INTERNATIONAL FUEL GAS CODE (2021 IFGC)
QUESTIONS AND CORRECT ANSWERS THE
LATEST 2025-2026 UPDATE
Atmospheric Pressure
(Section 202 General definitions) - Answer-The pressure of the weight
of air and water vapor on the surface of the earth, approximately 14.7
pounds per square inch at sea level.
Boiler, Low-Pressure
(Section 202 General definitions) - Answer-A self-contained appliance
for supplying steam or hot water.
BTU
(Section 202 General definitions) - Answer-Abbreviation for British
thermal unit, which is the quantity of heat required to raise the
temperature of 1 pound of water to 1°F.
Combustible Assembly
,(Section 202 General definitions) - Answer-Wall, floor, ceiling or other
assembly constructed of one or more component materials that are not
defined as noncombustible.
Combustion Air
(Section 202 General definitions.) - Answer-Air necessary for complete
combustion of a fuel, including theoretical air and excess air.
Concealed Location
(Section 202 General definitions) - Answer-A location that cannot be
accessed without damaging permanent parts of the building structure or
finish surface.
Cubic Foot
(Section 202 General definitions.) - Answer-The amount of gas that
occupies 1 cubic foot when at temperature of 60°F saturated with water
vapor and under a pressure equivalent to that of 30 inches of mercury.
Demand
,(Section 202 General definitions.) - Answer-The maximum amount of
gas input required per unit of time, usually expressed in cubic feet per
hour, or Btu/h (1 Btu/h = 0.2931 W)
Dilution Air
(Section 202 General definitions.) - Answer-Air that is introduced into a
draft hood and is mixed with the flue gases.
Draft
(Section 202 General definitions.) - Answer-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 through the gas passages of the appliance to the atmosphere.
Excess Flow Valve
(Section 202 General definitions.) - Answer-A valve designed to activate
when the fuel gas passing through it exceeds a prescribed flow rate.
Furnace, Central
(Section 202 General definitions.) - Answer-A completely self-contained
appliance for heating air by transfer of heat of combustion through metal
, to the air, and designed to supply heated air through ducts to spaces
remote or adjacent to the appliance location.
Furnace Plenum
(Section 202 General definitions.) - Answer-An air compartment or
chamber to which one or more ducts are connected and that forms part
of an air distribution.
Gas Piping
(Section 202 General definitions.) - Answer-An installation of pipe,
valves or fitting installed on a premises or in a building and utilized to
convey fuel gas.
Hazardous Location
(Section 202 General definitions.) - Answer-Any location considered to
be a fire hazard for flammable vapors, dust, combustible fibers or other
highly combustible substances.
Joint, Flared
(Section 202 General definitions.) - Answer-A metal-to-metal
compression join in which a conical spread is made on the end of a tube
that is compressed by a flare nut against a mating flare.
QUESTIONS AND CORRECT ANSWERS THE
LATEST 2025-2026 UPDATE
Atmospheric Pressure
(Section 202 General definitions) - Answer-The pressure of the weight
of air and water vapor on the surface of the earth, approximately 14.7
pounds per square inch at sea level.
Boiler, Low-Pressure
(Section 202 General definitions) - Answer-A self-contained appliance
for supplying steam or hot water.
BTU
(Section 202 General definitions) - Answer-Abbreviation for British
thermal unit, which is the quantity of heat required to raise the
temperature of 1 pound of water to 1°F.
Combustible Assembly
,(Section 202 General definitions) - Answer-Wall, floor, ceiling or other
assembly constructed of one or more component materials that are not
defined as noncombustible.
Combustion Air
(Section 202 General definitions.) - Answer-Air necessary for complete
combustion of a fuel, including theoretical air and excess air.
Concealed Location
(Section 202 General definitions) - Answer-A location that cannot be
accessed without damaging permanent parts of the building structure or
finish surface.
Cubic Foot
(Section 202 General definitions.) - Answer-The amount of gas that
occupies 1 cubic foot when at temperature of 60°F saturated with water
vapor and under a pressure equivalent to that of 30 inches of mercury.
Demand
,(Section 202 General definitions.) - Answer-The maximum amount of
gas input required per unit of time, usually expressed in cubic feet per
hour, or Btu/h (1 Btu/h = 0.2931 W)
Dilution Air
(Section 202 General definitions.) - Answer-Air that is introduced into a
draft hood and is mixed with the flue gases.
Draft
(Section 202 General definitions.) - Answer-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 through the gas passages of the appliance to the atmosphere.
Excess Flow Valve
(Section 202 General definitions.) - Answer-A valve designed to activate
when the fuel gas passing through it exceeds a prescribed flow rate.
Furnace, Central
(Section 202 General definitions.) - Answer-A completely self-contained
appliance for heating air by transfer of heat of combustion through metal
, to the air, and designed to supply heated air through ducts to spaces
remote or adjacent to the appliance location.
Furnace Plenum
(Section 202 General definitions.) - Answer-An air compartment or
chamber to which one or more ducts are connected and that forms part
of an air distribution.
Gas Piping
(Section 202 General definitions.) - Answer-An installation of pipe,
valves or fitting installed on a premises or in a building and utilized to
convey fuel gas.
Hazardous Location
(Section 202 General definitions.) - Answer-Any location considered to
be a fire hazard for flammable vapors, dust, combustible fibers or other
highly combustible substances.
Joint, Flared
(Section 202 General definitions.) - Answer-A metal-to-metal
compression join in which a conical spread is made on the end of a tube
that is compressed by a flare nut against a mating flare.
