MAINE GAS EXAM QUESTIONS AND
ANSWERS WITH COMPLETE
SOLUTIONS 100% CORRECT RATED
A+ ||UPDATED 2026
What is the minimum vertical height required for a Type B-W gas vent
measured from the base of a wall furnace?
a. 8 feet
b. 10 feet
c. 12 feet ✔✔
d. 15 feet
Answer: c. 12 feet ✔✔
═════════════════════════════════════════════
What is the minimum required thickness for a steel shield plate (striker
barrier) used to protect gas piping from mechanical damage?
a. 0.0350"
b. 0.0508" ✔✔
c. 0.0625"
d. 0.1000"
Answer: b. 0.0508" ✔✔
═════════════════════════════════════════════
What maximum temperature must a clay flue liner be able to withstand
without cracking or structural failure?
a. 1,000°F
b. 1,500°F
c. 1,800°F ✔✔
d. 2,000°F
Answer: c. 1,800°F ✔✔
═════════════════════════════════════════════
When drawing combustion air from indoor spaces on the same story, what is
the minimum requirement for openings?
a. One permanent opening
b. Two permanent openings ✔✔
c. Three permanent openings
d. No openings required if doors are open
Answer: b. Two permanent 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"
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? -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?! -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
ANSWERS WITH COMPLETE
SOLUTIONS 100% CORRECT RATED
A+ ||UPDATED 2026
What is the minimum vertical height required for a Type B-W gas vent
measured from the base of a wall furnace?
a. 8 feet
b. 10 feet
c. 12 feet ✔✔
d. 15 feet
Answer: c. 12 feet ✔✔
═════════════════════════════════════════════
What is the minimum required thickness for a steel shield plate (striker
barrier) used to protect gas piping from mechanical damage?
a. 0.0350"
b. 0.0508" ✔✔
c. 0.0625"
d. 0.1000"
Answer: b. 0.0508" ✔✔
═════════════════════════════════════════════
What maximum temperature must a clay flue liner be able to withstand
without cracking or structural failure?
a. 1,000°F
b. 1,500°F
c. 1,800°F ✔✔
d. 2,000°F
Answer: c. 1,800°F ✔✔
═════════════════════════════════════════════
When drawing combustion air from indoor spaces on the same story, what is
the minimum requirement for openings?
a. One permanent opening
b. Two permanent openings ✔✔
c. Three permanent openings
d. No openings required if doors are open
Answer: b. Two permanent 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"
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? -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?! -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
