Manufacturer reserves the right to change specifications or designs without notice.
10.2019
Air Handler Unit Installation Instruction
20/20
8.
Air Filter
Filter application and replacement are critical to airflow, which may affect the heating and cooling system
performance. Reduced airflow can shorten the life of the system’s major components, such as motor, heat relays,
evaporator coil or compressor. Units should be sized for a maximum of 300 feet/min. air velocity or what is
recommended for the filter type installed.
Ensure the air flow is in the range of 300~450CFM if adding high efficiency filters or electronic air filtration
systems. Note that the overall performance and efficiency of the unit will be reduced because of pressure drop
by filters.
IMPORTANT
Do not double filter the return air duct.
Do not filter the supply air duct which will change the performance of the unit and reduce airflow .
WARNING
Do not operate the system without filters. A portion of the dust suspended in the air may temporarily lodge in
the duct. Any circulated dust particles could be heated and charred by contact with the air handler elements.
This residue could soil ceilings, walls, drapes, carpets and other articles in the house. Soot damage may occur
without filters in place when certain types of candles, oil lamps or standing pilots are burned.
Air Filter Clean/Replacement
1.
Remove bolts to take the filter cover away.
2.
Hold the edge of the air filter and extract it out .
3.
Clean the air filter or use a new one to replace.
NOTE: AIR FILTER IS NOT FACTORY INSTALLED.
Figure 8-1 Filter installation and clean
Model Number
Dimensions (in.)
Filter Size
W
D
H
A
B
24 / 36
19x20
(19x19)
19-3/4
21
1
16
13-7/8
48 / 60
23x20
23-1/4
21
1
16
15-1/4
