G2 Gas Technician Module 23 Revised
Why are air cleaners installed ahead of heating or cooling coils and air conditioners? -
ANS-To protect the equipment from dust and increase efficiency
What are two ways in which a mechanical filter could restrict air flow? - ANS-Dirty Air
Filter and Incorrect Air Filter
Name three types of air cleaners that can be used with a forced-air furnace? -
ANS-Media, electrostatic, and electronic
Which type of air cleaner is usually the least expensive? - ANS-Media/Mechanical
Which type of air cleaner is usually the most expensive? - ANS-Electronic (EAC)
Name two advantages of an electronic air cleaner? - ANS-Highly Efficiency and Collects
Particles
Do electronic air cleaners remove smoke odours from the conditioned air? - ANS-No
How can smoke odours be reduced? - ANS-Activated Carbon Filter/ Coal Filter
What must the gas technician do before installing any air cleaner? - ANS-Comply with
Manufacturers Instructions
If there are arrows on a filter frame, which way must they face? - ANS-Same way as the
systems air flow
Why must be done before opening the blower door on a forced-air furnace? -
ANS-Disconnect Power
How frequently should furnace filter be inspected in the heating season? - ANS-Every
Month
How frequently should filters be replaced? - ANS-Whenever they need to be.
Why can disposable filters not be re-used? - ANS-Removal of mineral oils will cause the
filter to not operate
Why are air cleaners installed ahead of heating or cooling coils and air conditioners? -
ANS-To protect the equipment from dust and increase efficiency
What are two ways in which a mechanical filter could restrict air flow? - ANS-Dirty Air
Filter and Incorrect Air Filter
Name three types of air cleaners that can be used with a forced-air furnace? -
ANS-Media, electrostatic, and electronic
Which type of air cleaner is usually the least expensive? - ANS-Media/Mechanical
Which type of air cleaner is usually the most expensive? - ANS-Electronic (EAC)
Name two advantages of an electronic air cleaner? - ANS-Highly Efficiency and Collects
Particles
Do electronic air cleaners remove smoke odours from the conditioned air? - ANS-No
How can smoke odours be reduced? - ANS-Activated Carbon Filter/ Coal Filter
What must the gas technician do before installing any air cleaner? - ANS-Comply with
Manufacturers Instructions
If there are arrows on a filter frame, which way must they face? - ANS-Same way as the
systems air flow
Why must be done before opening the blower door on a forced-air furnace? -
ANS-Disconnect Power
How frequently should furnace filter be inspected in the heating season? - ANS-Every
Month
How frequently should filters be replaced? - ANS-Whenever they need to be.
Why can disposable filters not be re-used? - ANS-Removal of mineral oils will cause the
filter to not operate
