Maine Gas Final Exam Questions with
Guaranteed Pass Solutions Graded A+
2025\2026 Version.
Minimum vertical height for a Type B-W gas vent above the bottom of a wall furnace? - Answer
12 Feet
Minimum thickness of a steel striker barrier for gas tubing protection? - Answer 0.0508"
What is the maximum temp that a clay flue liner must be able to withstand without cracking? -
Answer 1,800 degrees F
Combustion air obtained from indoors on the same story shall have a minimum of... - 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? - Answer 50 feet
What reference standard covers the storage of liquid propane gas? - Answer 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
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? - Answer 1 "
Maximum distance a gas shut-off valve can be installed from the equipment it serves? - Answer
6 feet
Maximum distance off the ceiling of the room shall an indoor combustion air opening be
installed? - Answer 12"
What is the minimum required clearance for an unlisted pool heater on all sides and rear? -
Answer 12"
, 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?! -
Answer Anhydrous Citric Acid
When a mechanical appliance is installed in an excavation deeper than 12", what shall the
excavation be lined with? - 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? - 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? - Answer 10%
What is the minimum test pressure that can be used for testing newly installed gas piping? -
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? - 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? - Answer 6"
What is the maximum btu/hr input for an unlisted decorative appliance installed in a vented
fireplace with an 18 foot tall chimney and permanent free opening area of 29 in.²? - Answer
50,400 BTU
All of the following piping materials are approved to be used for gas piping except... - Answer
Cast Iron
What is the minimum size dimension of outdoor combustion air openings? - Answer 3"
What is the maximum operating pressure for a low pressure steam boiler? - Answer 15 psi
What is the maximum distance between horizontal supports for half inch OD copper tubing
Guaranteed Pass Solutions Graded A+
2025\2026 Version.
Minimum vertical height for a Type B-W gas vent above the bottom of a wall furnace? - Answer
12 Feet
Minimum thickness of a steel striker barrier for gas tubing protection? - Answer 0.0508"
What is the maximum temp that a clay flue liner must be able to withstand without cracking? -
Answer 1,800 degrees F
Combustion air obtained from indoors on the same story shall have a minimum of... - 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? - Answer 50 feet
What reference standard covers the storage of liquid propane gas? - Answer 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
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? - Answer 1 "
Maximum distance a gas shut-off valve can be installed from the equipment it serves? - Answer
6 feet
Maximum distance off the ceiling of the room shall an indoor combustion air opening be
installed? - Answer 12"
What is the minimum required clearance for an unlisted pool heater on all sides and rear? -
Answer 12"
, 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?! -
Answer Anhydrous Citric Acid
When a mechanical appliance is installed in an excavation deeper than 12", what shall the
excavation be lined with? - 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? - 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? - Answer 10%
What is the minimum test pressure that can be used for testing newly installed gas piping? -
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? - 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? - Answer 6"
What is the maximum btu/hr input for an unlisted decorative appliance installed in a vented
fireplace with an 18 foot tall chimney and permanent free opening area of 29 in.²? - Answer
50,400 BTU
All of the following piping materials are approved to be used for gas piping except... - Answer
Cast Iron
What is the minimum size dimension of outdoor combustion air openings? - Answer 3"
What is the maximum operating pressure for a low pressure steam boiler? - Answer 15 psi
What is the maximum distance between horizontal supports for half inch OD copper tubing
