G2 Gas Technician Module 19 Revised
Exam 2026 Questions and Answers
If the venting on a high efficiency furnace runs through unheated spaces, what
must be done? - Correct Answer -Insulate piping to prevent Condensation and
freezing
What is condensate drain piping used for? - Correct Answer -Dispose Liquid waste
Once the furnace is installed, what are the gas technician's responsibilities to the
user? - Correct Answer -To instruct the the user in the safe and correct operation of
all appliances and equipment - clause 4.3.2
Which furnace type is the most popular? - Correct Answer -High boy Up Flow
What type of furnace is used in areas of limited head room? - Correct Answer -
Horizontal Forced Air
What is the AFUE rating of a typical medium efficiency furnace? - Correct Answer
-78% - 82%
Which category of furnace is standard atmospheric appliance? - Correct Answer -
Category 1
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, Is a fan necessary to move the flue gases through a gravity vent? Why? - Correct
Answer -No, hot air rises.
Are high-efficiency furnaces power vented? - Correct Answer -Yes
Which Vent is the most heat resistant? - Correct Answer -Type A
On a forced draft burner, where is the fan located? - Correct Answer -Upstream
from the combustion chamber.
What is the disadvantage of oversizing a furnace? - Correct Answer -Inefficiency
How is the delivered air volume adjusted if a belt-drive fan motor is being used? -
Correct Answer -Adjusting the pulleys of the motor
Must all defective heat exchangers be replaced immediately? - Correct Answer -
Yes
A high efficiency furnace incorporates how many heat exchangers? - Correct
Answer -Two
On a furnace with no filter rack, what should be done? - Correct Answer -Rack
should be built on return duct connection
What is a plenum? - Correct Answer -Duct work system connected directly to the
furnace
©COPYRIGHT 2025 ALL RIGHTS RESERVED 2
Exam 2026 Questions and Answers
If the venting on a high efficiency furnace runs through unheated spaces, what
must be done? - Correct Answer -Insulate piping to prevent Condensation and
freezing
What is condensate drain piping used for? - Correct Answer -Dispose Liquid waste
Once the furnace is installed, what are the gas technician's responsibilities to the
user? - Correct Answer -To instruct the the user in the safe and correct operation of
all appliances and equipment - clause 4.3.2
Which furnace type is the most popular? - Correct Answer -High boy Up Flow
What type of furnace is used in areas of limited head room? - Correct Answer -
Horizontal Forced Air
What is the AFUE rating of a typical medium efficiency furnace? - Correct Answer
-78% - 82%
Which category of furnace is standard atmospheric appliance? - Correct Answer -
Category 1
©COPYRIGHT 2025 ALL RIGHTS RESERVED 1
, Is a fan necessary to move the flue gases through a gravity vent? Why? - Correct
Answer -No, hot air rises.
Are high-efficiency furnaces power vented? - Correct Answer -Yes
Which Vent is the most heat resistant? - Correct Answer -Type A
On a forced draft burner, where is the fan located? - Correct Answer -Upstream
from the combustion chamber.
What is the disadvantage of oversizing a furnace? - Correct Answer -Inefficiency
How is the delivered air volume adjusted if a belt-drive fan motor is being used? -
Correct Answer -Adjusting the pulleys of the motor
Must all defective heat exchangers be replaced immediately? - Correct Answer -
Yes
A high efficiency furnace incorporates how many heat exchangers? - Correct
Answer -Two
On a furnace with no filter rack, what should be done? - Correct Answer -Rack
should be built on return duct connection
What is a plenum? - Correct Answer -Duct work system connected directly to the
furnace
©COPYRIGHT 2025 ALL RIGHTS RESERVED 2
