HVAC Gas Heat certification EXAM 2025
QUESTIONS AND ANSWERS
A gas furnace is to be installed in a garage. The national standards require that the burners and
ignition sources must be located ______ above the floor - ANS 18 inches
A good description of how a bi-metal fan switch operates the blower motor on a gas furnace is -
ANS Temperature on- temperature off
Redundant gas valves used on gas furnaces have - ANS Dual gas shut off seats
Burning one cubic foot of liquefied petroleum gas completely will produce approximately
______ BTUs - ANS 2000 - 2500
LP gas has a specific gravity of - ANS 1.5 - 2.0
What is the purpose of a spoiler screw located on a burner, or adjustable-shutters? -
ANS Mix primary air and gas
Furnace limit switches are wired in series with the - ANS Gas valve
A technician is using an extension ladder to work on roof top unit. The top of the ladder should
extend _____ beyond the support point - ANS 3 feet
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, A technician determines that a natural gas furnace has a defective heat exchanger. The
technician should - ANS Inform the homeowner and turn the gas off
A natural gas furnace usually requires _____ gas pressure at the manifold and burners -
ANS 3.5 in. W.C.
The vent system for a condensing furnace is classified as ____ by the National Field Gas Code. -
ANS Category IV
Type B vent pipe must be kept at least _____ from combustible materials - ANS One inch
Typical condensing furnaces have an AFUE rating of at least - ANS 90%
You have installed a Category IV two-pipe vent system that terminates through the roof of the
residence. The elbow for the combustion air intake, above the roof, should - ANS Point it
down
The reason heating thermostat have anticipated is to - ANS Reduce lag
The typical flue gas temperature of a Category III furnace is - ANS 280°F - 300°F
Natural gas primary consists of - ANS Methane
Burning one cubic foot of natural gas will produce approximately _____ BTU's -
ANS 900~1,100
A furnace nameplate specifies a temperature rise of 40 to 70 degrees. Temperature
measurements indicate a rise of 80 degrees. The most appropriate action is to - ANS Increase
2
fan speed
Page
@COPYRIGHT BRAINBARTER 2025/2026
QUESTIONS AND ANSWERS
A gas furnace is to be installed in a garage. The national standards require that the burners and
ignition sources must be located ______ above the floor - ANS 18 inches
A good description of how a bi-metal fan switch operates the blower motor on a gas furnace is -
ANS Temperature on- temperature off
Redundant gas valves used on gas furnaces have - ANS Dual gas shut off seats
Burning one cubic foot of liquefied petroleum gas completely will produce approximately
______ BTUs - ANS 2000 - 2500
LP gas has a specific gravity of - ANS 1.5 - 2.0
What is the purpose of a spoiler screw located on a burner, or adjustable-shutters? -
ANS Mix primary air and gas
Furnace limit switches are wired in series with the - ANS Gas valve
A technician is using an extension ladder to work on roof top unit. The top of the ladder should
extend _____ beyond the support point - ANS 3 feet
1
Page
@COPYRIGHT BRAINBARTER 2025/2026
, A technician determines that a natural gas furnace has a defective heat exchanger. The
technician should - ANS Inform the homeowner and turn the gas off
A natural gas furnace usually requires _____ gas pressure at the manifold and burners -
ANS 3.5 in. W.C.
The vent system for a condensing furnace is classified as ____ by the National Field Gas Code. -
ANS Category IV
Type B vent pipe must be kept at least _____ from combustible materials - ANS One inch
Typical condensing furnaces have an AFUE rating of at least - ANS 90%
You have installed a Category IV two-pipe vent system that terminates through the roof of the
residence. The elbow for the combustion air intake, above the roof, should - ANS Point it
down
The reason heating thermostat have anticipated is to - ANS Reduce lag
The typical flue gas temperature of a Category III furnace is - ANS 280°F - 300°F
Natural gas primary consists of - ANS Methane
Burning one cubic foot of natural gas will produce approximately _____ BTU's -
ANS 900~1,100
A furnace nameplate specifies a temperature rise of 40 to 70 degrees. Temperature
measurements indicate a rise of 80 degrees. The most appropriate action is to - ANS Increase
2
fan speed
Page
@COPYRIGHT BRAINBARTER 2025/2026
