GAS FITTER EXAM BUNDLED 2026
COMPREHENSIVE EXAM PACK VERIFIED
QUESTIONS AND ANSWERS WELL
ILLUSTRATED A+
◉ What type of vent must be used when the vent of a wall furnace will
be concealed in a partition wall?
A. B vent
B. L vent
C. BH vent
D. BW vent. Answer: D
◉ Single wall vent connectors:
A. may pass through floors, ceilings or roofs provided a metal thimble is
used
B. may pass through floors, ceilings or roofs provided the required
minimum distance from combustible material is maintained
C. may pass through floors, ceilings or roofs provided they are insulated
D. shall not pass through floors, ceilings or roofs. Answer: D
◉ BW vent shall be used only with an approved:
A. decorative appliance
B. down flow furnace
,C. revertible flue boiler
D. recessed wall furnace. Answer: D
◉ What must be done during the installation of a gas log fireplace?
A. Make sure there is a metal mesh screen in front of the fireplace
B. Secure the chimney damper in the open position
C. Install a pressure regulator
D. Install a metal chimney liner. Answer: B
◉ When can a certified hose be used to connect a construction heater to
temporary piping?
A. Only if a lever handle shut off valve is installed upstream of the hose
B. Only if the hose is 15 feet long
C. Never. Answer: A
◉ Which of the following is acceptable when a fireplace insert is
installed?
A. A metal chimney linear
B. The existing fireplace flue
C. BW vent
D. A tile lined fireplace flue?. Answer: A
,◉ An unvented infra-red heater can be installed in ________ application
A. A warehouse
B. A commercial building
C. An industrial building
D. All of the above. Answer: D
◉ Dirt pockets are required on:
A. Decorative appliances
B. Gas logs
C. Room heaters
D. None of the available choices. Answer: D
◉ What diameter and length of a dirt pocket is required when a drop line
is 3-inch diameter?
A. 3 inch diameter by 3 inches long
B. 1 inch diameter by 3 inches long
C. 3/4 inch diameter by 3 inches long
D. 2 inch diameter by 3 inches long. Answer: D
◉ What type of room heater maybe installed in a bathroom?
A. Natural draft
B. Direct fired
, C. Forced draft
D. Direct vent. Answer: D
◉ What safety control protects a steam boiler if the condensate pump
fails to return water to the boiler?
A. High pressure limit control
B. Low pressure limit control
C. Flame safeguard control
D. Low water cut off. Answer: D
◉ The relief valve for a residential low-pressure hot water boiler system
should be?
A. 14.7 psia
B. 15 psia
C. 30 psig
D. 30 psia. Answer: C
◉ A backflow prevent used in a boiler system should be located in the:
A. Over flow line connected to the drain
B. Return line close to the boiler
C. 1/4" line connecting the boiler and cushion tank
D. Make up water line to the system. Answer: B
COMPREHENSIVE EXAM PACK VERIFIED
QUESTIONS AND ANSWERS WELL
ILLUSTRATED A+
◉ What type of vent must be used when the vent of a wall furnace will
be concealed in a partition wall?
A. B vent
B. L vent
C. BH vent
D. BW vent. Answer: D
◉ Single wall vent connectors:
A. may pass through floors, ceilings or roofs provided a metal thimble is
used
B. may pass through floors, ceilings or roofs provided the required
minimum distance from combustible material is maintained
C. may pass through floors, ceilings or roofs provided they are insulated
D. shall not pass through floors, ceilings or roofs. Answer: D
◉ BW vent shall be used only with an approved:
A. decorative appliance
B. down flow furnace
,C. revertible flue boiler
D. recessed wall furnace. Answer: D
◉ What must be done during the installation of a gas log fireplace?
A. Make sure there is a metal mesh screen in front of the fireplace
B. Secure the chimney damper in the open position
C. Install a pressure regulator
D. Install a metal chimney liner. Answer: B
◉ When can a certified hose be used to connect a construction heater to
temporary piping?
A. Only if a lever handle shut off valve is installed upstream of the hose
B. Only if the hose is 15 feet long
C. Never. Answer: A
◉ Which of the following is acceptable when a fireplace insert is
installed?
A. A metal chimney linear
B. The existing fireplace flue
C. BW vent
D. A tile lined fireplace flue?. Answer: A
,◉ An unvented infra-red heater can be installed in ________ application
A. A warehouse
B. A commercial building
C. An industrial building
D. All of the above. Answer: D
◉ Dirt pockets are required on:
A. Decorative appliances
B. Gas logs
C. Room heaters
D. None of the available choices. Answer: D
◉ What diameter and length of a dirt pocket is required when a drop line
is 3-inch diameter?
A. 3 inch diameter by 3 inches long
B. 1 inch diameter by 3 inches long
C. 3/4 inch diameter by 3 inches long
D. 2 inch diameter by 3 inches long. Answer: D
◉ What type of room heater maybe installed in a bathroom?
A. Natural draft
B. Direct fired
, C. Forced draft
D. Direct vent. Answer: D
◉ What safety control protects a steam boiler if the condensate pump
fails to return water to the boiler?
A. High pressure limit control
B. Low pressure limit control
C. Flame safeguard control
D. Low water cut off. Answer: D
◉ The relief valve for a residential low-pressure hot water boiler system
should be?
A. 14.7 psia
B. 15 psia
C. 30 psig
D. 30 psia. Answer: C
◉ A backflow prevent used in a boiler system should be located in the:
A. Over flow line connected to the drain
B. Return line close to the boiler
C. 1/4" line connecting the boiler and cushion tank
D. Make up water line to the system. Answer: B
