with an automatic gas shuto ff device to shut off the gas supply to a system . It shall be constructed integrally with the gas shutoff device or shall be a separate assembly. Individual main burner. A valve that controls the gas supply to an individual main burner. Main burner control. A valve that controls the gas supply to the main burner manifold. Manual main gas - control. A manually operated valve in the gas line for the purpose of completely turning on or shutting off the gas supply to the appliance, except to pilot or pilots that are provided with independent shutoff. Manual reset. An automatic shutoff valve installed in the gas supply piping and set to shut off when unsafe con- ditions occur. The device remains closed until manually reopened. Service shutoff. A valve, installed by the serving gas supplier between the service meter or source of supply and the customer pipin g system, to shut off the entire piping system. VENT. A pipe or other conduit composed of factory - made components, containing a passageway for conveying com- bustion products and air to the atmosphere, listed and labeled for use with a specific type or class of appliance. Special gas vent. A vent listed and labeled for use with listed Category II, III and IV appliances. Type B vent. A vent listed and labeled for use with appliances with draft hoods and other Category I appliances that are listed for use with Type B vents. Type BW vent. A vent listed and labeled for use with wall furnaces. Type L vent. A vent listed and labeled for use with appliances that are listed for use with Type L or Type B vents. VENT CONNECTOR. See “Connector. ” VENT GASES. Products of c ombustion from appliances plus excess air plus dilution air in the vent connector, gas vent or chimney above the draft hood or draft regulator. VENT PIPING. 2022 NEW YORK CITY FUEL GAS CODE 2 - 1 ‡‡‡ Chapter 2 was amended by Local Law 77 of 2023 . This law has an effective date of June 10, 2023. CHAPTER 2 DEFINITIONS SECTION FGC 201 GENERAL 201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code and standard, have the meanings indicated in this chapter. 201.2 Inter changeability. Words used in the present tense include the future; words in the masculine gender in- clude the feminine and neuter; the singular number includes the plural and the plural, the singular. 201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the New York City Electrical Code , New York City Building Code , New York City Fire Code , New York City Mechanical Code , New York City Plumbing Code , or the New York City Energy Conservation Code , such terms shall have meanings ascribed to them as in those codes. ‡‡‡ 201.3.1 Terms defined in the general administrative provisions. The following terms are defined in Sec- tion 28 - 101.5 of the Administrative Code : 1968 BUILDING CODE. 1968 OR PRIOR CODE BUILDINGS OR STRUCTURES (PRIOR CODE BUILDINGS). ACCEPTANCE OR ACCEPTED. ADDITION. ADMINISTRATIVE CODE. ALTERATION. APPROVAL OR APPROVED. APPROVED AGENCY. APPROVED FABRICATOR. APPROVED INSPECTION AGENCY. APPROVED TESTING AGENCY. ARCHITECT. BUILDING. CERTIFICATE OF COMPLIANCE. CHARTER. CITY. COMMISSIONER. CONSTRUCTION DOCUMENTS. DAY. DEFERRED SUBMITTAL. DEMOLITION. DEMOLITION, FULL. DEFINITIONS 2 - 2 2022 NEW YORK CITY FUEL GAS CODE DEMOLITION, PARTIAL. DEPARTMENT. ENGINEER. ENLARGEMENT. ENVIRONMENTAL CONTROL BOARD or ECB. EXISTING BUILDING OR STRUCTUR E. FABRICATED ITEM. FIRE PROTECTION PLAN. HEREAFTER. HERETOFORE. INSPECTION CERTIFICATE. INTERIM CERTIFICATE OF OCCUPANCY. LABEL. LABELED. LAND SURVEYOR. LANDSCAPE ARCHITECT. LETTER OF COMPLETION. LIMITED ALTERATION APPLICATION. LIMITED PLUMBING ALTERATIONS. LIMITED SPRINKLER ALTERATIONS. LIMITED STANDPIPE ALTERATIONS. LISTED. MAIN USE OR DOMINANT OCCUPANCY (OF A BUILDING). MANUFACTURER’S DESIGNATION. MARK. MATERIALS. OCCUPANCY. OWNER. PARTY WALL. PERMIT. PERSON. PREMISES. PRIOR CODE BUILDING. PROFESSIONAL CERTIFICATION. PROGRESS INSPECTION. PROJECT. REGISTERED DESIGN PROFESSIONAL. REGISTERED DESIGN PROFESSIONAL OF RECORD. REQUIRED. RETAINING WALL. SERVICE EQUIPMENT. SIGN - OFF. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 3 SINGLE ROOM OCCUPANCY MULTIPLE DWELLING. SPECIAL INSPECTION . SPECIAL INSPECTION AGENCY. SPECIAL INSPECTOR. STRUCTURE. SUBMITTAL DOCUMENTS. SUPERINTENDENT OF CONSTRUCTION (CONSTRUCTION SUPERINTENDENT). USE (USED). UTILITY COMPANY OR PUBLIC UTILITY COMPANY. UTILITY CORPORATION OR PUBLIC UTILITY CORPORATION. WORK NOT CONSTITUTING MINOR ALTERATIONS OR ORDINARY REPAIRS. WRITING (WRITTEN). WRITTEN NOTICE. ZONING RESOLUTION. 201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have ordin arily accepted meanings such as the context implies. ‡‡‡ SECTION FGC 202 GENERAL DEFINITIONS ABNORMAL OPERATING CONDITION. A condition that may indicate a malfunction or a noncompliant com- ponent of a piping system or appliance. ACCESS (TO). That which enables a device, fixture, appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel, door or similar obstruction (see also “Ready access (to) ”). AIR CONDITIONER, GAS - FIRED. A gas - b urning, automatically operated appliance for supplying cooled or dehumidified air or chilled liquid. AIR CONDITIONING. The treatment of air so as to control simultaneously the temperature, humidity, cleanness and distribution of the air to meet the require ments of a conditioned space. AIR, EXHAUST. See “Exhaust.” AIR - HANDLING UNIT. A blower or fan used for the purpose of distributing supply air to a room, space or area. AIR, MAKEUP. Any combination of outdoor and transfer air intended to replace exhaust air and exfiltration. APPLIANCE. Any apparatus or device that utilizes a fuel or raw material to produce light, heat, power, refrigeration or air conditioning. APPLIANCE, AUTOMATICALLY CONTROLLED. Appliances equipped with an automatic b urner ignition and safety shutoff device and other automatic devices which accomplish complete turn - on and shutoff of the gas to the main burner or burners, and graduate the gas supply to the burner or burners, but do not affect complete shutoff of the gas . APPLIANCE TYPE. Low - heat appliance (residential appliance). Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of 1,000 ° F (538 ° C) or less. Medium - heat appliance. Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of more than 1,000 ° F (538 ° C ) or less but not greater than 2,000 ° F ( 1093 .3° C). DEFINITIONS 2 - 4 2022 NEW YORK CITY FUEL GAS CODE APPLIANCE, UNVENTED. An appliance designed or installed in such a manner that the products of combustion are not conveyed by a vent or chimney directly to the outdoor atmosphere. APPLIANCE, VENTED. An appliance designed and installed in such a manner that all of the products o f com- bustion are conveyed directly from the appliance to the outdoor atmosphere through an approved chimney or vent system. See also “VENTED APPLIANCE CATEGORIES.” ATMOSPHERIC PRESSURE. The pressure of the weight of air and water vapor on the surface of th e earth, ap- proximately 14.7 pounds per square inch (psi) (101 kPa absolute) at sea level. BAFFLE. An object placed in an appliance to change the direction of or retard the flow of air, air - gas mixtures or flue gases. BAROMETRIC DRAFT REGULATOR. A balanced damper device attached to a chimney, vent connector, breeching or flue gas manifold to protect combustion appliances by controlling chimney draft. A double - acting barometric draft regulator is one in which the balancing damper is free to move in either direction to protect combustion appliances from both excessive draft and backdraft. BOILER, HIGH - PRESSURE. An appliance for supplying steam or hot water that, for a steam boiler, operates at a pressure of more than 15 psig ( 103.4 kPa gauge), and for a hot water boiler, operates at a pressure exceeding 160 psig ( 1103 kPa gauge) or at a temperature exceeding 250° F ( 121.1 °C). BOILER, LOW - PRESSURE. A self - contained appliance for supplying steam or hot water as follows: Hot water heating boiler. A boiler in which no steam is generated, from which hot water is circulated for heating purposes and then returned to the boiler, and that operates at water pressures not exceeding 160 pounds per square inch gauge (psig) ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Hot water supply boiler. A boiler, completely fill ed with water, which furnishes hot water to be used externally to itself, and that operates at water pressures not exceeding 160 psig ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Steam heating boile r. A boiler in which steam is generated and that operates at a steam pressure not exceeding 15 psig ( 103.4 kPa gauge). BRANCH. A section of gas piping downstream from a riser, leading to appliances or equipment on no more than two consecutive floors. BRAZING. A metal - joining process wherein coalescence is produced by the use of a nonferrous filler metal having a melting point above 1,000°F ( 537.8 ° C), but lower than that of the base metal being joined. The filler material is distributed between the clos ely fitted surfaces of the joint by capillary action. BROILER. A general term including salamanders, barbecues and other appliances cooking primarily by radiated heat, excepting toasters. BTU. Abbreviation for British thermal unit, which is the quantity of heat required to raise the temperature of 1 pound (454 g) of water 1°F ( - 17.2 ° C) (1 Btu = 1055 J). BURNER. A device for the final conveyance of the gas, or a mixture of gas and air, to the combustion zone. Induced draft. A burner that depends on draft induced by a fan that is an integral part of the appliance and is located downstream from the burner. Power. A burner in which gas, air or both are supplied at pressures exceeding, for gas, the line pressure, and for air, atmospheric pressure, with t his added pressure being applied at the burner. CHIMNEY. A primarily vertical structure containing one or more flues used to remove hot gases from burning fuel, refuse, or industrial processes from a fuel - burning appliance to the outdoor atmosphere. Factor y - built chimney. A listed and labeled chimney composed of factory - made components, assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 5 Masonry chimney. A field - constructed chimney composed of solid mason ry units, bricks, stones or concrete. Metal chimney. A field - constructed chimney composed of metal. CLEARANCE. The minimum distance through air measured between the heat - producing surface of the mechanical appliance, device or equipment and the surface of the combustible material or assembly. CLOTHES DRYER. An appliance used to dry wet laundry by means of heated air. Dryer classifications are as follows: Type 1. Factory - built package, multiple production. Primarily used in family living environment. Usually the smallest unit physically and in function output. Type 2. Factory - built package, multiple production. Used in business with direct intercourse of the functi on with the public. Not designed for use in individual family living environment. COMBUSTIBLE ASSEMBLY. Wall, floor, ceiling or other assembly constructed of one or more component mate- rials that are not defined as noncombustible. COMBUSTIBLE MATERIAL. Any material not defined as noncombustible. COMBUSTION. In the context of this code, refers to the rapid oxidation of fuel accompanied by the production of heat or heat and light. COMBUSTION AIR . Air necessary for complete combustion of a fuel, including theor etical air and excess air. COMBUSTION CHAMBER. The portion of an appliance within which combustion occurs. COMBUSTION PRODUCTS. Constituents resulting from the combustion of a fuel with the oxygen of the air, including inert gases, but excluding excess air. CONCEALED LOCATION. A location that cannot be accessed without damaging permanent parts of the building structure or finished surface. Spaces above, below or behind readily removable panels or doors shall not be considered as concealed. CONCEAL ED PIPING. Piping that is located in a concealed location (see “Concealed location ”). CONDENSATE. The liquid that condenses from a gas (including flue gas) caused by a reduction in temperature or increase in pressure. CONNECTOR, APPLIANCE (Fuel). Rigid metallic pipe and fittings or a listed and labeled device that connects an appliance to the gas piping system. CONNECTOR, CHIMNEY OR VENT. The pipe that connects an appliance to a chimney or vent. CONTROL. A manual or automatic device designed to re gulate the gas, air, water or electrical supply to, or operation of, a mechanical system. CONVERSION BURNER. A unit consisting of a burner and its controls for installation in an appliance originally uti- lizing another fuel. COUNTER APPLIANCES. Appliances s uch as coffee brewers and coffee urns and any appurtenant water - heating ap- pliance, food and dish warmers, hot plates, griddles, waffle bakers and other appliances designed for installation on or in a counter. CUBIC FOOT. The amount of gas that occupies 1 c ubic foot (0.02832 m 3 ) when at a temperature of 60°F ( 15.6 ° C), saturated with water vapor and under a pressure equivalent to that of 30 inches of mercury (101 kPa). DAMPER. A manually or automatically controlled device to regulate draft or the rate of flow of air or combustion gases. DECORATIVE APPLIANCE, VENTED. A vented appliance wherein the primary function lies in the aesthetic effect of the flames. DEFINITIONS 2 - 6 2022 NEW YORK CITY FUEL GAS CODE DECORATIVE APPLIANCES FOR INSTALLATION IN VENTED FIREPLACES. A vented appliance de- signed for installa tion within the fire chamber of a vented fireplace, wherein the primary function lies in the aesthetic effect of the flames. DECORATIVE SHROUD. A listed, partial, noncombustible enclosure for aesthetic purposes that is installed at the termination of a ven ting system that surrounds or conceals a factory - built chimney system or vent cap. DEMAND. The maximum amount of gas input required per unit of time, usually expressed in cubic feet per hour (1 ft 3 = 0.0283 m 3 ), or Btu/h (1 Btu/h = 0.2931 W). DILUTION AIR. Air that is introduced into a draft hood and is mixed with the flue gases. DIRECT - VENT APPLIANCES. Appliances that are constructed and installed so that all air for combustion is derived directly from the outdo or atmosphere and all flue gases are discharged directly to the outdoor atmosphere. DRAFT. The pressure difference existing between the appliance or any component part and the atmosphere, that causes a continuous flow of air and products of combustion thro ugh the gas passages of the appliance to the atmos- phere. Induced draft. The pressure difference created by the action of a fan, blower or ejector, that is located between the appliance and the chimney or vent termination. Natural draft. The pressure difference created by a vent or chimney because of its height, and the temperature difference between the flue gases and the atmosphere. DRAFT HOOD. A nonadjustable device built into an appliance, or made as part of the vent connector from an appl iance, that is designed to (1) provide for ready escape of the flue gases from the appliance in the event of no draft, backdraft or stoppage beyond the draft hood, (2) prevent a backdraft from entering the appliance, and (3) neutralize the effect of stack action of the chimney or gas vent upon operation of the appliance. DRAFT REGULATOR. A device that functions to maintain a desired draft in the appliance by automatically reducing the draft to the desired value. DRIP. A nipple and cap placed at a low point in a system of piping to collect condensate and from which the conden- sate is removable. DRY GAS. A gas having a moisture and hydrocarbon dew point below any normal temperature to which the gas piping is exposed. DUCT FURNACE. A warm - air furnace or heater n ormally installed in an air distribution duct to supply warm air for heating. This definition shall apply only to a warm - air heating appliance that, for air circulation, depends on a blower not furnished as part of the furnace. DUCT SYSTEM. A continuous pa ssageway for the transmission of air that, in addition to ducts, includes duct fittings, dampers, plenums, fans and accessory air - handling equipment and appliances . DWELLING. A building or structure which is occupied in whole or in part as the home, residence or sleeping place of one or more families. DWELLING UNIT. A single unit consisting of one or more habitable rooms and occupied or arranged to be occupied as a unit separa te from all other units within a dwelling. EQUIPMENT. Any apparatus or device that delivers gas as a fuel or raw material to an appliance or vents combustion products from an appliance, including but not limited to control devices, pressure regulators, val ves, appliance appurtenances, gas connectors, or power exhausters used in connections to appliances. EXCESS FLOW VALVE (EFV). A safety shut - off valve designed to activate to interrupt the flow of gas when the fuel gas passing through it exceeds a prescribe d flow rate. Installed where specifically required by code or utility company. EXHAUST. Air being removed from any space, appliance or piece of equipment conveyed directly to the atmosphere by means of openings or ducts. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 7 EXTERIOR MASONRY CHIMNEYS. Masonry chimneys exposed to the outdoors on one or more sides below the roof line. FIREPLACE. An assembly consisting of a hearth and fire chamber of noncombustible material and provided with a chimney , for use with solid fuels. Factory - built fireplace. A listed and labeled fireplace and chimney system composed of factory - made compo- nents , and assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. Masonry fireplace. A hearth and fire chamber of s olid masonry units such as bricks, stones, listed masonry units or reinforced concrete, provided with a suitable chimney. FLAME SAFEGUARD. A device that will automatically shut off the fuel supply to a main burner or group of burners when the means of igni tion of such burners becomes inoperative, and when flame failure occurs on the burner or group of burners. FLASHBACK ARRESTOR CHECK VALVE. A device that will prevent the backflow of one gas into the supply system of another gas and prevent the passage of flame into the gas supply system. FLOOR FURNACE. A completely self - contained furnace suspended from the floor of the space being heated, ta king air for combustion from outside such space and with means for observing flames and lighting the appliance from such space. Fan type. A floor furnace equipped with a fan that provides the primary means for circulating air. Gravity type. A floor furnace depending primarily on circulation of air by gravity. This classification shall also include floor furnaces equipped with booster - type fans that do not materially restrict free circulation of air by gravity flow when such fans are not in operation. FLUE. A passageway within a chimney or vent through which gaseous combustion products pass. FLUE, APPLIANCE. The passage(s) within an appliance through which combustion products pass from the combustion chamber of the appliance to the draft hood inlet opening on an appliance equipped with a draft hood or to the outlet of the appliance on an appliance not equipped with a draft hood. FLUE COLLAR. That portion of an appliance designed for the attachment of a draft hood, vent connector or venting system. FL UE GASES. Products of combustion plus excess air in fireplace and appliance flues or heat exchangers. FLUE LINER (LINING). A system or material used to form the inside surface of a flue in a chimney or vent, for the purpose of protecting the surrounding st ructure from the effects of combustion products and for conveying combustion products without leakage into the atmosphere. FUEL GAS. A natural gas, manufactured gas, liquefied petroleum gas or mixtures of these gases. FURNACE. A completely self - contained h eating unit that is designed to supply heated air to spaces remote from or adjacent to the appliance location. FURNACE, CENTRAL. A self - contained appliance for heating air by transfer of heat of combustion through metal to the air, and designed to supply h eated air through ducts to spaces remote from or adjacent to the appliance location. Forced - air type. A central furnace equipped with a fan or blower that provides the primary means for circulation of air. FURNACE PLENUM. An air compartment or chamber to which one or more ducts are connected and that forms part of an air distribution system. GAS CONVENIENCE OUTLET. A permanently mounted, manually operated device that provides the means for connecting an appliance to, and d isconnecting an appliance from, the supply piping. The device includes an integral, manually operated valve with a nondisplaceable valve member and is designed so that disconnection of an appliance only occurs when the manually operated valve is in the clo sed position. DEFINITIONS 2 - 8 2022 NEW YORK CITY FUEL GAS CODE GAS PIPING. An installation of pipe, valves or fittings installed on a premises or in a building and utilized to convey fuel gas. GAS UTILIZATION EQUIPMENT. An appliance that utilizes gas as a fuel or raw material or both. HAZARDOUS LOCATION. Any location considered to be a fire hazard for flammable vapors, dust, combustible fibers or other highly combustible substances. The location is not necessarily categorized in the New York City Building Code as a high - hazard group classification. HOUSE PIPING. See “Piping system.” HYDROGEN FUEL GAS ROOM. A separately ventilated, fully enclosed room designed to exclusively house the generation of gaseous hydrogen for immediate on - premises use in indoor fuel cells or other energy production process, and incidental indoor storage of gaseous hydrogen. A hydro gen fuel gas room is not intended to house the production or dispensing of hydrogen motor fuel. IGNITION SOURCE. A flame, spark or hot surface capable of igniting flammable vapors or fumes. Such sources include appliance burners, burner ignitors, and elect rical switching devices. INCINERATOR. An appliance used to reduce combustible refuse material to ashes and that is manufactured, sold and installed as a complete unit. INDUSTRIAL AIR HEATERS, NONRECIRCULATING DIRECT - FIRED . A heater in which all the product s of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating only outdoor air. INDUSTRIAL AIR HEATERS, RECIRCULATING DIRECT - FIRED . A heater in which all the pro ducts of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating outdoor air, and, if applicable, indoor air. INFRARED RADIANT HEATER. A heater that directs a s ubstantial amount of its energy output in the form of infrared radiant energy into the area to be heated. Such heaters are of either the vented or unvented type. INTEGRAL VENT APPLIANCES. Appliances designed for outdoor installation that have built - in natu ral or me- chanical venting means and are constructed and installed so that all air for combustion is derived from the outdoor atmosphere and all flue gases are discharged to the outdoor atmosphere through an integral vent termination. INTERLOCK. A device actuated by another device with which it is directly associated, to govern succeeding oper- ations of the same or allied devices. A circuit in which a given action cannot occur until after one or more other actions have taken place. JOINT, FLANGED. A joint made by bolting together a pair of flanged ends. JOINT, FLARED. A metal - to - metal compression joint in which a conical spread is made on the end of a tube that is compressed by a flare nut against a mating flare. JOINT, MECHANICAL. A general form o f gas - tight joints obtained by the joining of metal parts through a positive - holding mechanical construction, such as press joint, flanged joint, threaded joint, flared joint or compression joint. JOINT, PLASTIC ADHESIVE. A joint made in thermoset plastic piping by the use of an adhesive substance that forms a continuous bond between the mating surfaces without dissolving either one of them. JOINT, PLASTIC HEAT FUSION. A joint made in thermoplastic piping by heating the parts sufficiently to permit fusion o f the materials when the parts are pressed together. JOINT, WELDED. A gas - tight joint obtained by the joining of metal parts in molten state. LEAK CHECK. An operation performed on a gas piping system to verify that the system does not leak. Leakage checks are intended to discover open outlets, defective appliance connection and defects that have developed since the initial installation, normally performed after pressure testing. LIMIT CONTROL. A device responsive to changes in pressure, temperature or level for turning on, shutting off or throttling the gas supply to an appliance. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 9 LIQUEFIED PETROLEUM GAS or LPG (LP - GAS). Liquefied petroleum gas composed predominately of pro- pane, propylene, buta nes or butylenes, or mixtures thereof that is gaseous under normal atmospheric conditions, but is capable of being liquefied under moderate pressure at normal temperatures. LIVING SPACE. Space within a dwelling unit utilized for living, sleeping, eating, c ooking, bathing, washing and sanitation purposes. LOG LIGHTER. A manually operated solid fuel ignition appliance for installation in a vented solid fuel - burning fireplace. MAIN BURNER. A device or group of devices essentially forming an integral unit for t he final conveyance of gas or a mixture of gas and air to the combustion zone, and in which combustion takes place to accomplish the function for which the appliance is designed. METER. The instrument installed to measure the volume of gas delivered throug h it. NPS. An abbreviation for “Nominal pipe size.” NONCOMBUSTIBLE MATERIALS. Materials that, when tested in accordance with ASTM E 136, have at least three of four specimens tested meeting all of the following criteria: 1. The recorded temperature of the surface and interior thermocouples shall not at any time during the test rise more than 54ºF (12.2ºC) above the furnace temperature at the beginning of the test. 2. There shall not be flaming from the specimen after the first 30 seconds. 3. If the weight l oss of the specimen during testing exceeds 50 percent, the recorded temperature of the surface and interior thermocouples shall not at any time during the test rise above the furnace air temperature at the beginning of the test, and there shall not be flam ing of the specimen. OFFSET (VENT). A combination of approved bends that makes two changes in direction bringing one section of the vent out of line but into a line parallel with the other section. ORIFICE. The opening in a cap, spud or other device whereb y the flow of gas is limited and through which the gas is discharged to the burner. OUTLET. The point at which a gas - fired appliance connects to the gas piping system. OXYGEN DEPLETION SAFETY SHUTOFF SYSTEM (ODS). A system designed to act to shut off the g as sup- ply to the main and pilot burners if the oxygen in the surrounding atmosphere is reduced below a predetermined level. PILOT. A small flame that is utilized to ignite the gas at the main burner or burners. PIPING. Where used in this code, “piping” refers to either pipe or tubing, or both. Pipe. A rigid conduit of iron, steel, copper, brass or plastic. Tubing. Semirigid conduit of copper, aluminum, plastic or steel. PIPING SYSTEM. All fuel piping, valves and fitting s from the outlet of the point of delivery to the outlets of the appliance shutoff valves. PLASTIC, THERMOPLASTIC. A plastic that is capable of being repeatedly softened by increase of temperature and hardened by decrease of temperature. POINT OF DELIVERY. For natural gas systems, the point of delivery is the outlet of the service meter assembly or the outlet of the service regulator or service shutoff valve where a meter is not provided. Where a valve is provided at the outlet of the service meter assembly, such valve shall be considered to be downstream of the point of delivery. PORTABLE FUEL CELL APPLIANCE. A fuel cell generator of electricity, which is not fixed in place. A portable fuel cell appliance utilizes a cord and plug connection to a gr id - isolated load and has an integral fuel supply. PRESSURE DROP. The loss in pressure due to friction or obstruction in pipes, valves, fittings, regulators and burn- ers. DEFINITIONS 2 - 10 2022 NEW YORK CITY FUEL GAS CODE PRESSURE TEST. An operation performed to verify the gas - tight integrity of gas piping f ollowing its installation or modification. PURGE. To free a gas conduit of air or gas, or a mixture of gas and air. QUICK - DISCONNECT DEVICE. A hand - operated device that provides a means for connecting and disconnecting an appliance or an appliance connecto r to a gas supply and that is equipped with an automatic means to shut off the gas supply when the device is disconnected. READY ACCESS (TO). That which enables a device, fixture, appliance or equipment to be directly reached, without requiring the removal or movement of any panel, door or similar obstruction (see “Access (to) ”). REGULATOR. A device for controlling and maintaining a uniform supply pressure, either pounds - to - inches water column (MP regulator) or inches - to - inches water column (appliance regulator). REGULATOR, GAS APPLIANCE. A pressure regulator for controlling pressure to the manifold of the appliance. Types of appliance regulators are as follows: Adjustable. 1. Spring type, limited adjustment. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, the loading of which is adjus table over a range of not more than 15 percent of the outlet pressure at the midpoint of the adjustment range. 2. Spring type, standard adjustment. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, th e loading of which is adjustable. The adjustment means shall be con- cealed. Multistage. A regulator for use with a single gas whose adjustment means is capable of being positioned manually or automatically to two or more predetermined outlet pressure settin gs. Each of these settings shall be adjustable or nonadjustable. The regulator may modulate outlet pressures automatically between its maximum and minimum predetermined outlet pressure settings. Nonadjustable. 1. Spring type, nonadjustable. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, the loading of which is not field adjustable. 2. Weight type. A regulator in which the regulating force acting upon the diaphragm is derived from a weight or combina tion of weights. REGULATOR, LINE GAS PRESSURE. A device placed in a gas line between the service pressure regulator and the appliance for controlling, maintaining or reducing the pressure in that portion of the piping system downstream of the device. REGUL ATOR, MEDIUM - PRESSURE (MP Regulator). A line pressure regulator that reduces gas pressure from the range of greater than 0.5 psig (3.4 kPa) and less than or equal to 5 psig (34.5 kPa) to a lower pressure. REGULATOR, PRESSURE. A device placed in a gas line for reducing, controlling and maintaining the pressure in that portion of the piping system downstream of the device. REGULATOR, SERVICE PRESSURE. A device installed by the serving gas supplier to reduce and limit the ser- vice line pressure to delivery pres sure. RELIEF OPENING. The opening provided in a draft hood to permit the ready escape to the atmosphere of the flue products from the draft hood in the event of no draft, back draft or stoppage beyond the draft hood, and to permit air into the draft hood i n the event of a strong chimney updraft. RELIEF VALVE (DEVICE). A safety valve designed to forestall the development of a dangerous condition by relieving either pressure, temperature or vacuum . RELIEF VALVE, PRESSURE. An automatic valve that opens and clo ses a relief vent, depending on whether the pressure is above or below a predetermined value. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 11 RELIEF VALVE, TEMPERATURE. Manual reset type. A valve that automatically opens a relief vent at a predetermined temperature and that must be manually returned to the closed position. Reseating or self - closing type. An automatic valve that opens and closes a relief vent, depending on whether the temperature is above or below a predetermined value. RELIEF VALVE, VACUUM. A valve that automatically opens and closes a v ent for relieving a vacuum within the hot water supply system, depending on whether the vacuum is above or below a predetermined value. RISER, GAS. A vertical pipe supplying fuel gas that extends one full story or more . ROOM HEATER, UNVENTED. See “Unvented room heater.” ROOM HEATER, VENTED. See “Vented room heater. ” ROUGH - IN. Parts of the gas system that are installed prior to the installation of appliances or equipment. This in- cludes gas piping, all the necessary supports and any appliances that are built into the structure. SAFETY SHUTOFF DEVICE. See “Flame safeguard.” SERVI CE PIPING. All fuel - gas piping, valves and fittings upstream of the point of delivery. SHAFT. An enclosed space extending through one or more stories of a building, connecting vertical openings in successive floors, or floors and the roof. SLEEPING UNIT. A dwelling unit, which may contain either toilet or kitchen facilities but not both. Any sleeping unit housing more than one family shall also be classified as a congregate living unit. The creation of or conversion to sleeping units shall be limited by Sec tion 27 - 2077 of the New York City Housing Maintenance Code . SPECIFIC GRAVITY. As applied to gas, specific gravity is the ratio of the weight of a given volume to that of the same volume of air, both measured under the same condition. STATIONARY FUEL CELL P OWER PLANT. A self - contained package or factory - matched packages that con- stitute an automatically operated assembly of integrated systems for generating electrical energy and recoverable ther- mal energy that is permanently connected and fixed in place. THER MOSTAT. Electric switch type. A device that senses changes in temperature and controls electrically, by means of separate components, the flow of gas to the burner(s) to maintain selected temperatures. Integral gas valve type. An automatic device, actuated by temperature changes, desi gned to control the gas supply to the burner(s) in order to maintain temperatures between predetermined limits, and in which the thermal actuating element is an integral part of the device. 1. Graduating thermostat. A thermostat in which the motion of the valve is approximately in direct proportion to the effective motion of the thermal element induced by temperature change. 2. Snap - acting thermostat. A thermostat in which the thermostatic valve travels instantly from the closed to the open position, and vi ce versa. THIRD - PARTY CERTIFICATION AGENCY. An approved agency operating a product or material certification system that incorporates initial product testing, assessment and surveillance of a manufacturer’s quality control sys- tem. THIRD - PARTY CERTIFIED. Ce rtification obtained by the manufacturer indicating that the function and perfor- mance characteristics of a product or material have been determined by testing and ongoing surveillance by an ap- proved third - party certification agency. Assertion of certificat ion is in the form of identification in accordance with the requirements of the third - party certification agency. THIRD - PARTY TESTED. Procedure by which an approved testing laboratory provides documentation that a prod- uct, material or system conforms to sp ecified requirements. DEFINITIONS 2 - 12 2022 NEW YORK CITY FUEL GAS CODE TRANSITION FITTINGS, PLASTIC TO STEEL. An adapter for joining plastic pipe to steel pipe. The purpose of this fitting is to provide a permanent, pressure - tight connection between two materials that cannot be joined directly one to ano ther. UNIT HEATER .High - static pressure type. A self - contained, automatically controlled, vented appliance having integral means for circulation of air against 0.2 inch (15 mm H 2 O) or greater static pressure. Such appliance is equipped with provisions for attaching an outlet air duct and, where the appliance is for indoor installation remote from the space to be heated, is also equipped with provisions for attaching an inlet air duct. Low - static pressure type. A self - contained, automatically controlled, ven ted appliance, intended for installation in the space to be heated without the use of ducts, having integral means for circulation of air. Such units are allowed to be equipped with louvers or face extensions made in accordance with the manufacturer’s spec ifications. UNLISTED BOILER. A boiler not listed by a nationally recognized testing agency. UNVENTED ROOM HEATER. An unvented heating appliance designed for stationary installation and utilized to provide comfort heating. Such appliance provides radiant he at or convection heat by gravity or fan circulation directly from the heater and does not utilize ducts. VALVE. A device used in piping to control the gas supply to any section of a system of piping or to an appliance. Appliance shutoff. A valve located in the piping system, used to isolate individual appliances for purposes such as service or replacement. Automatic. An automatic or semiautomatic device consisting essentially of a valve and operator that control the gas supply to the burner(s) during operat ion of an appliance. The operator shall be actuated by application of gas pressure on a flexible diaphragm, by electrical means, by mechanical means, or by other approved means. Automatic gas shutoff. A valve used in conjunction with an automatic gas shuto ff device to shut off the gas supply to a system . It shall be constructed integrally with the gas shutoff device or shall be a separate assembly. Individual main burner. A valve that controls the gas supply to an individual main burner. Main burner control. A valve that controls the gas supply to the main burner manifold. Manual main gas - control. A manually operated valve in the gas line for the purpose of completely turning on or shutting off the gas supply to the appliance, except to pilot or pilots that are provided with independent shutoff. Manual reset. An automatic shutoff valve installed in the gas supply piping and set to shut off when unsafe con- ditions occur. The device remains closed until manually reopened. Service shutoff. A valve, installed by the serving gas supplier between the service meter or source of supply and the customer pipin g system, to shut off the entire piping system. VENT. A pipe or other conduit composed of factory - made components, containing a passageway for conveying com- bustion products and air to the atmosphere, listed and labeled for use with a specific type or class of appliance. Special gas vent. A vent listed and labeled for use with listed Category II, III and IV appliances. Type B vent. A vent listed and labeled for use with appliances with draft hoods and other Category I appliances that are listed for use with Type B vents. Type BW vent. A vent listed and labeled for use with wall furnaces. Type L vent. A vent listed and labeled for use with appliances that are listed for use with Type L or Type B vents. VENT CONNECTOR. See “Connector. ” VENT GASES. Products of c ombustion from appliances plus excess air plus dilution air in the vent connector, gas vent or chimney above the draft hood or draft regulator. VENT PIPING. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 13 Breather. Piping run from a pressure - regulating device to the outdoors, designed to provide a refer ence to atmos- pheric pressure. If the device incorporates an integral pressure relief mechanism, a breather vent can also serve as a relief vent. Relief. Piping run from a pressure - regulating or pressure - limiting device to the outdoors, designed to provide for the safe venting of gas in the event of excessive pressure in the gas piping system. VENTED APPLIANCE CATEGORIES. Appliances that are categorized for the purpose of vent selection are clas- sified into the following four categories: Category I. An applia nce that operates with a nonpositive vent static pressure and with a vent gas temperature that avoids excessive condensate production in the vent. Category II. An appliance that operates with a nonpositive vent static pressure and with a vent gas temperature that is capable of causing excessive condensate production in the vent. Category III. An appliance that operates with a positive vent static pressure and wi th a vent gas temperature that avoids excessive condensate production in the vent. Category IV. An appliance that operates with a positive vent static pressure and with a vent gas temperature that is capable of causing excessive condensate production in th e vent. VENTED ROOM HEATER. A vented self - contained, free - standing , nonrecessed appliance for furnishing warm air to the space in which it is installed, directly from the heater without duct connections. VENTED WALL FURNACE. A self - contained vented applian ce complete with grilles or equivalent, designed for incorporation in or permanent attachment to the structure of a building, mobile home or travel trailer, and furnishing heated air circulated by gravity or by a fan directly into the space to be heated th rough openings in the casing. This definition shall exclude floor furnaces, unit heaters and central furnaces as herein defined. VENTING SYSTEM. A continuous open passageway from the flue collar or draft hood of an appliance to the outdoor atmosphere for t he purpose of removing flue or vent gases. A venting system is usually composed of a vent or a chimney and vent connector, if used, assembled to form the open passageway. Forced - draft venting system. A portion of a venting system using a fan or other mecha nical means to cause the removal of flue or vent gases under positive static vent pressure. Induced draft venting system. A portion of a venting system using a fan or other mechanical means to cause the removal of flue or vent gases under nonpositive stati c vent pressure. Mechanical draft venting system. A venting system designed to remove flue or vent gases by mechanical means, that consists of an induced draft portion under nonpositive static pressure or a forced draft portion under positive static pressu re. Natural draft venting system. A venting system designed to remove flue or vent gases under nonpositive static vent pressure entirely by natural draft. WALL HEATER, UNVENTED - TYPE. A room heater of the type designed for insertion in or attachment to a wa ll or partition. Such heater does not incorporate concealed venting arrangements in its construction and discharges all products of combustion through the front into the room being heated. WATER HEATER. Any heating appliance or equipment that heats potable water and supplies such water to the potable hot water distribution system. 2022 NEW YORK CITY FUEL GAS CODE 2 - 1 ‡‡‡ Chapter 2 was amended by Local Law 77 of 2023 . This law has an effective date of June 10, 2023. CHAPTER 2 DEFINITIONS SECTION FGC 201 GENERAL 201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code and standard, have the meanings indicated in this chapter. 201.2 Inter changeability. Words used in the present tense include the future; words in the masculine gender in- clude the feminine and neuter; the singular number includes the plural and the plural, the singular. 201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the New York City Electrical Code , New York City Building Code , New York City Fire Code , New York City Mechanical Code , New York City Plumbing Code , or the New York City Energy Conservation Code , such terms shall have meanings ascribed to them as in those codes. ‡‡‡ 201.3.1 Terms defined in the general administrative provisions. The following terms are defined in Sec- tion 28 - 101.5 of the Administrative Code : 1968 BUILDING CODE. 1968 OR PRIOR CODE BUILDINGS OR STRUCTURES (PRIOR CODE BUILDINGS). ACCEPTANCE OR ACCEPTED. ADDITION. ADMINISTRATIVE CODE. ALTERATION. APPROVAL OR APPROVED. APPROVED AGENCY. APPROVED FABRICATOR. APPROVED INSPECTION AGENCY. APPROVED TESTING AGENCY. ARCHITECT. BUILDING. CERTIFICATE OF COMPLIANCE. CHARTER. CITY. COMMISSIONER. CONSTRUCTION DOCUMENTS. DAY. DEFERRED SUBMITTAL. DEMOLITION. DEMOLITION, FULL. DEFINITIONS 2 - 2 2022 NEW YORK CITY FUEL GAS CODE DEMOLITION, PARTIAL. DEPARTMENT. ENGINEER. ENLARGEMENT. ENVIRONMENTAL CONTROL BOARD or ECB. EXISTING BUILDING OR STRUCTUR E. FABRICATED ITEM. FIRE PROTECTION PLAN. HEREAFTER. HERETOFORE. INSPECTION CERTIFICATE. INTERIM CERTIFICATE OF OCCUPANCY. LABEL. LABELED. LAND SURVEYOR. LANDSCAPE ARCHITECT. LETTER OF COMPLETION. LIMITED ALTERATION APPLICATION. LIMITED PLUMBING ALTERATIONS. LIMITED SPRINKLER ALTERATIONS. LIMITED STANDPIPE ALTERATIONS. LISTED. MAIN USE OR DOMINANT OCCUPANCY (OF A BUILDING). MANUFACTURER’S DESIGNATION. MARK. MATERIALS. OCCUPANCY. OWNER. PARTY WALL. PERMIT. PERSON. PREMISES. PRIOR CODE BUILDING. PROFESSIONAL CERTIFICATION. PROGRESS INSPECTION. PROJECT. REGISTERED DESIGN PROFESSIONAL. REGISTERED DESIGN PROFESSIONAL OF RECORD. REQUIRED. RETAINING WALL. SERVICE EQUIPMENT. SIGN - OFF. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 3 SINGLE ROOM OCCUPANCY MULTIPLE DWELLING. SPECIAL INSPECTION . SPECIAL INSPECTION AGENCY. SPECIAL INSPECTOR. STRUCTURE. SUBMITTAL DOCUMENTS. SUPERINTENDENT OF CONSTRUCTION (CONSTRUCTION SUPERINTENDENT). USE (USED). UTILITY COMPANY OR PUBLIC UTILITY COMPANY. UTILITY CORPORATION OR PUBLIC UTILITY CORPORATION. WORK NOT CONSTITUTING MINOR ALTERATIONS OR ORDINARY REPAIRS. WRITING (WRITTEN). WRITTEN NOTICE. ZONING RESOLUTION. 201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have ordin arily accepted meanings such as the context implies. ‡‡‡ SECTION FGC 202 GENERAL DEFINITIONS ABNORMAL OPERATING CONDITION. A condition that may indicate a malfunction or a noncompliant com- ponent of a piping system or appliance. ACCESS (TO). That which enables a device, fixture, appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel, door or similar obstruction (see also “Ready access (to) ”). AIR CONDITIONER, GAS - FIRED. A gas - b urning, automatically operated appliance for supplying cooled or dehumidified air or chilled liquid. AIR CONDITIONING. The treatment of air so as to control simultaneously the temperature, humidity, cleanness and distribution of the air to meet the require ments of a conditioned space. AIR, EXHAUST. See “Exhaust.” AIR - HANDLING UNIT. A blower or fan used for the purpose of distributing supply air to a room, space or area. AIR, MAKEUP. Any combination of outdoor and transfer air intended to replace exhaust air and exfiltration. APPLIANCE. Any apparatus or device that utilizes a fuel or raw material to produce light, heat, power, refrigeration or air conditioning. APPLIANCE, AUTOMATICALLY CONTROLLED. Appliances equipped with an automatic b urner ignition and safety shutoff device and other automatic devices which accomplish complete turn - on and shutoff of the gas to the main burner or burners, and graduate the gas supply to the burner or burners, but do not affect complete shutoff of the gas . APPLIANCE TYPE. Low - heat appliance (residential appliance). Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of 1,000 ° F (538 ° C) or less. Medium - heat appliance. Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of more than 1,000 ° F (538 ° C ) or less but not greater than 2,000 ° F ( 1093 .3° C). DEFINITIONS 2 - 4 2022 NEW YORK CITY FUEL GAS CODE APPLIANCE, UNVENTED. An appliance designed or installed in such a manner that the products of combustion are not conveyed by a vent or chimney directly to the outdoor atmosphere. APPLIANCE, VENTED. An appliance designed and installed in such a manner that all of the products o f com- bustion are conveyed directly from the appliance to the outdoor atmosphere through an approved chimney or vent system. See also “VENTED APPLIANCE CATEGORIES.” ATMOSPHERIC PRESSURE. The pressure of the weight of air and water vapor on the surface of th e earth, ap- proximately 14.7 pounds per square inch (psi) (101 kPa absolute) at sea level. BAFFLE. An object placed in an appliance to change the direction of or retard the flow of air, air - gas mixtures or flue gases. BAROMETRIC DRAFT REGULATOR. A balanced damper device attached to a chimney, vent connector, breeching or flue gas manifold to protect combustion appliances by controlling chimney draft. A double - acting barometric draft regulator is one in which the balancing damper is free to move in either direction to protect combustion appliances from both excessive draft and backdraft. BOILER, HIGH - PRESSURE. An appliance for supplying steam or hot water that, for a steam boiler, operates at a pressure of more than 15 psig ( 103.4 kPa gauge), and for a hot water boiler, operates at a pressure exceeding 160 psig ( 1103 kPa gauge) or at a temperature exceeding 250° F ( 121.1 °C). BOILER, LOW - PRESSURE. A self - contained appliance for supplying steam or hot water as follows: Hot water heating boiler. A boiler in which no steam is generated, from which hot water is circulated for heating purposes and then returned to the boiler, and that operates at water pressures not exceeding 160 pounds per square inch gauge (psig) ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Hot water supply boiler. A boiler, completely fill ed with water, which furnishes hot water to be used externally to itself, and that operates at water pressures not exceeding 160 psig ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Steam heating boile r. A boiler in which steam is generated and that operates at a steam pressure not exceeding 15 psig ( 103.4 kPa gauge). BRANCH. A section of gas piping downstream from a riser, leading to appliances or equipment on no more than two consecutive floors. BRAZING. A metal - joining process wherein coalescence is produced by the use of a nonferrous filler metal having a melting point above 1,000°F ( 537.8 ° C), but lower than that of the base metal being joined. The filler material is distributed between the clos ely fitted surfaces of the joint by capillary action. BROILER. A general term including salamanders, barbecues and other appliances cooking primarily by radiated heat, excepting toasters. BTU. Abbreviation for British thermal unit, which is the quantity of heat required to raise the temperature of 1 pound (454 g) of water 1°F ( - 17.2 ° C) (1 Btu = 1055 J). BURNER. A device for the final conveyance of the gas, or a mixture of gas and air, to the combustion zone. Induced draft. A burner that depends on draft induced by a fan that is an integral part of the appliance and is located downstream from the burner. Power. A burner in which gas, air or both are supplied at pressures exceeding, for gas, the line pressure, and for air, atmospheric pressure, with t his added pressure being applied at the burner. CHIMNEY. A primarily vertical structure containing one or more flues used to remove hot gases from burning fuel, refuse, or industrial processes from a fuel - burning appliance to the outdoor atmosphere. Factor y - built chimney. A listed and labeled chimney composed of factory - made components, assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 5 Masonry chimney. A field - constructed chimney composed of solid mason ry units, bricks, stones or concrete. Metal chimney. A field - constructed chimney composed of metal. CLEARANCE. The minimum distance through air measured between the heat - producing surface of the mechanical appliance, device or equipment and the surface of the combustible material or assembly. CLOTHES DRYER. An appliance used to dry wet laundry by means of heated air. Dryer classifications are as follows: Type 1. Factory - built package, multiple production. Primarily used in family living environment. Usually the smallest unit physically and in function output. Type 2. Factory - built package, multiple production. Used in business with direct intercourse of the functi on with the public. Not designed for use in individual family living environment. COMBUSTIBLE ASSEMBLY. Wall, floor, ceiling or other assembly constructed of one or more component mate- rials that are not defined as noncombustible. COMBUSTIBLE MATERIAL. Any material not defined as noncombustible. COMBUSTION. In the context of this code, refers to the rapid oxidation of fuel accompanied by the production of heat or heat and light. COMBUSTION AIR . Air necessary for complete combustion of a fuel, including theor etical air and excess air. COMBUSTION CHAMBER. The portion of an appliance within which combustion occurs. COMBUSTION PRODUCTS. Constituents resulting from the combustion of a fuel with the oxygen of the air, including inert gases, but excluding excess air. CONCEALED LOCATION. A location that cannot be accessed without damaging permanent parts of the building structure or finished surface. Spaces above, below or behind readily removable panels or doors shall not be considered as concealed. CONCEAL ED PIPING. Piping that is located in a concealed location (see “Concealed location ”). CONDENSATE. The liquid that condenses from a gas (including flue gas) caused by a reduction in temperature or increase in pressure. CONNECTOR, APPLIANCE (Fuel). Rigid metallic pipe and fittings or a listed and labeled device that connects an appliance to the gas piping system. CONNECTOR, CHIMNEY OR VENT. The pipe that connects an appliance to a chimney or vent. CONTROL. A manual or automatic device designed to re gulate the gas, air, water or electrical supply to, or operation of, a mechanical system. CONVERSION BURNER. A unit consisting of a burner and its controls for installation in an appliance originally uti- lizing another fuel. COUNTER APPLIANCES. Appliances s uch as coffee brewers and coffee urns and any appurtenant water - heating ap- pliance, food and dish warmers, hot plates, griddles, waffle bakers and other appliances designed for installation on or in a counter. CUBIC FOOT. The amount of gas that occupies 1 c ubic foot (0.02832 m 3 ) when at a temperature of 60°F ( 15.6 ° C), saturated with water vapor and under a pressure equivalent to that of 30 inches of mercury (101 kPa). DAMPER. A manually or automatically controlled device to regulate draft or the rate of flow of air or combustion gases. DECORATIVE APPLIANCE, VENTED. A vented appliance wherein the primary function lies in the aesthetic effect of the flames. DEFINITIONS 2 - 6 2022 NEW YORK CITY FUEL GAS CODE DECORATIVE APPLIANCES FOR INSTALLATION IN VENTED FIREPLACES. A vented appliance de- signed for installa tion within the fire chamber of a vented fireplace, wherein the primary function lies in the aesthetic effect of the flames. DECORATIVE SHROUD. A listed, partial, noncombustible enclosure for aesthetic purposes that is installed at the termination of a ven ting system that surrounds or conceals a factory - built chimney system or vent cap. DEMAND. The maximum amount of gas input required per unit of time, usually expressed in cubic feet per hour (1 ft 3 = 0.0283 m 3 ), or Btu/h (1 Btu/h = 0.2931 W). DILUTION AIR. Air that is introduced into a draft hood and is mixed with the flue gases. DIRECT - VENT APPLIANCES. Appliances that are constructed and installed so that all air for combustion is derived directly from the outdo or atmosphere and all flue gases are discharged directly to the outdoor atmosphere. DRAFT. The pressure difference existing between the appliance or any component part and the atmosphere, that causes a continuous flow of air and products of combustion thro ugh the gas passages of the appliance to the atmos- phere. Induced draft. The pressure difference created by the action of a fan, blower or ejector, that is located between the appliance and the chimney or vent termination. Natural draft. The pressure difference created by a vent or chimney because of its height, and the temperature difference between the flue gases and the atmosphere. DRAFT HOOD. A nonadjustable device built into an appliance, or made as part of the vent connector from an appl iance, that is designed to (1) provide for ready escape of the flue gases from the appliance in the event of no draft, backdraft or stoppage beyond the draft hood, (2) prevent a backdraft from entering the appliance, and (3) neutralize the effect of stack action of the chimney or gas vent upon operation of the appliance. DRAFT REGULATOR. A device that functions to maintain a desired draft in the appliance by automatically reducing the draft to the desired value. DRIP. A nipple and cap placed at a low point in a system of piping to collect condensate and from which the conden- sate is removable. DRY GAS. A gas having a moisture and hydrocarbon dew point below any normal temperature to which the gas piping is exposed. DUCT FURNACE. A warm - air furnace or heater n ormally installed in an air distribution duct to supply warm air for heating. This definition shall apply only to a warm - air heating appliance that, for air circulation, depends on a blower not furnished as part of the furnace. DUCT SYSTEM. A continuous pa ssageway for the transmission of air that, in addition to ducts, includes duct fittings, dampers, plenums, fans and accessory air - handling equipment and appliances . DWELLING. A building or structure which is occupied in whole or in part as the home, residence or sleeping place of one or more families. DWELLING UNIT. A single unit consisting of one or more habitable rooms and occupied or arranged to be occupied as a unit separa te from all other units within a dwelling. EQUIPMENT. Any apparatus or device that delivers gas as a fuel or raw material to an appliance or vents combustion products from an appliance, including but not limited to control devices, pressure regulators, val ves, appliance appurtenances, gas connectors, or power exhausters used in connections to appliances. EXCESS FLOW VALVE (EFV). A safety shut - off valve designed to activate to interrupt the flow of gas when the fuel gas passing through it exceeds a prescribe d flow rate. Installed where specifically required by code or utility company. EXHAUST. Air being removed from any space, appliance or piece of equipment conveyed directly to the atmosphere by means of openings or ducts. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 7 EXTERIOR MASONRY CHIMNEYS. Masonry chimneys exposed to the outdoors on one or more sides below the roof line. FIREPLACE. An assembly consisting of a hearth and fire chamber of noncombustible material and provided with a chimney , for use with solid fuels. Factory - built fireplace. A listed and labeled fireplace and chimney system composed of factory - made compo- nents , and assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. Masonry fireplace. A hearth and fire chamber of s olid masonry units such as bricks, stones, listed masonry units or reinforced concrete, provided with a suitable chimney. FLAME SAFEGUARD. A device that will automatically shut off the fuel supply to a main burner or group of burners when the means of igni tion of such burners becomes inoperative, and when flame failure occurs on the burner or group of burners. FLASHBACK ARRESTOR CHECK VALVE. A device that will prevent the backflow of one gas into the supply system of another gas and prevent the passage of flame into the gas supply system. FLOOR FURNACE. A completely self - contained furnace suspended from the floor of the space being heated, ta king air for combustion from outside such space and with means for observing flames and lighting the appliance from such space. Fan type. A floor furnace equipped with a fan that provides the primary means for circulating air. Gravity type. A floor furnace depending primarily on circulation of air by gravity. This classification shall also include floor furnaces equipped with booster - type fans that do not materially restrict free circulation of air by gravity flow when such fans are not in operation. FLUE. A passageway within a chimney or vent through which gaseous combustion products pass. FLUE, APPLIANCE. The passage(s) within an appliance through which combustion products pass from the combustion chamber of the appliance to the draft hood inlet opening on an appliance equipped with a draft hood or to the outlet of the appliance on an appliance not equipped with a draft hood. FLUE COLLAR. That portion of an appliance designed for the attachment of a draft hood, vent connector or venting system. FL UE GASES. Products of combustion plus excess air in fireplace and appliance flues or heat exchangers. FLUE LINER (LINING). A system or material used to form the inside surface of a flue in a chimney or vent, for the purpose of protecting the surrounding st ructure from the effects of combustion products and for conveying combustion products without leakage into the atmosphere. FUEL GAS. A natural gas, manufactured gas, liquefied petroleum gas or mixtures of these gases. FURNACE. A completely self - contained h eating unit that is designed to supply heated air to spaces remote from or adjacent to the appliance location. FURNACE, CENTRAL. A self - contained appliance for heating air by transfer of heat of combustion through metal to the air, and designed to supply h eated air through ducts to spaces remote from or adjacent to the appliance location. Forced - air type. A central furnace equipped with a fan or blower that provides the primary means for circulation of air. FURNACE PLENUM. An air compartment or chamber to which one or more ducts are connected and that forms part of an air distribution system. GAS CONVENIENCE OUTLET. A permanently mounted, manually operated device that provides the means for connecting an appliance to, and d isconnecting an appliance from, the supply piping. The device includes an integral, manually operated valve with a nondisplaceable valve member and is designed so that disconnection of an appliance only occurs when the manually operated valve is in the clo sed position. DEFINITIONS 2 - 8 2022 NEW YORK CITY FUEL GAS CODE GAS PIPING. An installation of pipe, valves or fittings installed on a premises or in a building and utilized to convey fuel gas. GAS UTILIZATION EQUIPMENT. An appliance that utilizes gas as a fuel or raw material or both. HAZARDOUS LOCATION. Any location considered to be a fire hazard for flammable vapors, dust, combustible fibers or other highly combustible substances. The location is not necessarily categorized in the New York City Building Code as a high - hazard group classification. HOUSE PIPING. See “Piping system.” HYDROGEN FUEL GAS ROOM. A separately ventilated, fully enclosed room designed to exclusively house the generation of gaseous hydrogen for immediate on - premises use in indoor fuel cells or other energy production process, and incidental indoor storage of gaseous hydrogen. A hydro gen fuel gas room is not intended to house the production or dispensing of hydrogen motor fuel. IGNITION SOURCE. A flame, spark or hot surface capable of igniting flammable vapors or fumes. Such sources include appliance burners, burner ignitors, and elect rical switching devices. INCINERATOR. An appliance used to reduce combustible refuse material to ashes and that is manufactured, sold and installed as a complete unit. INDUSTRIAL AIR HEATERS, NONRECIRCULATING DIRECT - FIRED . A heater in which all the product s of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating only outdoor air. INDUSTRIAL AIR HEATERS, RECIRCULATING DIRECT - FIRED . A heater in which all the pro ducts of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating outdoor air, and, if applicable, indoor air. INFRARED RADIANT HEATER. A heater that directs a s ubstantial amount of its energy output in the form of infrared radiant energy into the area to be heated. Such heaters are of either the vented or unvented type. INTEGRAL VENT APPLIANCES. Appliances designed for outdoor installation that have built - in natu ral or me- chanical venting means and are constructed and installed so that all air for combustion is derived from the outdoor atmosphere and all flue gases are discharged to the outdoor atmosphere through an integral vent termination. INTERLOCK. A device actuated by another device with which it is directly associated, to govern succeeding oper- ations of the same or allied devices. A circuit in which a given action cannot occur until after one or more other actions have taken place. JOINT, FLANGED. A joint made by bolting together a pair of flanged ends. JOINT, FLARED. A metal - to - metal compression joint in which a conical spread is made on the end of a tube that is compressed by a flare nut against a mating flare. JOINT, MECHANICAL. A general form o f gas - tight joints obtained by the joining of metal parts through a positive - holding mechanical construction, such as press joint, flanged joint, threaded joint, flared joint or compression joint. JOINT, PLASTIC ADHESIVE. A joint made in thermoset plastic piping by the use of an adhesive substance that forms a continuous bond between the mating surfaces without dissolving either one of them. JOINT, PLASTIC HEAT FUSION. A joint made in thermoplastic piping by heating the parts sufficiently to permit fusion o f the materials when the parts are pressed together. JOINT, WELDED. A gas - tight joint obtained by the joining of metal parts in molten state. LEAK CHECK. An operation performed on a gas piping system to verify that the system does not leak. Leakage checks are intended to discover open outlets, defective appliance connection and defects that have developed since the initial installation, normally performed after pressure testing. LIMIT CONTROL. A device responsive to changes in pressure, temperature or level for turning on, shutting off or throttling the gas supply to an appliance. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 9 LIQUEFIED PETROLEUM GAS or LPG (LP - GAS). Liquefied petroleum gas composed predominately of pro- pane, propylene, buta nes or butylenes, or mixtures thereof that is gaseous under normal atmospheric conditions, but is capable of being liquefied under moderate pressure at normal temperatures. LIVING SPACE. Space within a dwelling unit utilized for living, sleeping, eating, c ooking, bathing, washing and sanitation purposes. LOG LIGHTER. A manually operated solid fuel ignition appliance for installation in a vented solid fuel - burning fireplace. MAIN BURNER. A device or group of devices essentially forming an integral unit for t he final conveyance of gas or a mixture of gas and air to the combustion zone, and in which combustion takes place to accomplish the function for which the appliance is designed. METER. The instrument installed to measure the volume of gas delivered throug h it. NPS. An abbreviation for “Nominal pipe size.” NONCOMBUSTIBLE MATERIALS. Materials that, when tested in accordance with ASTM E 136, have at least three of four specimens tested meeting all of the following criteria: 1. The recorded temperature of the surface and interior thermocouples shall not at any time during the test rise more than 54ºF (12.2ºC) above the furnace temperature at the beginning of the test. 2. There shall not be flaming from the specimen after the first 30 seconds. 3. If the weight l oss of the specimen during testing exceeds 50 percent, the recorded temperature of the surface and interior thermocouples shall not at any time during the test rise above the furnace air temperature at the beginning of the test, and there shall not be flam ing of the specimen. OFFSET (VENT). A combination of approved bends that makes two changes in direction bringing one section of the vent out of line but into a line parallel with the other section. ORIFICE. The opening in a cap, spud or other device whereb y the flow of gas is limited and through which the gas is discharged to the burner. OUTLET. The point at which a gas - fired appliance connects to the gas piping system. OXYGEN DEPLETION SAFETY SHUTOFF SYSTEM (ODS). A system designed to act to shut off the g as sup- ply to the main and pilot burners if the oxygen in the surrounding atmosphere is reduced below a predetermined level. PILOT. A small flame that is utilized to ignite the gas at the main burner or burners. PIPING. Where used in this code, “piping” refers to either pipe or tubing, or both. Pipe. A rigid conduit of iron, steel, copper, brass or plastic. Tubing. Semirigid conduit of copper, aluminum, plastic or steel. PIPING SYSTEM. All fuel piping, valves and fitting s from the outlet of the point of delivery to the outlets of the appliance shutoff valves. PLASTIC, THERMOPLASTIC. A plastic that is capable of being repeatedly softened by increase of temperature and hardened by decrease of temperature. POINT OF DELIVERY. For natural gas systems, the point of delivery is the outlet of the service meter assembly or the outlet of the service regulator or service shutoff valve where a meter is not provided. Where a valve is provided at the outlet of the service meter assembly, such valve shall be considered to be downstream of the point of delivery. PORTABLE FUEL CELL APPLIANCE. A fuel cell generator of electricity, which is not fixed in place. A portable fuel cell appliance utilizes a cord and plug connection to a gr id - isolated load and has an integral fuel supply. PRESSURE DROP. The loss in pressure due to friction or obstruction in pipes, valves, fittings, regulators and burn- ers. DEFINITIONS 2 - 10 2022 NEW YORK CITY FUEL GAS CODE PRESSURE TEST. An operation performed to verify the gas - tight integrity of gas piping f ollowing its installation or modification. PURGE. To free a gas conduit of air or gas, or a mixture of gas and air. QUICK - DISCONNECT DEVICE. A hand - operated device that provides a means for connecting and disconnecting an appliance or an appliance connecto r to a gas supply and that is equipped with an automatic means to shut off the gas supply when the device is disconnected. READY ACCESS (TO). That which enables a device, fixture, appliance or equipment to be directly reached, without requiring the removal or movement of any panel, door or similar obstruction (see “Access (to) ”). REGULATOR. A device for controlling and maintaining a uniform supply pressure, either pounds - to - inches water column (MP regulator) or inches - to - inches water column (appliance regulator). REGULATOR, GAS APPLIANCE. A pressure regulator for controlling pressure to the manifold of the appliance. Types of appliance regulators are as follows: Adjustable. 1. Spring type, limited adjustment. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, the loading of which is adjus table over a range of not more than 15 percent of the outlet pressure at the midpoint of the adjustment range. 2. Spring type, standard adjustment. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, th e loading of which is adjustable. The adjustment means shall be con- cealed. Multistage. A regulator for use with a single gas whose adjustment means is capable of being positioned manually or automatically to two or more predetermined outlet pressure settin gs. Each of these settings shall be adjustable or nonadjustable. The regulator may modulate outlet pressures automatically between its maximum and minimum predetermined outlet pressure settings. Nonadjustable. 1. Spring type, nonadjustable. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, the loading of which is not field adjustable. 2. Weight type. A regulator in which the regulating force acting upon the diaphragm is derived from a weight or combina tion of weights. REGULATOR, LINE GAS PRESSURE. A device placed in a gas line between the service pressure regulator and the appliance for controlling, maintaining or reducing the pressure in that portion of the piping system downstream of the device. REGUL ATOR, MEDIUM - PRESSURE (MP Regulator). A line pressure regulator that reduces gas pressure from the range of greater than 0.5 psig (3.4 kPa) and less than or equal to 5 psig (34.5 kPa) to a lower pressure. REGULATOR, PRESSURE. A device placed in a gas line for reducing, controlling and maintaining the pressure in that portion of the piping system downstream of the device. REGULATOR, SERVICE PRESSURE. A device installed by the serving gas supplier to reduce and limit the ser- vice line pressure to delivery pres sure. RELIEF OPENING. The opening provided in a draft hood to permit the ready escape to the atmosphere of the flue products from the draft hood in the event of no draft, back draft or stoppage beyond the draft hood, and to permit air into the draft hood i n the event of a strong chimney updraft. RELIEF VALVE (DEVICE). A safety valve designed to forestall the development of a dangerous condition by relieving either pressure, temperature or vacuum . RELIEF VALVE, PRESSURE. An automatic valve that opens and clo ses a relief vent, depending on whether the pressure is above or below a predetermined value. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 11 RELIEF VALVE, TEMPERATURE. Manual reset type. A valve that automatically opens a relief vent at a predetermined temperature and that must be manually returned to the closed position. Reseating or self - closing type. An automatic valve that opens and closes a relief vent, depending on whether the temperature is above or below a predetermined value. RELIEF VALVE, VACUUM. A valve that automatically opens and closes a v ent for relieving a vacuum within the hot water supply system, depending on whether the vacuum is above or below a predetermined value. RISER, GAS. A vertical pipe supplying fuel gas that extends one full story or more . ROOM HEATER, UNVENTED. See “Unvented room heater.” ROOM HEATER, VENTED. See “Vented room heater. ” ROUGH - IN. Parts of the gas system that are installed prior to the installation of appliances or equipment. This in- cludes gas piping, all the necessary supports and any appliances that are built into the structure. SAFETY SHUTOFF DEVICE. See “Flame safeguard.” SERVI CE PIPING. All fuel - gas piping, valves and fittings upstream of the point of delivery. SHAFT. An enclosed space extending through one or more stories of a building, connecting vertical openings in successive floors, or floors and the roof. SLEEPING UNIT. A dwelling unit, which may contain either toilet or kitchen facilities but not both. Any sleeping unit housing more than one family shall also be classified as a congregate living unit. The creation of or conversion to sleeping units shall be limited by Sec tion 27 - 2077 of the New York City Housing Maintenance Code . SPECIFIC GRAVITY. As applied to gas, specific gravity is the ratio of the weight of a given volume to that of the same volume of air, both measured under the same condition. STATIONARY FUEL CELL P OWER PLANT. A self - contained package or factory - matched packages that con- stitute an automatically operated assembly of integrated systems for generating electrical energy and recoverable ther- mal energy that is permanently connected and fixed in place. THER MOSTAT. Electric switch type. A device that senses changes in temperature and controls electrically, by means of separate components, the flow of gas to the burner(s) to maintain selected temperatures. Integral gas valve type. An automatic device, actuated by temperature changes, desi gned to control the gas supply to the burner(s) in order to maintain temperatures between predetermined limits, and in which the thermal actuating element is an integral part of the device. 1. Graduating thermostat. A thermostat in which the motion of the valve is approximately in direct proportion to the effective motion of the thermal element induced by temperature change. 2. Snap - acting thermostat. A thermostat in which the thermostatic valve travels instantly from the closed to the open position, and vi ce versa. THIRD - PARTY CERTIFICATION AGENCY. An approved agency operating a product or material certification system that incorporates initial product testing, assessment and surveillance of a manufacturer’s quality control sys- tem. THIRD - PARTY CERTIFIED. Ce rtification obtained by the manufacturer indicating that the function and perfor- mance characteristics of a product or material have been determined by testing and ongoing surveillance by an ap- proved third - party certification agency. Assertion of certificat ion is in the form of identification in accordance with the requirements of the third - party certification agency. THIRD - PARTY TESTED. Procedure by which an approved testing laboratory provides documentation that a prod- uct, material or system conforms to sp ecified requirements. DEFINITIONS 2 - 12 2022 NEW YORK CITY FUEL GAS CODE TRANSITION FITTINGS, PLASTIC TO STEEL. An adapter for joining plastic pipe to steel pipe. The purpose of this fitting is to provide a permanent, pressure - tight connection between two materials that cannot be joined directly one to ano ther. UNIT HEATER .High - static pressure type. A self - contained, automatically controlled, vented appliance having integral means for circulation of air against 0.2 inch (15 mm H 2 O) or greater static pressure. Such appliance is equipped with provisions for attaching an outlet air duct and, where the appliance is for indoor installation remote from the space to be heated, is also equipped with provisions for attaching an inlet air duct. Low - static pressure type. A self - contained, automatically controlled, ven ted appliance, intended for installation in the space to be heated without the use of ducts, having integral means for circulation of air. Such units are allowed to be equipped with louvers or face extensions made in accordance with the manufacturer’s spec ifications. UNLISTED BOILER. A boiler not listed by a nationally recognized testing agency. UNVENTED ROOM HEATER. An unvented heating appliance designed for stationary installation and utilized to provide comfort heating. Such appliance provides radiant he at or convection heat by gravity or fan circulation directly from the heater and does not utilize ducts. VALVE. A device used in piping to control the gas supply to any section of a system of piping or to an appliance. Appliance shutoff. A valve located in the piping system, used to isolate individual appliances for purposes such as service or replacement. Automatic. An automatic or semiautomatic device consisting essentially of a valve and operator that control the gas supply to the burner(s) during operat ion of an appliance. The operator shall be actuated by application of gas pressure on a flexible diaphragm, by electrical means, by mechanical means, or by other approved means. Automatic gas shutoff. A valve used in conjunction with an automatic gas shuto ff device to shut off the gas supply to a system . It shall be constructed integrally with the gas shutoff device or shall be a separate assembly. Individual main burner. A valve that controls the gas supply to an individual main burner. Main burner control. A valve that controls the gas supply to the main burner manifold. Manual main gas - control. A manually operated valve in the gas line for the purpose of completely turning on or shutting off the gas supply to the appliance, except to pilot or pilots that are provided with independent shutoff. Manual reset. An automatic shutoff valve installed in the gas supply piping and set to shut off when unsafe con- ditions occur. The device remains closed until manually reopened. Service shutoff. A valve, installed by the serving gas supplier between the service meter or source of supply and the customer pipin g system, to shut off the entire piping system. VENT. A pipe or other conduit composed of factory - made components, containing a passageway for conveying com- bustion products and air to the atmosphere, listed and labeled for use with a specific type or class of appliance. Special gas vent. A vent listed and labeled for use with listed Category II, III and IV appliances. Type B vent. A vent listed and labeled for use with appliances with draft hoods and other Category I appliances that are listed for use with Type B vents. Type BW vent. A vent listed and labeled for use with wall furnaces. Type L vent. A vent listed and labeled for use with appliances that are listed for use with Type L or Type B vents. VENT CONNECTOR. See “Connector. ” VENT GASES. Products of c ombustion from appliances plus excess air plus dilution air in the vent connector, gas vent or chimney above the draft hood or draft regulator. VENT PIPING. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 13 Breather. Piping run from a pressure - regulating device to the outdoors, designed to provide a refer ence to atmos- pheric pressure. If the device incorporates an integral pressure relief mechanism, a breather vent can also serve as a relief vent. Relief. Piping run from a pressure - regulating or pressure - limiting device to the outdoors, designed to provide for the safe venting of gas in the event of excessive pressure in the gas piping system. VENTED APPLIANCE CATEGORIES. Appliances that are categorized for the purpose of vent selection are clas- sified into the following four categories: Category I. An applia nce that operates with a nonpositive vent static pressure and with a vent gas temperature that avoids excessive condensate production in the vent. Category II. An appliance that operates with a nonpositive vent static pressure and with a vent gas temperature that is capable of causing excessive condensate production in the vent. Category III. An appliance that operates with a positive vent static pressure and wi th a vent gas temperature that avoids excessive condensate production in the vent. Category IV. An appliance that operates with a positive vent static pressure and with a vent gas temperature that is capable of causing excessive condensate production in th e vent. VENTED ROOM HEATER. A vented self - contained, free - standing , nonrecessed appliance for furnishing warm air to the space in which it is installed, directly from the heater without duct connections. VENTED WALL FURNACE. A self - contained vented applian ce complete with grilles or equivalent, designed for incorporation in or permanent attachment to the structure of a building, mobile home or travel trailer, and furnishing heated air circulated by gravity or by a fan directly into the space to be heated th rough openings in the casing. This definition shall exclude floor furnaces, unit heaters and central furnaces as herein defined. VENTING SYSTEM. A continuous open passageway from the flue collar or draft hood of an appliance to the outdoor atmosphere for t he purpose of removing flue or vent gases. A venting system is usually composed of a vent or a chimney and vent connector, if used, assembled to form the open passageway. Forced - draft venting system. A portion of a venting system using a fan or other mecha nical means to cause the removal of flue or vent gases under positive static vent pressure. Induced draft venting system. A portion of a venting system using a fan or other mechanical means to cause the removal of flue or vent gases under nonpositive stati c vent pressure. Mechanical draft venting system. A venting system designed to remove flue or vent gases by mechanical means, that consists of an induced draft portion under nonpositive static pressure or a forced draft portion under positive static pressu re. Natural draft venting system. A venting system designed to remove flue or vent gases under nonpositive static vent pressure entirely by natural draft. WALL HEATER, UNVENTED - TYPE. A room heater of the type designed for insertion in or attachment to a wa ll or partition. Such heater does not incorporate concealed venting arrangements in its construction and discharges all products of combustion through the front into the room being heated. WATER HEATER. Any heating appliance or equipment that heats potable water and supplies such water to the potable hot water distribution system. 2022 NEW YORK CITY FUEL GAS CODE 2 - 1 ‡‡‡ Chapter 2 was amended by Local Law 77 of 2023 . This law has an effective date of June 10, 2023. CHAPTER 2 DEFINITIONS SECTION FGC 201 GENERAL 201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code and standard, have the meanings indicated in this chapter. 201.2 Inter changeability. Words used in the present tense include the future; words in the masculine gender in- clude the feminine and neuter; the singular number includes the plural and the plural, the singular. 201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the New York City Electrical Code , New York City Building Code , New York City Fire Code , New York City Mechanical Code , New York City Plumbing Code , or the New York City Energy Conservation Code , such terms shall have meanings ascribed to them as in those codes. ‡‡‡ 201.3.1 Terms defined in the general administrative provisions. The following terms are defined in Sec- tion 28 - 101.5 of the Administrative Code : 1968 BUILDING CODE. 1968 OR PRIOR CODE BUILDINGS OR STRUCTURES (PRIOR CODE BUILDINGS). ACCEPTANCE OR ACCEPTED. ADDITION. ADMINISTRATIVE CODE. ALTERATION. APPROVAL OR APPROVED. APPROVED AGENCY. APPROVED FABRICATOR. APPROVED INSPECTION AGENCY. APPROVED TESTING AGENCY. ARCHITECT. BUILDING. CERTIFICATE OF COMPLIANCE. CHARTER. CITY. COMMISSIONER. CONSTRUCTION DOCUMENTS. DAY. DEFERRED SUBMITTAL. DEMOLITION. DEMOLITION, FULL. DEFINITIONS 2 - 2 2022 NEW YORK CITY FUEL GAS CODE DEMOLITION, PARTIAL. DEPARTMENT. ENGINEER. ENLARGEMENT. ENVIRONMENTAL CONTROL BOARD or ECB. EXISTING BUILDING OR STRUCTUR E. FABRICATED ITEM. FIRE PROTECTION PLAN. HEREAFTER. HERETOFORE. INSPECTION CERTIFICATE. INTERIM CERTIFICATE OF OCCUPANCY. LABEL. LABELED. LAND SURVEYOR. LANDSCAPE ARCHITECT. LETTER OF COMPLETION. LIMITED ALTERATION APPLICATION. LIMITED PLUMBING ALTERATIONS. LIMITED SPRINKLER ALTERATIONS. LIMITED STANDPIPE ALTERATIONS. LISTED. MAIN USE OR DOMINANT OCCUPANCY (OF A BUILDING). MANUFACTURER’S DESIGNATION. MARK. MATERIALS. OCCUPANCY. OWNER. PARTY WALL. PERMIT. PERSON. PREMISES. PRIOR CODE BUILDING. PROFESSIONAL CERTIFICATION. PROGRESS INSPECTION. PROJECT. REGISTERED DESIGN PROFESSIONAL. REGISTERED DESIGN PROFESSIONAL OF RECORD. REQUIRED. RETAINING WALL. SERVICE EQUIPMENT. SIGN - OFF. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 3 SINGLE ROOM OCCUPANCY MULTIPLE DWELLING. SPECIAL INSPECTION . SPECIAL INSPECTION AGENCY. SPECIAL INSPECTOR. STRUCTURE. SUBMITTAL DOCUMENTS. SUPERINTENDENT OF CONSTRUCTION (CONSTRUCTION SUPERINTENDENT). USE (USED). UTILITY COMPANY OR PUBLIC UTILITY COMPANY. UTILITY CORPORATION OR PUBLIC UTILITY CORPORATION. WORK NOT CONSTITUTING MINOR ALTERATIONS OR ORDINARY REPAIRS. WRITING (WRITTEN). WRITTEN NOTICE. ZONING RESOLUTION. 201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have ordin arily accepted meanings such as the context implies. ‡‡‡ SECTION FGC 202 GENERAL DEFINITIONS ABNORMAL OPERATING CONDITION. A condition that may indicate a malfunction or a noncompliant com- ponent of a piping system or appliance. ACCESS (TO). That which enables a device, fixture, appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel, door or similar obstruction (see also “Ready access (to) ”). AIR CONDITIONER, GAS - FIRED. A gas - b urning, automatically operated appliance for supplying cooled or dehumidified air or chilled liquid. AIR CONDITIONING. The treatment of air so as to control simultaneously the temperature, humidity, cleanness and distribution of the air to meet the require ments of a conditioned space. AIR, EXHAUST. See “Exhaust.” AIR - HANDLING UNIT. A blower or fan used for the purpose of distributing supply air to a room, space or area. AIR, MAKEUP. Any combination of outdoor and transfer air intended to replace exhaust air and exfiltration. APPLIANCE. Any apparatus or device that utilizes a fuel or raw material to produce light, heat, power, refrigeration or air conditioning. APPLIANCE, AUTOMATICALLY CONTROLLED. Appliances equipped with an automatic b urner ignition and safety shutoff device and other automatic devices which accomplish complete turn - on and shutoff of the gas to the main burner or burners, and graduate the gas supply to the burner or burners, but do not affect complete shutoff of the gas . APPLIANCE TYPE. Low - heat appliance (residential appliance). Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of 1,000 ° F (538 ° C) or less. Medium - heat appliance. Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of more than 1,000 ° F (538 ° C ) or less but not greater than 2,000 ° F ( 1093 .3° C). DEFINITIONS 2 - 4 2022 NEW YORK CITY FUEL GAS CODE APPLIANCE, UNVENTED. An appliance designed or installed in such a manner that the products of combustion are not conveyed by a vent or chimney directly to the outdoor atmosphere. APPLIANCE, VENTED. An appliance designed and installed in such a manner that all of the products o f com- bustion are conveyed directly from the appliance to the outdoor atmosphere through an approved chimney or vent system. See also “VENTED APPLIANCE CATEGORIES.” ATMOSPHERIC PRESSURE. The pressure of the weight of air and water vapor on the surface of th e earth, ap- proximately 14.7 pounds per square inch (psi) (101 kPa absolute) at sea level. BAFFLE. An object placed in an appliance to change the direction of or retard the flow of air, air - gas mixtures or flue gases. BAROMETRIC DRAFT REGULATOR. A balanced damper device attached to a chimney, vent connector, breeching or flue gas manifold to protect combustion appliances by controlling chimney draft. A double - acting barometric draft regulator is one in which the balancing damper is free to move in either direction to protect combustion appliances from both excessive draft and backdraft. BOILER, HIGH - PRESSURE. An appliance for supplying steam or hot water that, for a steam boiler, operates at a pressure of more than 15 psig ( 103.4 kPa gauge), and for a hot water boiler, operates at a pressure exceeding 160 psig ( 1103 kPa gauge) or at a temperature exceeding 250° F ( 121.1 °C). BOILER, LOW - PRESSURE. A self - contained appliance for supplying steam or hot water as follows: Hot water heating boiler. A boiler in which no steam is generated, from which hot water is circulated for heating purposes and then returned to the boiler, and that operates at water pressures not exceeding 160 pounds per square inch gauge (psig) ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Hot water supply boiler. A boiler, completely fill ed with water, which furnishes hot water to be used externally to itself, and that operates at water pressures not exceeding 160 psig ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Steam heating boile r. A boiler in which steam is generated and that operates at a steam pressure not exceeding 15 psig ( 103.4 kPa gauge). BRANCH. A section of gas piping downstream from a riser, leading to appliances or equipment on no more than two consecutive floors. BRAZING. A metal - joining process wherein coalescence is produced by the use of a nonferrous filler metal having a melting point above 1,000°F ( 537.8 ° C), but lower than that of the base metal being joined. The filler material is distributed between the clos ely fitted surfaces of the joint by capillary action. BROILER. A general term including salamanders, barbecues and other appliances cooking primarily by radiated heat, excepting toasters. BTU. Abbreviation for British thermal unit, which is the quantity of heat required to raise the temperature of 1 pound (454 g) of water 1°F ( - 17.2 ° C) (1 Btu = 1055 J). BURNER. A device for the final conveyance of the gas, or a mixture of gas and air, to the combustion zone. Induced draft. A burner that depends on draft induced by a fan that is an integral part of the appliance and is located downstream from the burner. Power. A burner in which gas, air or both are supplied at pressures exceeding, for gas, the line pressure, and for air, atmospheric pressure, with t his added pressure being applied at the burner. CHIMNEY. A primarily vertical structure containing one or more flues used to remove hot gases from burning fuel, refuse, or industrial processes from a fuel - burning appliance to the outdoor atmosphere. Factor y - built chimney. A listed and labeled chimney composed of factory - made components, assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 5 Masonry chimney. A field - constructed chimney composed of solid mason ry units, bricks, stones or concrete. Metal chimney. A field - constructed chimney composed of metal. CLEARANCE. The minimum distance through air measured between the heat - producing surface of the mechanical appliance, device or equipment and the surface of the combustible material or assembly. CLOTHES DRYER. An appliance used to dry wet laundry by means of heated air. Dryer classifications are as follows: Type 1. Factory - built package, multiple production. Primarily used in family living environment. Usually the smallest unit physically and in function output. Type 2. Factory - built package, multiple production. Used in business with direct intercourse of the functi on with the public. Not designed for use in individual family living environment. COMBUSTIBLE ASSEMBLY. Wall, floor, ceiling or other assembly constructed of one or more component mate- rials that are not defined as noncombustible. COMBUSTIBLE MATERIAL. Any material not defined as noncombustible. COMBUSTION. In the context of this code, refers to the rapid oxidation of fuel accompanied by the production of heat or heat and light. COMBUSTION AIR . Air necessary for complete combustion of a fuel, including theor etical air and excess air. COMBUSTION CHAMBER. The portion of an appliance within which combustion occurs. COMBUSTION PRODUCTS. Constituents resulting from the combustion of a fuel with the oxygen of the air, including inert gases, but excluding excess air. CONCEALED LOCATION. A location that cannot be accessed without damaging permanent parts of the building structure or finished surface. Spaces above, below or behind readily removable panels or doors shall not be considered as concealed. CONCEAL ED PIPING. Piping that is located in a concealed location (see “Concealed location ”). CONDENSATE. The liquid that condenses from a gas (including flue gas) caused by a reduction in temperature or increase in pressure. CONNECTOR, APPLIANCE (Fuel). Rigid metallic pipe and fittings or a listed and labeled device that connects an appliance to the gas piping system. CONNECTOR, CHIMNEY OR VENT. The pipe that connects an appliance to a chimney or vent. CONTROL. A manual or automatic device designed to re gulate the gas, air, water or electrical supply to, or operation of, a mechanical system. CONVERSION BURNER. A unit consisting of a burner and its controls for installation in an appliance originally uti- lizing another fuel. COUNTER APPLIANCES. Appliances s uch as coffee brewers and coffee urns and any appurtenant water - heating ap- pliance, food and dish warmers, hot plates, griddles, waffle bakers and other appliances designed for installation on or in a counter. CUBIC FOOT. The amount of gas that occupies 1 c ubic foot (0.02832 m 3 ) when at a temperature of 60°F ( 15.6 ° C), saturated with water vapor and under a pressure equivalent to that of 30 inches of mercury (101 kPa). DAMPER. A manually or automatically controlled device to regulate draft or the rate of flow of air or combustion gases. DECORATIVE APPLIANCE, VENTED. A vented appliance wherein the primary function lies in the aesthetic effect of the flames. DEFINITIONS 2 - 6 2022 NEW YORK CITY FUEL GAS CODE DECORATIVE APPLIANCES FOR INSTALLATION IN VENTED FIREPLACES. A vented appliance de- signed for installa tion within the fire chamber of a vented fireplace, wherein the primary function lies in the aesthetic effect of the flames. DECORATIVE SHROUD. A listed, partial, noncombustible enclosure for aesthetic purposes that is installed at the termination of a ven ting system that surrounds or conceals a factory - built chimney system or vent cap. DEMAND. The maximum amount of gas input required per unit of time, usually expressed in cubic feet per hour (1 ft 3 = 0.0283 m 3 ), or Btu/h (1 Btu/h = 0.2931 W). DILUTION AIR. Air that is introduced into a draft hood and is mixed with the flue gases. DIRECT - VENT APPLIANCES. Appliances that are constructed and installed so that all air for combustion is derived directly from the outdo or atmosphere and all flue gases are discharged directly to the outdoor atmosphere. DRAFT. The pressure difference existing between the appliance or any component part and the atmosphere, that causes a continuous flow of air and products of combustion thro ugh the gas passages of the appliance to the atmos- phere. Induced draft. The pressure difference created by the action of a fan, blower or ejector, that is located between the appliance and the chimney or vent termination. Natural draft. The pressure difference created by a vent or chimney because of its height, and the temperature difference between the flue gases and the atmosphere. DRAFT HOOD. A nonadjustable device built into an appliance, or made as part of the vent connector from an appl iance, that is designed to (1) provide for ready escape of the flue gases from the appliance in the event of no draft, backdraft or stoppage beyond the draft hood, (2) prevent a backdraft from entering the appliance, and (3) neutralize the effect of stack action of the chimney or gas vent upon operation of the appliance. DRAFT REGULATOR. A device that functions to maintain a desired draft in the appliance by automatically reducing the draft to the desired value. DRIP. A nipple and cap placed at a low point in a system of piping to collect condensate and from which the conden- sate is removable. DRY GAS. A gas having a moisture and hydrocarbon dew point below any normal temperature to which the gas piping is exposed. DUCT FURNACE. A warm - air furnace or heater n ormally installed in an air distribution duct to supply warm air for heating. This definition shall apply only to a warm - air heating appliance that, for air circulation, depends on a blower not furnished as part of the furnace. DUCT SYSTEM. A continuous pa ssageway for the transmission of air that, in addition to ducts, includes duct fittings, dampers, plenums, fans and accessory air - handling equipment and appliances . DWELLING. A building or structure which is occupied in whole or in part as the home, residence or sleeping place of one or more families. DWELLING UNIT. A single unit consisting of one or more habitable rooms and occupied or arranged to be occupied as a unit separa te from all other units within a dwelling. EQUIPMENT. Any apparatus or device that delivers gas as a fuel or raw material to an appliance or vents combustion products from an appliance, including but not limited to control devices, pressure regulators, val ves, appliance appurtenances, gas connectors, or power exhausters used in connections to appliances. EXCESS FLOW VALVE (EFV). A safety shut - off valve designed to activate to interrupt the flow of gas when the fuel gas passing through it exceeds a prescribe d flow rate. Installed where specifically required by code or utility company. EXHAUST. Air being removed from any space, appliance or piece of equipment conveyed directly to the atmosphere by means of openings or ducts. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 7 EXTERIOR MASONRY CHIMNEYS. Masonry chimneys exposed to the outdoors on one or more sides below the roof line. FIREPLACE. An assembly consisting of a hearth and fire chamber of noncombustible material and provided with a chimney , for use with solid fuels. Factory - built fireplace. A listed and labeled fireplace and chimney system composed of factory - made compo- nents , and assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. Masonry fireplace. A hearth and fire chamber of s olid masonry units such as bricks, stones, listed masonry units or reinforced concrete, provided with a suitable chimney. FLAME SAFEGUARD. A device that will automatically shut off the fuel supply to a main burner or group of burners when the means of igni tion of such burners becomes inoperative, and when flame failure occurs on the burner or group of burners. FLASHBACK ARRESTOR CHECK VALVE. A device that will prevent the backflow of one gas into the supply system of another gas and prevent the passage of flame into the gas supply system. FLOOR FURNACE. A completely self - contained furnace suspended from the floor of the space being heated, ta king air for combustion from outside such space and with means for observing flames and lighting the appliance from such space. Fan type. A floor furnace equipped with a fan that provides the primary means for circulating air. Gravity type. A floor furnace depending primarily on circulation of air by gravity. This classification shall also include floor furnaces equipped with booster - type fans that do not materially restrict free circulation of air by gravity flow when such fans are not in operation. FLUE. A passageway within a chimney or vent through which gaseous combustion products pass. FLUE, APPLIANCE. The passage(s) within an appliance through which combustion products pass from the combustion chamber of the appliance to the draft hood inlet opening on an appliance equipped with a draft hood or to the outlet of the appliance on an appliance not equipped with a draft hood. FLUE COLLAR. That portion of an appliance designed for the attachment of a draft hood, vent connector or venting system. FL UE GASES. Products of combustion plus excess air in fireplace and appliance flues or heat exchangers. FLUE LINER (LINING). A system or material used to form the inside surface of a flue in a chimney or vent, for the purpose of protecting the surrounding st ructure from the effects of combustion products and for conveying combustion products without leakage into the atmosphere. FUEL GAS. A natural gas, manufactured gas, liquefied petroleum gas or mixtures of these gases. FURNACE. A completely self - contained h eating unit that is designed to supply heated air to spaces remote from or adjacent to the appliance location. FURNACE, CENTRAL. A self - contained appliance for heating air by transfer of heat of combustion through metal to the air, and designed to supply h eated air through ducts to spaces remote from or adjacent to the appliance location. Forced - air type. A central furnace equipped with a fan or blower that provides the primary means for circulation of air. FURNACE PLENUM. An air compartment or chamber to which one or more ducts are connected and that forms part of an air distribution system. GAS CONVENIENCE OUTLET. A permanently mounted, manually operated device that provides the means for connecting an appliance to, and d isconnecting an appliance from, the supply piping. The device includes an integral, manually operated valve with a nondisplaceable valve member and is designed so that disconnection of an appliance only occurs when the manually operated valve is in the clo sed position. DEFINITIONS 2 - 8 2022 NEW YORK CITY FUEL GAS CODE GAS PIPING. An installation of pipe, valves or fittings installed on a premises or in a building and utilized to convey fuel gas. GAS UTILIZATION EQUIPMENT. An appliance that utilizes gas as a fuel or raw material or both. HAZARDOUS LOCATION. Any location considered to be a fire hazard for flammable vapors, dust, combustible fibers or other highly combustible substances. The location is not necessarily categorized in the New York City Building Code as a high - hazard group classification. HOUSE PIPING. See “Piping system.” HYDROGEN FUEL GAS ROOM. A separately ventilated, fully enclosed room designed to exclusively house the generation of gaseous hydrogen for immediate on - premises use in indoor fuel cells or other energy production process, and incidental indoor storage of gaseous hydrogen. A hydro gen fuel gas room is not intended to house the production or dispensing of hydrogen motor fuel. IGNITION SOURCE. A flame, spark or hot surface capable of igniting flammable vapors or fumes. Such sources include appliance burners, burner ignitors, and elect rical switching devices. INCINERATOR. An appliance used to reduce combustible refuse material to ashes and that is manufactured, sold and installed as a complete unit. INDUSTRIAL AIR HEATERS, NONRECIRCULATING DIRECT - FIRED . A heater in which all the product s of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating only outdoor air. INDUSTRIAL AIR HEATERS, RECIRCULATING DIRECT - FIRED . A heater in which all the pro ducts of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating outdoor air, and, if applicable, indoor air. INFRARED RADIANT HEATER. A heater that directs a s ubstantial amount of its energy output in the form of infrared radiant energy into the area to be heated. Such heaters are of either the vented or unvented type. INTEGRAL VENT APPLIANCES. Appliances designed for outdoor installation that have built - in natu ral or me- chanical venting means and are constructed and installed so that all air for combustion is derived from the outdoor atmosphere and all flue gases are discharged to the outdoor atmosphere through an integral vent termination. INTERLOCK. A device actuated by another device with which it is directly associated, to govern succeeding oper- ations of the same or allied devices. A circuit in which a given action cannot occur until after one or more other actions have taken place. JOINT, FLANGED. A joint made by bolting together a pair of flanged ends. JOINT, FLARED. A metal - to - metal compression joint in which a conical spread is made on the end of a tube that is compressed by a flare nut against a mating flare. JOINT, MECHANICAL. A general form o f gas - tight joints obtained by the joining of metal parts through a positive - holding mechanical construction, such as press joint, flanged joint, threaded joint, flared joint or compression joint. JOINT, PLASTIC ADHESIVE. A joint made in thermoset plastic piping by the use of an adhesive substance that forms a continuous bond between the mating surfaces without dissolving either one of them. JOINT, PLASTIC HEAT FUSION. A joint made in thermoplastic piping by heating the parts sufficiently to permit fusion o f the materials when the parts are pressed together. JOINT, WELDED. A gas - tight joint obtained by the joining of metal parts in molten state. LEAK CHECK. An operation performed on a gas piping system to verify that the system does not leak. Leakage checks are intended to discover open outlets, defective appliance connection and defects that have developed since the initial installation, normally performed after pressure testing. LIMIT CONTROL. A device responsive to changes in pressure, temperature or level for turning on, shutting off or throttling the gas supply to an appliance. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 9 LIQUEFIED PETROLEUM GAS or LPG (LP - GAS). Liquefied petroleum gas composed predominately of pro- pane, propylene, buta nes or butylenes, or mixtures thereof that is gaseous under normal atmospheric conditions, but is capable of being liquefied under moderate pressure at normal temperatures. LIVING SPACE. Space within a dwelling unit utilized for living, sleeping, eating, c ooking, bathing, washing and sanitation purposes. LOG LIGHTER. A manually operated solid fuel ignition appliance for installation in a vented solid fuel - burning fireplace. MAIN BURNER. A device or group of devices essentially forming an integral unit for t he final conveyance of gas or a mixture of gas and air to the combustion zone, and in which combustion takes place to accomplish the function for which the appliance is designed. METER. The instrument installed to measure the volume of gas delivered throug h it. NPS. An abbreviation for “Nominal pipe size.” NONCOMBUSTIBLE MATERIALS. Materials that, when tested in accordance with ASTM E 136, have at least three of four specimens tested meeting all of the following criteria: 1. The recorded temperature of the surface and interior thermocouples shall not at any time during the test rise more than 54ºF (12.2ºC) above the furnace temperature at the beginning of the test. 2. There shall not be flaming from the specimen after the first 30 seconds. 3. If the weight l oss of the specimen during testing exceeds 50 percent, the recorded temperature of the surface and interior thermocouples shall not at any time during the test rise above the furnace air temperature at the beginning of the test, and there shall not be flam ing of the specimen. OFFSET (VENT). A combination of approved bends that makes two changes in direction bringing one section of the vent out of line but into a line parallel with the other section. ORIFICE. The opening in a cap, spud or other device whereb y the flow of gas is limited and through which the gas is discharged to the burner. OUTLET. The point at which a gas - fired appliance connects to the gas piping system. OXYGEN DEPLETION SAFETY SHUTOFF SYSTEM (ODS). A system designed to act to shut off the g as sup- ply to the main and pilot burners if the oxygen in the surrounding atmosphere is reduced below a predetermined level. PILOT. A small flame that is utilized to ignite the gas at the main burner or burners. PIPING. Where used in this code, “piping” refers to either pipe or tubing, or both. Pipe. A rigid conduit of iron, steel, copper, brass or plastic. Tubing. Semirigid conduit of copper, aluminum, plastic or steel. PIPING SYSTEM. All fuel piping, valves and fitting s from the outlet of the point of delivery to the outlets of the appliance shutoff valves. PLASTIC, THERMOPLASTIC. A plastic that is capable of being repeatedly softened by increase of temperature and hardened by decrease of temperature. POINT OF DELIVERY. For natural gas systems, the point of delivery is the outlet of the service meter assembly or the outlet of the service regulator or service shutoff valve where a meter is not provided. Where a valve is provided at the outlet of the service meter assembly, such valve shall be considered to be downstream of the point of delivery. PORTABLE FUEL CELL APPLIANCE. A fuel cell generator of electricity, which is not fixed in place. A portable fuel cell appliance utilizes a cord and plug connection to a gr id - isolated load and has an integral fuel supply. PRESSURE DROP. The loss in pressure due to friction or obstruction in pipes, valves, fittings, regulators and burn- ers. DEFINITIONS 2 - 10 2022 NEW YORK CITY FUEL GAS CODE PRESSURE TEST. An operation performed to verify the gas - tight integrity of gas piping f ollowing its installation or modification. PURGE. To free a gas conduit of air or gas, or a mixture of gas and air. QUICK - DISCONNECT DEVICE. A hand - operated device that provides a means for connecting and disconnecting an appliance or an appliance connecto r to a gas supply and that is equipped with an automatic means to shut off the gas supply when the device is disconnected. READY ACCESS (TO). That which enables a device, fixture, appliance or equipment to be directly reached, without requiring the removal or movement of any panel, door or similar obstruction (see “Access (to) ”). REGULATOR. A device for controlling and maintaining a uniform supply pressure, either pounds - to - inches water column (MP regulator) or inches - to - inches water column (appliance regulator). REGULATOR, GAS APPLIANCE. A pressure regulator for controlling pressure to the manifold of the appliance. Types of appliance regulators are as follows: Adjustable. 1. Spring type, limited adjustment. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, the loading of which is adjus table over a range of not more than 15 percent of the outlet pressure at the midpoint of the adjustment range. 2. Spring type, standard adjustment. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, th e loading of which is adjustable. The adjustment means shall be con- cealed. Multistage. A regulator for use with a single gas whose adjustment means is capable of being positioned manually or automatically to two or more predetermined outlet pressure settin gs. Each of these settings shall be adjustable or nonadjustable. The regulator may modulate outlet pressures automatically between its maximum and minimum predetermined outlet pressure settings. Nonadjustable. 1. Spring type, nonadjustable. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, the loading of which is not field adjustable. 2. Weight type. A regulator in which the regulating force acting upon the diaphragm is derived from a weight or combina tion of weights. REGULATOR, LINE GAS PRESSURE. A device placed in a gas line between the service pressure regulator and the appliance for controlling, maintaining or reducing the pressure in that portion of the piping system downstream of the device. REGUL ATOR, MEDIUM - PRESSURE (MP Regulator). A line pressure regulator that reduces gas pressure from the range of greater than 0.5 psig (3.4 kPa) and less than or equal to 5 psig (34.5 kPa) to a lower pressure. REGULATOR, PRESSURE. A device placed in a gas line for reducing, controlling and maintaining the pressure in that portion of the piping system downstream of the device. REGULATOR, SERVICE PRESSURE. A device installed by the serving gas supplier to reduce and limit the ser- vice line pressure to delivery pres sure. RELIEF OPENING. The opening provided in a draft hood to permit the ready escape to the atmosphere of the flue products from the draft hood in the event of no draft, back draft or stoppage beyond the draft hood, and to permit air into the draft hood i n the event of a strong chimney updraft. RELIEF VALVE (DEVICE). A safety valve designed to forestall the development of a dangerous condition by relieving either pressure, temperature or vacuum . RELIEF VALVE, PRESSURE. An automatic valve that opens and clo ses a relief vent, depending on whether the pressure is above or below a predetermined value. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 11 RELIEF VALVE, TEMPERATURE. Manual reset type. A valve that automatically opens a relief vent at a predetermined temperature and that must be manually returned to the closed position. Reseating or self - closing type. An automatic valve that opens and closes a relief vent, depending on whether the temperature is above or below a predetermined value. RELIEF VALVE, VACUUM. A valve that automatically opens and closes a v ent for relieving a vacuum within the hot water supply system, depending on whether the vacuum is above or below a predetermined value. RISER, GAS. A vertical pipe supplying fuel gas that extends one full story or more . ROOM HEATER, UNVENTED. See “Unvented room heater.” ROOM HEATER, VENTED. See “Vented room heater. ” ROUGH - IN. Parts of the gas system that are installed prior to the installation of appliances or equipment. This in- cludes gas piping, all the necessary supports and any appliances that are built into the structure. SAFETY SHUTOFF DEVICE. See “Flame safeguard.” SERVI CE PIPING. All fuel - gas piping, valves and fittings upstream of the point of delivery. SHAFT. An enclosed space extending through one or more stories of a building, connecting vertical openings in successive floors, or floors and the roof. SLEEPING UNIT. A dwelling unit, which may contain either toilet or kitchen facilities but not both. Any sleeping unit housing more than one family shall also be classified as a congregate living unit. The creation of or conversion to sleeping units shall be limited by Sec tion 27 - 2077 of the New York City Housing Maintenance Code . SPECIFIC GRAVITY. As applied to gas, specific gravity is the ratio of the weight of a given volume to that of the same volume of air, both measured under the same condition. STATIONARY FUEL CELL P OWER PLANT. A self - contained package or factory - matched packages that con- stitute an automatically operated assembly of integrated systems for generating electrical energy and recoverable ther- mal energy that is permanently connected and fixed in place. THER MOSTAT. Electric switch type. A device that senses changes in temperature and controls electrically, by means of separate components, the flow of gas to the burner(s) to maintain selected temperatures. Integral gas valve type. An automatic device, actuated by temperature changes, desi gned to control the gas supply to the burner(s) in order to maintain temperatures between predetermined limits, and in which the thermal actuating element is an integral part of the device. 1. Graduating thermostat. A thermostat in which the motion of the valve is approximately in direct proportion to the effective motion of the thermal element induced by temperature change. 2. Snap - acting thermostat. A thermostat in which the thermostatic valve travels instantly from the closed to the open position, and vi ce versa. THIRD - PARTY CERTIFICATION AGENCY. An approved agency operating a product or material certification system that incorporates initial product testing, assessment and surveillance of a manufacturer’s quality control sys- tem. THIRD - PARTY CERTIFIED. Ce rtification obtained by the manufacturer indicating that the function and perfor- mance characteristics of a product or material have been determined by testing and ongoing surveillance by an ap- proved third - party certification agency. Assertion of certificat ion is in the form of identification in accordance with the requirements of the third - party certification agency. THIRD - PARTY TESTED. Procedure by which an approved testing laboratory provides documentation that a prod- uct, material or system conforms to sp ecified requirements. DEFINITIONS 2 - 12 2022 NEW YORK CITY FUEL GAS CODE TRANSITION FITTINGS, PLASTIC TO STEEL. An adapter for joining plastic pipe to steel pipe. The purpose of this fitting is to provide a permanent, pressure - tight connection between two materials that cannot be joined directly one to ano ther. UNIT HEATER .High - static pressure type. A self - contained, automatically controlled, vented appliance having integral means for circulation of air against 0.2 inch (15 mm H 2 O) or greater static pressure. Such appliance is equipped with provisions for attaching an outlet air duct and, where the appliance is for indoor installation remote from the space to be heated, is also equipped with provisions for attaching an inlet air duct. Low - static pressure type. A self - contained, automatically controlled, ven ted appliance, intended for installation in the space to be heated without the use of ducts, having integral means for circulation of air. Such units are allowed to be equipped with louvers or face extensions made in accordance with the manufacturer’s spec ifications. UNLISTED BOILER. A boiler not listed by a nationally recognized testing agency. UNVENTED ROOM HEATER. An unvented heating appliance designed for stationary installation and utilized to provide comfort heating. Such appliance provides radiant he at or convection heat by gravity or fan circulation directly from the heater and does not utilize ducts. VALVE. A device used in piping to control the gas supply to any section of a system of piping or to an appliance. Appliance shutoff. A valve located in the piping system, used to isolate individual appliances for purposes such as service or replacement. Automatic. An automatic or semiautomatic device consisting essentially of a valve and operator that control the gas supply to the burner(s) during operat ion of an appliance. The operator shall be actuated by application of gas pressure on a flexible diaphragm, by electrical means, by mechanical means, or by other approved means. Automatic gas shutoff. A valve used in conjunction with an automatic gas shuto ff device to shut off the gas supply to a system . It shall be constructed integrally with the gas shutoff device or shall be a separate assembly. Individual main burner. A valve that controls the gas supply to an individual main burner. Main burner control. A valve that controls the gas supply to the main burner manifold. Manual main gas - control. A manually operated valve in the gas line for the purpose of completely turning on or shutting off the gas supply to the appliance, except to pilot or pilots that are provided with independent shutoff. Manual reset. An automatic shutoff valve installed in the gas supply piping and set to shut off when unsafe con- ditions occur. The device remains closed until manually reopened. Service shutoff. A valve, installed by the serving gas supplier between the service meter or source of supply and the customer pipin g system, to shut off the entire piping system. VENT. A pipe or other conduit composed of factory - made components, containing a passageway for conveying com- bustion products and air to the atmosphere, listed and labeled for use with a specific type or class of appliance. Special gas vent. A vent listed and labeled for use with listed Category II, III and IV appliances. Type B vent. A vent listed and labeled for use with appliances with draft hoods and other Category I appliances that are listed for use with Type B vents. Type BW vent. A vent listed and labeled for use with wall furnaces. Type L vent. A vent listed and labeled for use with appliances that are listed for use with Type L or Type B vents. VENT CONNECTOR. See “Connector. ” VENT GASES. Products of c ombustion from appliances plus excess air plus dilution air in the vent connector, gas vent or chimney above the draft hood or draft regulator. VENT PIPING. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 13 Breather. Piping run from a pressure - regulating device to the outdoors, designed to provide a refer ence to atmos- pheric pressure. If the device incorporates an integral pressure relief mechanism, a breather vent can also serve as a relief vent. Relief. Piping run from a pressure - regulating or pressure - limiting device to the outdoors, designed to provide for the safe venting of gas in the event of excessive pressure in the gas piping system. VENTED APPLIANCE CATEGORIES. Appliances that are categorized for the purpose of vent selection are clas- sified into the following four categories: Category I. An applia nce that operates with a nonpositive vent static pressure and with a vent gas temperature that avoids excessive condensate production in the vent. Category II. An appliance that operates with a nonpositive vent static pressure and with a vent gas temperature that is capable of causing excessive condensate production in the vent. Category III. An appliance that operates with a positive vent static pressure and wi th a vent gas temperature that avoids excessive condensate production in the vent. Category IV. An appliance that operates with a positive vent static pressure and with a vent gas temperature that is capable of causing excessive condensate production in th e vent. VENTED ROOM HEATER. A vented self - contained, free - standing , nonrecessed appliance for furnishing warm air to the space in which it is installed, directly from the heater without duct connections. VENTED WALL FURNACE. A self - contained vented applian ce complete with grilles or equivalent, designed for incorporation in or permanent attachment to the structure of a building, mobile home or travel trailer, and furnishing heated air circulated by gravity or by a fan directly into the space to be heated th rough openings in the casing. This definition shall exclude floor furnaces, unit heaters and central furnaces as herein defined. VENTING SYSTEM. A continuous open passageway from the flue collar or draft hood of an appliance to the outdoor atmosphere for t he purpose of removing flue or vent gases. A venting system is usually composed of a vent or a chimney and vent connector, if used, assembled to form the open passageway. Forced - draft venting system. A portion of a venting system using a fan or other mecha nical means to cause the removal of flue or vent gases under positive static vent pressure. Induced draft venting system. A portion of a venting system using a fan or other mechanical means to cause the removal of flue or vent gases under nonpositive stati c vent pressure. Mechanical draft venting system. A venting system designed to remove flue or vent gases by mechanical means, that consists of an induced draft portion under nonpositive static pressure or a forced draft portion under positive static pressu re. Natural draft venting system. A venting system designed to remove flue or vent gases under nonpositive static vent pressure entirely by natural draft. WALL HEATER, UNVENTED - TYPE. A room heater of the type designed for insertion in or attachment to a wa ll or partition. Such heater does not incorporate concealed venting arrangements in its construction and discharges all products of combustion through the front into the room being heated. WATER HEATER. Any heating appliance or equipment that heats potable water and supplies such water to the potable hot water distribution system. 2022 NEW YORK CITY FUEL GAS CODE 2 - 1 ‡‡‡ Chapter 2 was amended by Local Law 77 of 2023 . This law has an effective date of June 10, 2023. CHAPTER 2 DEFINITIONS SECTION FGC 201 GENERAL 201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code and standard, have the meanings indicated in this chapter. 201.2 Inter changeability. Words used in the present tense include the future; words in the masculine gender in- clude the feminine and neuter; the singular number includes the plural and the plural, the singular. 201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the New York City Electrical Code , New York City Building Code , New York City Fire Code , New York City Mechanical Code , New York City Plumbing Code , or the New York City Energy Conservation Code , such terms shall have meanings ascribed to them as in those codes. ‡‡‡ 201.3.1 Terms defined in the general administrative provisions. The following terms are defined in Sec- tion 28 - 101.5 of the Administrative Code : 1968 BUILDING CODE. 1968 OR PRIOR CODE BUILDINGS OR STRUCTURES (PRIOR CODE BUILDINGS). ACCEPTANCE OR ACCEPTED. ADDITION. ADMINISTRATIVE CODE. ALTERATION. APPROVAL OR APPROVED. APPROVED AGENCY. APPROVED FABRICATOR. APPROVED INSPECTION AGENCY. APPROVED TESTING AGENCY. ARCHITECT. BUILDING. CERTIFICATE OF COMPLIANCE. CHARTER. CITY. COMMISSIONER. CONSTRUCTION DOCUMENTS. DAY. DEFERRED SUBMITTAL. DEMOLITION. DEMOLITION, FULL. DEFINITIONS 2 - 2 2022 NEW YORK CITY FUEL GAS CODE DEMOLITION, PARTIAL. DEPARTMENT. ENGINEER. ENLARGEMENT. ENVIRONMENTAL CONTROL BOARD or ECB. EXISTING BUILDING OR STRUCTUR E. FABRICATED ITEM. FIRE PROTECTION PLAN. HEREAFTER. HERETOFORE. INSPECTION CERTIFICATE. INTERIM CERTIFICATE OF OCCUPANCY. LABEL. LABELED. LAND SURVEYOR. LANDSCAPE ARCHITECT. LETTER OF COMPLETION. LIMITED ALTERATION APPLICATION. LIMITED PLUMBING ALTERATIONS. LIMITED SPRINKLER ALTERATIONS. LIMITED STANDPIPE ALTERATIONS. LISTED. MAIN USE OR DOMINANT OCCUPANCY (OF A BUILDING). MANUFACTURER’S DESIGNATION. MARK. MATERIALS. OCCUPANCY. OWNER. PARTY WALL. PERMIT. PERSON. PREMISES. PRIOR CODE BUILDING. PROFESSIONAL CERTIFICATION. PROGRESS INSPECTION. PROJECT. REGISTERED DESIGN PROFESSIONAL. REGISTERED DESIGN PROFESSIONAL OF RECORD. REQUIRED. RETAINING WALL. SERVICE EQUIPMENT. SIGN - OFF. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 3 SINGLE ROOM OCCUPANCY MULTIPLE DWELLING. SPECIAL INSPECTION . SPECIAL INSPECTION AGENCY. SPECIAL INSPECTOR. STRUCTURE. SUBMITTAL DOCUMENTS. SUPERINTENDENT OF CONSTRUCTION (CONSTRUCTION SUPERINTENDENT). USE (USED). UTILITY COMPANY OR PUBLIC UTILITY COMPANY. UTILITY CORPORATION OR PUBLIC UTILITY CORPORATION. WORK NOT CONSTITUTING MINOR ALTERATIONS OR ORDINARY REPAIRS. WRITING (WRITTEN). WRITTEN NOTICE. ZONING RESOLUTION. 201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have ordin arily accepted meanings such as the context implies. ‡‡‡ SECTION FGC 202 GENERAL DEFINITIONS ABNORMAL OPERATING CONDITION. A condition that may indicate a malfunction or a noncompliant com- ponent of a piping system or appliance. ACCESS (TO). That which enables a device, fixture, appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel, door or similar obstruction (see also “Ready access (to) ”). AIR CONDITIONER, GAS - FIRED. A gas - b urning, automatically operated appliance for supplying cooled or dehumidified air or chilled liquid. AIR CONDITIONING. The treatment of air so as to control simultaneously the temperature, humidity, cleanness and distribution of the air to meet the require ments of a conditioned space. AIR, EXHAUST. See “Exhaust.” AIR - HANDLING UNIT. A blower or fan used for the purpose of distributing supply air to a room, space or area. AIR, MAKEUP. Any combination of outdoor and transfer air intended to replace exhaust air and exfiltration. APPLIANCE. Any apparatus or device that utilizes a fuel or raw material to produce light, heat, power, refrigeration or air conditioning. APPLIANCE, AUTOMATICALLY CONTROLLED. Appliances equipped with an automatic b urner ignition and safety shutoff device and other automatic devices which accomplish complete turn - on and shutoff of the gas to the main burner or burners, and graduate the gas supply to the burner or burners, but do not affect complete shutoff of the gas . APPLIANCE TYPE. Low - heat appliance (residential appliance). Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of 1,000 ° F (538 ° C) or less. Medium - heat appliance. Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of more than 1,000 ° F (538 ° C ) or less but not greater than 2,000 ° F ( 1093 .3° C). DEFINITIONS 2 - 4 2022 NEW YORK CITY FUEL GAS CODE APPLIANCE, UNVENTED. An appliance designed or installed in such a manner that the products of combustion are not conveyed by a vent or chimney directly to the outdoor atmosphere. APPLIANCE, VENTED. An appliance designed and installed in such a manner that all of the products o f com- bustion are conveyed directly from the appliance to the outdoor atmosphere through an approved chimney or vent system. See also “VENTED APPLIANCE CATEGORIES.” ATMOSPHERIC PRESSURE. The pressure of the weight of air and water vapor on the surface of th e earth, ap- proximately 14.7 pounds per square inch (psi) (101 kPa absolute) at sea level. BAFFLE. An object placed in an appliance to change the direction of or retard the flow of air, air - gas mixtures or flue gases. BAROMETRIC DRAFT REGULATOR. A balanced damper device attached to a chimney, vent connector, breeching or flue gas manifold to protect combustion appliances by controlling chimney draft. A double - acting barometric draft regulator is one in which the balancing damper is free to move in either direction to protect combustion appliances from both excessive draft and backdraft. BOILER, HIGH - PRESSURE. An appliance for supplying steam or hot water that, for a steam boiler, operates at a pressure of more than 15 psig ( 103.4 kPa gauge), and for a hot water boiler, operates at a pressure exceeding 160 psig ( 1103 kPa gauge) or at a temperature exceeding 250° F ( 121.1 °C). BOILER, LOW - PRESSURE. A self - contained appliance for supplying steam or hot water as follows: Hot water heating boiler. A boiler in which no steam is generated, from which hot water is circulated for heating purposes and then returned to the boiler, and that operates at water pressures not exceeding 160 pounds per square inch gauge (psig) ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Hot water supply boiler. A boiler, completely fill ed with water, which furnishes hot water to be used externally to itself, and that operates at water pressures not exceeding 160 psig ( 1103 kPa gauge) and at water temperatures not exceeding 250°F ( 121 .1 ° C) at or near the boiler outlet. Steam heating boile r. A boiler in which steam is generated and that operates at a steam pressure not exceeding 15 psig ( 103.4 kPa gauge). BRANCH. A section of gas piping downstream from a riser, leading to appliances or equipment on no more than two consecutive floors. BRAZING. A metal - joining process wherein coalescence is produced by the use of a nonferrous filler metal having a melting point above 1,000°F ( 537.8 ° C), but lower than that of the base metal being joined. The filler material is distributed between the clos ely fitted surfaces of the joint by capillary action. BROILER. A general term including salamanders, barbecues and other appliances cooking primarily by radiated heat, excepting toasters. BTU. Abbreviation for British thermal unit, which is the quantity of heat required to raise the temperature of 1 pound (454 g) of water 1°F ( - 17.2 ° C) (1 Btu = 1055 J). BURNER. A device for the final conveyance of the gas, or a mixture of gas and air, to the combustion zone. Induced draft. A burner that depends on draft induced by a fan that is an integral part of the appliance and is located downstream from the burner. Power. A burner in which gas, air or both are supplied at pressures exceeding, for gas, the line pressure, and for air, atmospheric pressure, with t his added pressure being applied at the burner. CHIMNEY. A primarily vertical structure containing one or more flues used to remove hot gases from burning fuel, refuse, or industrial processes from a fuel - burning appliance to the outdoor atmosphere. Factor y - built chimney. A listed and labeled chimney composed of factory - made components, assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 5 Masonry chimney. A field - constructed chimney composed of solid mason ry units, bricks, stones or concrete. Metal chimney. A field - constructed chimney composed of metal. CLEARANCE. The minimum distance through air measured between the heat - producing surface of the mechanical appliance, device or equipment and the surface of the combustible material or assembly. CLOTHES DRYER. An appliance used to dry wet laundry by means of heated air. Dryer classifications are as follows: Type 1. Factory - built package, multiple production. Primarily used in family living environment. Usually the smallest unit physically and in function output. Type 2. Factory - built package, multiple production. Used in business with direct intercourse of the functi on with the public. Not designed for use in individual family living environment. COMBUSTIBLE ASSEMBLY. Wall, floor, ceiling or other assembly constructed of one or more component mate- rials that are not defined as noncombustible. COMBUSTIBLE MATERIAL. Any material not defined as noncombustible. COMBUSTION. In the context of this code, refers to the rapid oxidation of fuel accompanied by the production of heat or heat and light. COMBUSTION AIR . Air necessary for complete combustion of a fuel, including theor etical air and excess air. COMBUSTION CHAMBER. The portion of an appliance within which combustion occurs. COMBUSTION PRODUCTS. Constituents resulting from the combustion of a fuel with the oxygen of the air, including inert gases, but excluding excess air. CONCEALED LOCATION. A location that cannot be accessed without damaging permanent parts of the building structure or finished surface. Spaces above, below or behind readily removable panels or doors shall not be considered as concealed. CONCEAL ED PIPING. Piping that is located in a concealed location (see “Concealed location ”). CONDENSATE. The liquid that condenses from a gas (including flue gas) caused by a reduction in temperature or increase in pressure. CONNECTOR, APPLIANCE (Fuel). Rigid metallic pipe and fittings or a listed and labeled device that connects an appliance to the gas piping system. CONNECTOR, CHIMNEY OR VENT. The pipe that connects an appliance to a chimney or vent. CONTROL. A manual or automatic device designed to re gulate the gas, air, water or electrical supply to, or operation of, a mechanical system. CONVERSION BURNER. A unit consisting of a burner and its controls for installation in an appliance originally uti- lizing another fuel. COUNTER APPLIANCES. Appliances s uch as coffee brewers and coffee urns and any appurtenant water - heating ap- pliance, food and dish warmers, hot plates, griddles, waffle bakers and other appliances designed for installation on or in a counter. CUBIC FOOT. The amount of gas that occupies 1 c ubic foot (0.02832 m 3 ) when at a temperature of 60°F ( 15.6 ° C), saturated with water vapor and under a pressure equivalent to that of 30 inches of mercury (101 kPa). DAMPER. A manually or automatically controlled device to regulate draft or the rate of flow of air or combustion gases. DECORATIVE APPLIANCE, VENTED. A vented appliance wherein the primary function lies in the aesthetic effect of the flames. DEFINITIONS 2 - 6 2022 NEW YORK CITY FUEL GAS CODE DECORATIVE APPLIANCES FOR INSTALLATION IN VENTED FIREPLACES. A vented appliance de- signed for installa tion within the fire chamber of a vented fireplace, wherein the primary function lies in the aesthetic effect of the flames. DECORATIVE SHROUD. A listed, partial, noncombustible enclosure for aesthetic purposes that is installed at the termination of a ven ting system that surrounds or conceals a factory - built chimney system or vent cap. DEMAND. The maximum amount of gas input required per unit of time, usually expressed in cubic feet per hour (1 ft 3 = 0.0283 m 3 ), or Btu/h (1 Btu/h = 0.2931 W). DILUTION AIR. Air that is introduced into a draft hood and is mixed with the flue gases. DIRECT - VENT APPLIANCES. Appliances that are constructed and installed so that all air for combustion is derived directly from the outdo or atmosphere and all flue gases are discharged directly to the outdoor atmosphere. DRAFT. The pressure difference existing between the appliance or any component part and the atmosphere, that causes a continuous flow of air and products of combustion thro ugh the gas passages of the appliance to the atmos- phere. Induced draft. The pressure difference created by the action of a fan, blower or ejector, that is located between the appliance and the chimney or vent termination. Natural draft. The pressure difference created by a vent or chimney because of its height, and the temperature difference between the flue gases and the atmosphere. DRAFT HOOD. A nonadjustable device built into an appliance, or made as part of the vent connector from an appl iance, that is designed to (1) provide for ready escape of the flue gases from the appliance in the event of no draft, backdraft or stoppage beyond the draft hood, (2) prevent a backdraft from entering the appliance, and (3) neutralize the effect of stack action of the chimney or gas vent upon operation of the appliance. DRAFT REGULATOR. A device that functions to maintain a desired draft in the appliance by automatically reducing the draft to the desired value. DRIP. A nipple and cap placed at a low point in a system of piping to collect condensate and from which the conden- sate is removable. DRY GAS. A gas having a moisture and hydrocarbon dew point below any normal temperature to which the gas piping is exposed. DUCT FURNACE. A warm - air furnace or heater n ormally installed in an air distribution duct to supply warm air for heating. This definition shall apply only to a warm - air heating appliance that, for air circulation, depends on a blower not furnished as part of the furnace. DUCT SYSTEM. A continuous pa ssageway for the transmission of air that, in addition to ducts, includes duct fittings, dampers, plenums, fans and accessory air - handling equipment and appliances . DWELLING. A building or structure which is occupied in whole or in part as the home, residence or sleeping place of one or more families. DWELLING UNIT. A single unit consisting of one or more habitable rooms and occupied or arranged to be occupied as a unit separa te from all other units within a dwelling. EQUIPMENT. Any apparatus or device that delivers gas as a fuel or raw material to an appliance or vents combustion products from an appliance, including but not limited to control devices, pressure regulators, val ves, appliance appurtenances, gas connectors, or power exhausters used in connections to appliances. EXCESS FLOW VALVE (EFV). A safety shut - off valve designed to activate to interrupt the flow of gas when the fuel gas passing through it exceeds a prescribe d flow rate. Installed where specifically required by code or utility company. EXHAUST. Air being removed from any space, appliance or piece of equipment conveyed directly to the atmosphere by means of openings or ducts. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 7 EXTERIOR MASONRY CHIMNEYS. Masonry chimneys exposed to the outdoors on one or more sides below the roof line. FIREPLACE. An assembly consisting of a hearth and fire chamber of noncombustible material and provided with a chimney , for use with solid fuels. Factory - built fireplace. A listed and labeled fireplace and chimney system composed of factory - made compo- nents , and assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing. Masonry fireplace. A hearth and fire chamber of s olid masonry units such as bricks, stones, listed masonry units or reinforced concrete, provided with a suitable chimney. FLAME SAFEGUARD. A device that will automatically shut off the fuel supply to a main burner or group of burners when the means of igni tion of such burners becomes inoperative, and when flame failure occurs on the burner or group of burners. FLASHBACK ARRESTOR CHECK VALVE. A device that will prevent the backflow of one gas into the supply system of another gas and prevent the passage of flame into the gas supply system. FLOOR FURNACE. A completely self - contained furnace suspended from the floor of the space being heated, ta king air for combustion from outside such space and with means for observing flames and lighting the appliance from such space. Fan type. A floor furnace equipped with a fan that provides the primary means for circulating air. Gravity type. A floor furnace depending primarily on circulation of air by gravity. This classification shall also include floor furnaces equipped with booster - type fans that do not materially restrict free circulation of air by gravity flow when such fans are not in operation. FLUE. A passageway within a chimney or vent through which gaseous combustion products pass. FLUE, APPLIANCE. The passage(s) within an appliance through which combustion products pass from the combustion chamber of the appliance to the draft hood inlet opening on an appliance equipped with a draft hood or to the outlet of the appliance on an appliance not equipped with a draft hood. FLUE COLLAR. That portion of an appliance designed for the attachment of a draft hood, vent connector or venting system. FL UE GASES. Products of combustion plus excess air in fireplace and appliance flues or heat exchangers. FLUE LINER (LINING). A system or material used to form the inside surface of a flue in a chimney or vent, for the purpose of protecting the surrounding st ructure from the effects of combustion products and for conveying combustion products without leakage into the atmosphere. FUEL GAS. A natural gas, manufactured gas, liquefied petroleum gas or mixtures of these gases. FURNACE. A completely self - contained h eating unit that is designed to supply heated air to spaces remote from or adjacent to the appliance location. FURNACE, CENTRAL. A self - contained appliance for heating air by transfer of heat of combustion through metal to the air, and designed to supply h eated air through ducts to spaces remote from or adjacent to the appliance location. Forced - air type. A central furnace equipped with a fan or blower that provides the primary means for circulation of air. FURNACE PLENUM. An air compartment or chamber to which one or more ducts are connected and that forms part of an air distribution system. GAS CONVENIENCE OUTLET. A permanently mounted, manually operated device that provides the means for connecting an appliance to, and d isconnecting an appliance from, the supply piping. The device includes an integral, manually operated valve with a nondisplaceable valve member and is designed so that disconnection of an appliance only occurs when the manually operated valve is in the clo sed position. DEFINITIONS 2 - 8 2022 NEW YORK CITY FUEL GAS CODE GAS PIPING. An installation of pipe, valves or fittings installed on a premises or in a building and utilized to convey fuel gas. GAS UTILIZATION EQUIPMENT. An appliance that utilizes gas as a fuel or raw material or both. HAZARDOUS LOCATION. Any location considered to be a fire hazard for flammable vapors, dust, combustible fibers or other highly combustible substances. The location is not necessarily categorized in the New York City Building Code as a high - hazard group classification. HOUSE PIPING. See “Piping system.” HYDROGEN FUEL GAS ROOM. A separately ventilated, fully enclosed room designed to exclusively house the generation of gaseous hydrogen for immediate on - premises use in indoor fuel cells or other energy production process, and incidental indoor storage of gaseous hydrogen. A hydro gen fuel gas room is not intended to house the production or dispensing of hydrogen motor fuel. IGNITION SOURCE. A flame, spark or hot surface capable of igniting flammable vapors or fumes. Such sources include appliance burners, burner ignitors, and elect rical switching devices. INCINERATOR. An appliance used to reduce combustible refuse material to ashes and that is manufactured, sold and installed as a complete unit. INDUSTRIAL AIR HEATERS, NONRECIRCULATING DIRECT - FIRED . A heater in which all the product s of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating only outdoor air. INDUSTRIAL AIR HEATERS, RECIRCULATING DIRECT - FIRED . A heater in which all the pro ducts of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating outdoor air, and, if applicable, indoor air. INFRARED RADIANT HEATER. A heater that directs a s ubstantial amount of its energy output in the form of infrared radiant energy into the area to be heated. Such heaters are of either the vented or unvented type. INTEGRAL VENT APPLIANCES. Appliances designed for outdoor installation that have built - in natu ral or me- chanical venting means and are constructed and installed so that all air for combustion is derived from the outdoor atmosphere and all flue gases are discharged to the outdoor atmosphere through an integral vent termination. INTERLOCK. A device actuated by another device with which it is directly associated, to govern succeeding oper- ations of the same or allied devices. A circuit in which a given action cannot occur until after one or more other actions have taken place. JOINT, FLANGED. A joint made by bolting together a pair of flanged ends. JOINT, FLARED. A metal - to - metal compression joint in which a conical spread is made on the end of a tube that is compressed by a flare nut against a mating flare. JOINT, MECHANICAL. A general form o f gas - tight joints obtained by the joining of metal parts through a positive - holding mechanical construction, such as press joint, flanged joint, threaded joint, flared joint or compression joint. JOINT, PLASTIC ADHESIVE. A joint made in thermoset plastic piping by the use of an adhesive substance that forms a continuous bond between the mating surfaces without dissolving either one of them. JOINT, PLASTIC HEAT FUSION. A joint made in thermoplastic piping by heating the parts sufficiently to permit fusion o f the materials when the parts are pressed together. JOINT, WELDED. A gas - tight joint obtained by the joining of metal parts in molten state. LEAK CHECK. An operation performed on a gas piping system to verify that the system does not leak. Leakage checks are intended to discover open outlets, defective appliance connection and defects that have developed since the initial installation, normally performed after pressure testing. LIMIT CONTROL. A device responsive to changes in pressure, temperature or level for turning on, shutting off or throttling the gas supply to an appliance. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 9 LIQUEFIED PETROLEUM GAS or LPG (LP - GAS). Liquefied petroleum gas composed predominately of pro- pane, propylene, buta nes or butylenes, or mixtures thereof that is gaseous under normal atmospheric conditions, but is capable of being liquefied under moderate pressure at normal temperatures. LIVING SPACE. Space within a dwelling unit utilized for living, sleeping, eating, c ooking, bathing, washing and sanitation purposes. LOG LIGHTER. A manually operated solid fuel ignition appliance for installation in a vented solid fuel - burning fireplace. MAIN BURNER. A device or group of devices essentially forming an integral unit for t he final conveyance of gas or a mixture of gas and air to the combustion zone, and in which combustion takes place to accomplish the function for which the appliance is designed. METER. The instrument installed to measure the volume of gas delivered throug h it. NPS. An abbreviation for “Nominal pipe size.” NONCOMBUSTIBLE MATERIALS. Materials that, when tested in accordance with ASTM E 136, have at least three of four specimens tested meeting all of the following criteria: 1. The recorded temperature of the surface and interior thermocouples shall not at any time during the test rise more than 54ºF (12.2ºC) above the furnace temperature at the beginning of the test. 2. There shall not be flaming from the specimen after the first 30 seconds. 3. If the weight l oss of the specimen during testing exceeds 50 percent, the recorded temperature of the surface and interior thermocouples shall not at any time during the test rise above the furnace air temperature at the beginning of the test, and there shall not be flam ing of the specimen. OFFSET (VENT). A combination of approved bends that makes two changes in direction bringing one section of the vent out of line but into a line parallel with the other section. ORIFICE. The opening in a cap, spud or other device whereb y the flow of gas is limited and through which the gas is discharged to the burner. OUTLET. The point at which a gas - fired appliance connects to the gas piping system. OXYGEN DEPLETION SAFETY SHUTOFF SYSTEM (ODS). A system designed to act to shut off the g as sup- ply to the main and pilot burners if the oxygen in the surrounding atmosphere is reduced below a predetermined level. PILOT. A small flame that is utilized to ignite the gas at the main burner or burners. PIPING. Where used in this code, “piping” refers to either pipe or tubing, or both. Pipe. A rigid conduit of iron, steel, copper, brass or plastic. Tubing. Semirigid conduit of copper, aluminum, plastic or steel. PIPING SYSTEM. All fuel piping, valves and fitting s from the outlet of the point of delivery to the outlets of the appliance shutoff valves. PLASTIC, THERMOPLASTIC. A plastic that is capable of being repeatedly softened by increase of temperature and hardened by decrease of temperature. POINT OF DELIVERY. For natural gas systems, the point of delivery is the outlet of the service meter assembly or the outlet of the service regulator or service shutoff valve where a meter is not provided. Where a valve is provided at the outlet of the service meter assembly, such valve shall be considered to be downstream of the point of delivery. PORTABLE FUEL CELL APPLIANCE. A fuel cell generator of electricity, which is not fixed in place. A portable fuel cell appliance utilizes a cord and plug connection to a gr id - isolated load and has an integral fuel supply. PRESSURE DROP. The loss in pressure due to friction or obstruction in pipes, valves, fittings, regulators and burn- ers. DEFINITIONS 2 - 10 2022 NEW YORK CITY FUEL GAS CODE PRESSURE TEST. An operation performed to verify the gas - tight integrity of gas piping f ollowing its installation or modification. PURGE. To free a gas conduit of air or gas, or a mixture of gas and air. QUICK - DISCONNECT DEVICE. A hand - operated device that provides a means for connecting and disconnecting an appliance or an appliance connecto r to a gas supply and that is equipped with an automatic means to shut off the gas supply when the device is disconnected. READY ACCESS (TO). That which enables a device, fixture, appliance or equipment to be directly reached, without requiring the removal or movement of any panel, door or similar obstruction (see “Access (to) ”). REGULATOR. A device for controlling and maintaining a uniform supply pressure, either pounds - to - inches water column (MP regulator) or inches - to - inches water column (appliance regulator). REGULATOR, GAS APPLIANCE. A pressure regulator for controlling pressure to the manifold of the appliance. Types of appliance regulators are as follows: Adjustable. 1. Spring type, limited adjustment. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, the loading of which is adjus table over a range of not more than 15 percent of the outlet pressure at the midpoint of the adjustment range. 2. Spring type, standard adjustment. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, th e loading of which is adjustable. The adjustment means shall be con- cealed. Multistage. A regulator for use with a single gas whose adjustment means is capable of being positioned manually or automatically to two or more predetermined outlet pressure settin gs. Each of these settings shall be adjustable or nonadjustable. The regulator may modulate outlet pressures automatically between its maximum and minimum predetermined outlet pressure settings. Nonadjustable. 1. Spring type, nonadjustable. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, the loading of which is not field adjustable. 2. Weight type. A regulator in which the regulating force acting upon the diaphragm is derived from a weight or combina tion of weights. REGULATOR, LINE GAS PRESSURE. A device placed in a gas line between the service pressure regulator and the appliance for controlling, maintaining or reducing the pressure in that portion of the piping system downstream of the device. REGUL ATOR, MEDIUM - PRESSURE (MP Regulator). A line pressure regulator that reduces gas pressure from the range of greater than 0.5 psig (3.4 kPa) and less than or equal to 5 psig (34.5 kPa) to a lower pressure. REGULATOR, PRESSURE. A device placed in a gas line for reducing, controlling and maintaining the pressure in that portion of the piping system downstream of the device. REGULATOR, SERVICE PRESSURE. A device installed by the serving gas supplier to reduce and limit the ser- vice line pressure to delivery pres sure. RELIEF OPENING. The opening provided in a draft hood to permit the ready escape to the atmosphere of the flue products from the draft hood in the event of no draft, back draft or stoppage beyond the draft hood, and to permit air into the draft hood i n the event of a strong chimney updraft. RELIEF VALVE (DEVICE). A safety valve designed to forestall the development of a dangerous condition by relieving either pressure, temperature or vacuum . RELIEF VALVE, PRESSURE. An automatic valve that opens and clo ses a relief vent, depending on whether the pressure is above or below a predetermined value. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 11 RELIEF VALVE, TEMPERATURE. Manual reset type. A valve that automatically opens a relief vent at a predetermined temperature and that must be manually returned to the closed position. Reseating or self - closing type. An automatic valve that opens and closes a relief vent, depending on whether the temperature is above or below a predetermined value. RELIEF VALVE, VACUUM. A valve that automatically opens and closes a v ent for relieving a vacuum within the hot water supply system, depending on whether the vacuum is above or below a predetermined value. RISER, GAS. A vertical pipe supplying fuel gas that extends one full story or more . ROOM HEATER, UNVENTED. See “Unvented room heater.” ROOM HEATER, VENTED. See “Vented room heater. ” ROUGH - IN. Parts of the gas system that are installed prior to the installation of appliances or equipment. This in- cludes gas piping, all the necessary supports and any appliances that are built into the structure. SAFETY SHUTOFF DEVICE. See “Flame safeguard.” SERVI CE PIPING. All fuel - gas piping, valves and fittings upstream of the point of delivery. SHAFT. An enclosed space extending through one or more stories of a building, connecting vertical openings in successive floors, or floors and the roof. SLEEPING UNIT. A dwelling unit, which may contain either toilet or kitchen facilities but not both. Any sleeping unit housing more than one family shall also be classified as a congregate living unit. The creation of or conversion to sleeping units shall be limited by Sec tion 27 - 2077 of the New York City Housing Maintenance Code . SPECIFIC GRAVITY. As applied to gas, specific gravity is the ratio of the weight of a given volume to that of the same volume of air, both measured under the same condition. STATIONARY FUEL CELL P OWER PLANT. A self - contained package or factory - matched packages that con- stitute an automatically operated assembly of integrated systems for generating electrical energy and recoverable ther- mal energy that is permanently connected and fixed in place. THER MOSTAT. Electric switch type. A device that senses changes in temperature and controls electrically, by means of separate components, the flow of gas to the burner(s) to maintain selected temperatures. Integral gas valve type. An automatic device, actuated by temperature changes, desi gned to control the gas supply to the burner(s) in order to maintain temperatures between predetermined limits, and in which the thermal actuating element is an integral part of the device. 1. Graduating thermostat. A thermostat in which the motion of the valve is approximately in direct proportion to the effective motion of the thermal element induced by temperature change. 2. Snap - acting thermostat. A thermostat in which the thermostatic valve travels instantly from the closed to the open position, and vi ce versa. THIRD - PARTY CERTIFICATION AGENCY. An approved agency operating a product or material certification system that incorporates initial product testing, assessment and surveillance of a manufacturer’s quality control sys- tem. THIRD - PARTY CERTIFIED. Ce rtification obtained by the manufacturer indicating that the function and perfor- mance characteristics of a product or material have been determined by testing and ongoing surveillance by an ap- proved third - party certification agency. Assertion of certificat ion is in the form of identification in accordance with the requirements of the third - party certification agency. THIRD - PARTY TESTED. Procedure by which an approved testing laboratory provides documentation that a prod- uct, material or system conforms to sp ecified requirements. DEFINITIONS 2 - 12 2022 NEW YORK CITY FUEL GAS CODE TRANSITION FITTINGS, PLASTIC TO STEEL. An adapter for joining plastic pipe to steel pipe. The purpose of this fitting is to provide a permanent, pressure - tight connection between two materials that cannot be joined directly one to ano ther. UNIT HEATER .High - static pressure type. A self - contained, automatically controlled, vented appliance having integral means for circulation of air against 0.2 inch (15 mm H 2 O) or greater static pressure. Such appliance is equipped with provisions for attaching an outlet air duct and, where the appliance is for indoor installation remote from the space to be heated, is also equipped with provisions for attaching an inlet air duct. Low - static pressure type. A self - contained, automatically controlled, ven ted appliance, intended for installation in the space to be heated without the use of ducts, having integral means for circulation of air. Such units are allowed to be equipped with louvers or face extensions made in accordance with the manufacturer’s spec ifications. UNLISTED BOILER. A boiler not listed by a nationally recognized testing agency. UNVENTED ROOM HEATER. An unvented heating appliance designed for stationary installation and utilized to provide comfort heating. Such appliance provides radiant he at or convection heat by gravity or fan circulation directly from the heater and does not utilize ducts. VALVE. A device used in piping to control the gas supply to any section of a system of piping or to an appliance. Appliance shutoff. A valve located in the piping system, used to isolate individual appliances for purposes such as service or replacement. Automatic. An automatic or semiautomatic device consisting essentially of a valve and operator that control the gas supply to the burner(s) during operat ion of an appliance. The operator shall be actuated by application of gas pressure on a flexible diaphragm, by electrical means, by mechanical means, or by other approved means. Automatic gas shutoff. A valve used in conjunction with an automatic gas shuto ff device to shut off the gas supply to a system . It shall be constructed integrally with the gas shutoff device or shall be a separate assembly. Individual main burner. A valve that controls the gas supply to an individual main burner. Main burner control. A valve that controls the gas supply to the main burner manifold. Manual main gas - control. A manually operated valve in the gas line for the purpose of completely turning on or shutting off the gas supply to the appliance, except to pilot or pilots that are provided with independent shutoff. Manual reset. An automatic shutoff valve installed in the gas supply piping and set to shut off when unsafe con- ditions occur. The device remains closed until manually reopened. Service shutoff. A valve, installed by the serving gas supplier between the service meter or source of supply and the customer pipin g system, to shut off the entire piping system. VENT. A pipe or other conduit composed of factory - made components, containing a passageway for conveying com- bustion products and air to the atmosphere, listed and labeled for use with a specific type or class of appliance. Special gas vent. A vent listed and labeled for use with listed Category II, III and IV appliances. Type B vent. A vent listed and labeled for use with appliances with draft hoods and other Category I appliances that are listed for use with Type B vents. Type BW vent. A vent listed and labeled for use with wall furnaces. Type L vent. A vent listed and labeled for use with appliances that are listed for use with Type L or Type B vents. VENT CONNECTOR. See “Connector. ” VENT GASES. Products of c ombustion from appliances plus excess air plus dilution air in the vent connector, gas vent or chimney above the draft hood or draft regulator. VENT PIPING. DEFINITIONS 2022 NEW YORK CITY FUEL GAS CODE 2 - 13 Breather. Piping run from a pressure - regulating device to the outdoors, designed to provide a refer ence to atmos- pheric pressure. If the device incorporates an integral pressure relief mechanism, a breather vent can also serve as a relief vent. Relief. Piping run from a pressure - regulating or pressure - limiting device to the outdoors, designed to provide for the safe venting of gas in the event of excessive pressure in the gas piping system. VENTED APPLIANCE CATEGORIES. Appliances that are categorized for the purpose of vent selection are clas- sified into the following four categories: Category I. An applia nce that operates with a nonpositive vent static pressure and with a vent gas temperature that avoids excessive condensate production in the vent. Category II. An appliance that operates with a nonpositive vent static pressure and with a vent gas temperature that is capable of causing excessive condensate production in the vent. Category III. An appliance that operates with a positive vent static pressure and wi th a vent gas temperature that avoids excessive condensate production in the vent. Category IV. An appliance that operates with a positive vent static pressure and with a vent gas temperature that is capable of causing excessive condensate production in th e vent. VENTED ROOM HEATER. A vented self - contained, free - standing , nonrecessed appliance for furnishing warm air to the space in which it is installed, directly from the heater without duct connections. VENTED WALL FURNACE. A self - contained vented applian ce complete with grilles or equivalent, designed for incorporation in or permanent attachment to the structure of a building, mobile home or travel trailer, and furnishing heated air circulated by gravity or by a fan directly into the space to be heated th rough openings in the casing. This definition shall exclude floor furnaces, unit heaters and central furnaces as herein defined. VENTING SYSTEM. A continuous open passageway from the flue collar or draft hood of an appliance to the outdoor atmosphere for t he purpose of removing flue or vent gases. A venting system is usually composed of a vent or a chimney and vent connector, if used, assembled to form the open passageway. Forced - draft venting system. A portion of a venting system using a fan or other mecha nical means to cause the removal of flue or vent gases under positive static vent pressure. Induced draft venting system. A portion of a venting system using a fan or other mechanical means to cause the removal of flue or vent gases under nonpositive stati c vent pressure. Mechanical draft venting system. A venting system designed to remove flue or vent gases by mechanical means, that consists of an induced draft portion under nonpositive static pressure or a forced draft portion under positive static pressu re. Natural draft venting system. A venting system designed to remove flue or vent gases under nonpositive static vent pressure entirely by natural draft. WALL HEATER, UNVENTED - TYPE. A room heater of the type designed for insertion in or attachment to a wa ll or partition. Such heater does not incorporate concealed venting arrangements in its construction and discharges all products of combustion through the front into the room being heated. WATER HEATER. Any heating appliance or equipment that heats potable water and supplies such water to the potable hot water distribution system.