Maine Gas Exam 2026 Questions and
Answers
Minimum vertical height for a Type B-W gas vent above the bottom of a wall
furnace? - Correct answer-12 Feet
Minimum thickness of a steel striker barrier for gas tubing protection? - Correct
answer-0.0508"
What is the maximum temp that a clay flue liner must be able to withstand without
cracking? - Correct answer-1,800 degrees F
Combustion air obtained from indoors on the same story shall have a minimum
of... - Correct answer-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? - Correct answer-50 feet
What reference standard covers the storage of liquid propane gas? - Correct
answer-NFPA 58
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,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 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? - Correct answer-1 "
Maximum distance a gas shut-off valve can be installed from the equipment it
serves? - Correct answer-6 feet
Maximum distance off the ceiling of the room shall an indoor combustion air
opening be installed? - Correct answer-12"
What is the minimum required clearance for an unlisted pool heater on all sides
and rear? - Correct answer-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? - Correct answer-
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?! - Correct answer-Anhydrous Citric Acid
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
, When a mechanical appliance is installed in an excavation deeper than 12", what
shall the excavation be lined with? - Correct answer-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? - Correct
answer-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? -
Correct answer-10%
What is the minimum test pressure that can be used for testing newly installed gas
piping? - Correct answer-3 psig
What is the minimum vertical distance to the bottom of a combustion air intake
located on the exterior of a building above adjacent finish ground level? - Correct
answer-12"
A residential boiler or furnace with a listed gas conversion burner and draft hood
with a type B gas vent shall have a minimum clearance from combustible materials
of? - Correct answer-6"
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
Answers
Minimum vertical height for a Type B-W gas vent above the bottom of a wall
furnace? - Correct answer-12 Feet
Minimum thickness of a steel striker barrier for gas tubing protection? - Correct
answer-0.0508"
What is the maximum temp that a clay flue liner must be able to withstand without
cracking? - Correct answer-1,800 degrees F
Combustion air obtained from indoors on the same story shall have a minimum
of... - Correct answer-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? - Correct answer-50 feet
What reference standard covers the storage of liquid propane gas? - Correct
answer-NFPA 58
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,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 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? - Correct answer-1 "
Maximum distance a gas shut-off valve can be installed from the equipment it
serves? - Correct answer-6 feet
Maximum distance off the ceiling of the room shall an indoor combustion air
opening be installed? - Correct answer-12"
What is the minimum required clearance for an unlisted pool heater on all sides
and rear? - Correct answer-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? - Correct answer-
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?! - Correct answer-Anhydrous Citric Acid
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
, When a mechanical appliance is installed in an excavation deeper than 12", what
shall the excavation be lined with? - Correct answer-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? - Correct
answer-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? -
Correct answer-10%
What is the minimum test pressure that can be used for testing newly installed gas
piping? - Correct answer-3 psig
What is the minimum vertical distance to the bottom of a combustion air intake
located on the exterior of a building above adjacent finish ground level? - Correct
answer-12"
A residential boiler or furnace with a listed gas conversion burner and draft hood
with a type B gas vent shall have a minimum clearance from combustible materials
of? - Correct answer-6"
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
