G2 Exam with Correct Answers 2025/2026
Rated A+
Relative humidity is defined as? - CORRECT ANSWER -The percentage of moisture that the
quantity of air is holding in relation to how much it can hold
A certified hose can be used to connect a construction heater to a gas piping system for
temporary use when? - CORRECT ANSWER -When 1/4 turn level type shut off is installed
upstream of the hose
What is the minimum amount of insulation required behind the vapour barrier? - CORRECT
ANSWER -2/3
The vent connector and common vent of a water heater and furnace are tied together with a
"Y" fitting before entering the chimney. Note the information below and answer the question
that follows.
Chimney - H= 25'
Furnace - 100,000 Btuh
Single wall vent
Mid-efficiency with induced draft blower
Water Heater - 45,000 Btuh
Single wall vent
Draft diverter
Home - 25 years old
, No sealed vapour barrier
Has range hood, bathroom fan and fireplace
Volume =4,000 cubic feet
What is the maximum lateral length of the common vent lateral?
Incorrect Response
6 feet - CORRECT ANSWER -9 feet
Fan assist burners will: - CORRECT ANSWER -Overcome the resistance of the burner only
When twinning two domestic water heaters: - CORRECT ANSWER -The supply and discharge
piping must be identical in length and resistance
Which type of venting system may be used on a fireplace insert? - CORRECT ANSWER -Certified
chimney liner
A low gas pressure switch must interrupt the flow of gas when? - CORRECT ANSWER -When the
pressure drops more than 50% of the proper supply pressure
What is the effect on the refrigeration cycle, when the flame on a gas fired refrigerator is at the
lowest or minimum setting? - CORRECT ANSWER -No refrigeration affect
What is the minimum distance above grade level a dryer vent can terminate? - CORRECT
ANSWER -12"
What is the preferred material for moisture exhaust duct for a gas dryer? - CORRECT ANSWER -
Rigid metal
Rated A+
Relative humidity is defined as? - CORRECT ANSWER -The percentage of moisture that the
quantity of air is holding in relation to how much it can hold
A certified hose can be used to connect a construction heater to a gas piping system for
temporary use when? - CORRECT ANSWER -When 1/4 turn level type shut off is installed
upstream of the hose
What is the minimum amount of insulation required behind the vapour barrier? - CORRECT
ANSWER -2/3
The vent connector and common vent of a water heater and furnace are tied together with a
"Y" fitting before entering the chimney. Note the information below and answer the question
that follows.
Chimney - H= 25'
Furnace - 100,000 Btuh
Single wall vent
Mid-efficiency with induced draft blower
Water Heater - 45,000 Btuh
Single wall vent
Draft diverter
Home - 25 years old
, No sealed vapour barrier
Has range hood, bathroom fan and fireplace
Volume =4,000 cubic feet
What is the maximum lateral length of the common vent lateral?
Incorrect Response
6 feet - CORRECT ANSWER -9 feet
Fan assist burners will: - CORRECT ANSWER -Overcome the resistance of the burner only
When twinning two domestic water heaters: - CORRECT ANSWER -The supply and discharge
piping must be identical in length and resistance
Which type of venting system may be used on a fireplace insert? - CORRECT ANSWER -Certified
chimney liner
A low gas pressure switch must interrupt the flow of gas when? - CORRECT ANSWER -When the
pressure drops more than 50% of the proper supply pressure
What is the effect on the refrigeration cycle, when the flame on a gas fired refrigerator is at the
lowest or minimum setting? - CORRECT ANSWER -No refrigeration affect
What is the minimum distance above grade level a dryer vent can terminate? - CORRECT
ANSWER -12"
What is the preferred material for moisture exhaust duct for a gas dryer? - CORRECT ANSWER -
Rigid metal
