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9 Air Filter (Not Factory-Installed)
Filters are not included with the unit and must be field supplied.
An air filter must be installed before air enters the evaporator coil in order to protect
the coil, blower, and other internal parts from excessive dirt and dust. Consult the
filter manufacturer for proper sizing and maximum velocity requirements.
Filter application and placement 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, elements, heat relays, evaporator coil
or compressor. Consequently, we recommend that the return air duct system have
only one filter location. For systems without a return air filter grill, multiple filter
grills can be installed at each of the return air openings.
Do not double filter the return air duct system. Do not filter the supply
air duct system. This will change the performance of the unit and reduce
airflow.
WARNING: FIRE HAZARD
Do not operate the system without filters. A portion of the dust
suspended in the air may temporarily lodge in the duct runs and at
the supply registers. 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 with filters in place, when certain
types of candles, oil lamps or standing pilots are burned.
Bosch BWA Series Air Handler - BTC 761703105 A (03.2023)
10 Filter Installation Dimensions
Filters are not included with the unit and must be field supplied.
Dimensional data
Model
18/24
30/36
Table 8
Air filter removal / installation
f Hold the edge of the air filter and pull out.
f Install new filter so that the arrow on the filter is in the same direction as
airflow.
f If reusable filter is being used, please clean according to the
manufacturer's specification prior to re-installation.
Installation Instructions
Filter Size
In. [mm]
16x20 [406x508]
20x20 [508x508]
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