MAINE GAS EXAM QUESTIONS AND
CORRECT ANSWERS. VERIFIED
2025/2026.
Minimum vertical height for a Type B-W gas vent above the bottom of a wall furnace? -
ANS 12 Feet
Minimum thickness of a steel striker barrier for gas tubing protection? - ANS 0.0508"
What is the maximum temp that a clay flue liner must be able to withstand without cracking? -
ANS 1,800 degrees F
Combustion air obtained from indoors on the same story shall have a minimum of... -
ANS Two openings
When gas is being supplied by a manifold located in a remote area, what is the maximum
distance the shutoff valve at the manifold can be located from the appliance? - ANS 50 feet
What reference standard covers the storage of liquid propane gas? - ANS NFPA 58
A service station is being built with one boiler 28 feet away from the meter that uses natural
gas; all other equipment is electric. What size K or L semi-rigid copper tubing should be installed
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, to supply 205 cu. ft. of gas per hour with an inlet pressure less than 2 psi, pressure drop of 0.3
in. W.C. and a specific gravity of 0.60? - ANS 1"
Maximum distance a gas shut-off valve can be installed from the equipment it serves? -
ANS 6 feet
Maximum distance off the ceiling of the room shall an indoor combustion air opening be
installed? - ANS 12"
What is the minimum required clearance for an unlisted pool heater on all sides and rear? -
ANS 12"
Flanges used for gas piping shall have gaskets made of an approved material designed to
withstand temperatures, pressure and chemical constituents of the gas. Which of the following
gasket materials is not acceptable? - ANS Rubber
When corrosive or flammable fumes or gases are present near appliances, a safe disposal
method shall be provided. All of the following are considered flammable or corrosive EXCEPT?! -
ANS Anhydrous Citric Acid
When a mechanical appliance is installed in an excavation deeper than 12", what shall the
excavation be lined with? - ANS Copper pan
Which type of regulator is used in series with an another pressure regulator for the purpose of
automatically taking over in an emergency the control of the pressure down stream in case the
pressure tends to exceed a set maximum? - ANS Monitoring
When more than 2 90° elbow's are required in a vent connector, the maximum capacity of the
connector shall be reduced for each additional 90° elbow by? - ANS 10%
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
CORRECT ANSWERS. VERIFIED
2025/2026.
Minimum vertical height for a Type B-W gas vent above the bottom of a wall furnace? -
ANS 12 Feet
Minimum thickness of a steel striker barrier for gas tubing protection? - ANS 0.0508"
What is the maximum temp that a clay flue liner must be able to withstand without cracking? -
ANS 1,800 degrees F
Combustion air obtained from indoors on the same story shall have a minimum of... -
ANS Two openings
When gas is being supplied by a manifold located in a remote area, what is the maximum
distance the shutoff valve at the manifold can be located from the appliance? - ANS 50 feet
What reference standard covers the storage of liquid propane gas? - ANS NFPA 58
A service station is being built with one boiler 28 feet away from the meter that uses natural
gas; all other equipment is electric. What size K or L semi-rigid copper tubing should be installed
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, to supply 205 cu. ft. of gas per hour with an inlet pressure less than 2 psi, pressure drop of 0.3
in. W.C. and a specific gravity of 0.60? - ANS 1"
Maximum distance a gas shut-off valve can be installed from the equipment it serves? -
ANS 6 feet
Maximum distance off the ceiling of the room shall an indoor combustion air opening be
installed? - ANS 12"
What is the minimum required clearance for an unlisted pool heater on all sides and rear? -
ANS 12"
Flanges used for gas piping shall have gaskets made of an approved material designed to
withstand temperatures, pressure and chemical constituents of the gas. Which of the following
gasket materials is not acceptable? - ANS Rubber
When corrosive or flammable fumes or gases are present near appliances, a safe disposal
method shall be provided. All of the following are considered flammable or corrosive EXCEPT?! -
ANS Anhydrous Citric Acid
When a mechanical appliance is installed in an excavation deeper than 12", what shall the
excavation be lined with? - ANS Copper pan
Which type of regulator is used in series with an another pressure regulator for the purpose of
automatically taking over in an emergency the control of the pressure down stream in case the
pressure tends to exceed a set maximum? - ANS Monitoring
When more than 2 90° elbow's are required in a vent connector, the maximum capacity of the
connector shall be reduced for each additional 90° elbow by? - ANS 10%
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
