GAS HEAT ESCO EXAM QUESTIONS
AND ANSWERS GRADED A+ 2026
A gas furnace to be installed in a garage. The national standards requires that the burners and
ignition 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 will shut down if gas pressure exceeds: - ANS 13.5
in W.C. (or 1/2 psi)
This is the maximum pressure for gas valve operation
Burning one cubic foot of Liquefied Petroleum gas completely will produce approximately ____
BTUs. - ANS 2,000 - 2,500
LP gas has a specific gravity of ...? - ANS 1.5 - 2.0 ( actual is 1.5 heavier than air which is 1.0)
What is the purpose of a spoiler screw located on a burner, or adjustable-shutters? - ANS to
mix primary air and gas
Furnace limit switches are wired in series with the: - ANS Gas valve
@COPYRIGHT 2026/2027 ALL RIGHTS RESERVED
1
, 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
A technician determines that a natural gas furnace has a defective heat exchanger. The
technician should: - ANS Inform the home owner and turn the gas off.
A natural gas furnace usually requires _____ gas pressure AT the manifold and burners.
What should the inlet pressure be to the manifold? - ANS 3.5 in WC
inlet- 5-7 in WC
The vent system for a condensing furnace is classified as ___ by the National Field Gas Code. -
ANS Category IV (4)
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
down
The reason heating thermostats have anticipators is to: - ANS reduce overshoot
The typical fluw gas temperature of a Category III furnace is: - ANS 280 F - 300 F
The proper chemical name for natural gas is: - ANS Methane
Burning one cubic foot of natural gas will produce approximately ___ BTU's. - ANS 900-1100
@COPYRIGHT 2026/2027 ALL RIGHTS RESERVED
2
AND ANSWERS GRADED A+ 2026
A gas furnace to be installed in a garage. The national standards requires that the burners and
ignition 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 will shut down if gas pressure exceeds: - ANS 13.5
in W.C. (or 1/2 psi)
This is the maximum pressure for gas valve operation
Burning one cubic foot of Liquefied Petroleum gas completely will produce approximately ____
BTUs. - ANS 2,000 - 2,500
LP gas has a specific gravity of ...? - ANS 1.5 - 2.0 ( actual is 1.5 heavier than air which is 1.0)
What is the purpose of a spoiler screw located on a burner, or adjustable-shutters? - ANS to
mix primary air and gas
Furnace limit switches are wired in series with the: - ANS Gas valve
@COPYRIGHT 2026/2027 ALL RIGHTS RESERVED
1
, 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
A technician determines that a natural gas furnace has a defective heat exchanger. The
technician should: - ANS Inform the home owner and turn the gas off.
A natural gas furnace usually requires _____ gas pressure AT the manifold and burners.
What should the inlet pressure be to the manifold? - ANS 3.5 in WC
inlet- 5-7 in WC
The vent system for a condensing furnace is classified as ___ by the National Field Gas Code. -
ANS Category IV (4)
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
down
The reason heating thermostats have anticipators is to: - ANS reduce overshoot
The typical fluw gas temperature of a Category III furnace is: - ANS 280 F - 300 F
The proper chemical name for natural gas is: - ANS Methane
Burning one cubic foot of natural gas will produce approximately ___ BTU's. - ANS 900-1100
@COPYRIGHT 2026/2027 ALL RIGHTS RESERVED
2
