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Filter Maintenance - Whirlpool GAS FURNACE User Instructions

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Vent Maintenance
IMPORTANT:
It is recommended that the furnace be inspected and
serviced at least once a year by a qualified person.
Should the vent system become blocked at anytime, your
furnace is equipped with a special safety control to prevent
operation of the furnace until the condition has been
corrected. If this occurs, contact a qualified person.
Keep the outside area where the vent terminates clear from
any obstructions which might block or impede the venting of
the furnace.

Filter Maintenance

Your furnace may use either a disposable filter or a cleanable
filter.
IMPORTANT:
Do not operate your furnace without a filter. A filter is required
to protect the coil, blower, and internal parts from excessive
dirt and dust.
The air filter should be inspected at least every 6 weeks and
cleaned or replaced as required.
NOTE: Dirty filters are the most common cause of inadequate
heating or cooling performance and can sharply increase the
operating costs of your unit.
When changing any furnace filter, it is important to measure
the filter being replaced and to replace it with the same size
and type of filter.
Install new/clean filters with the arrows on the side pointing in
the direction of airflow.
Replacing/Cleaning Filters
Disposable Filter(s)
If a disposable filter is used, replace with the same filter type
and size.
Cleanable Filter(s)
Cleanable filters may be replaced with disposable filters. See
the Minimum Filter Requirements chart when selecting the
proper size and quantity of disposable filters.
To clean the filter, follow the filter manufacturer's instructions.
Minimum Filter Requirements
The Airflow Descriptor is the 2 digits immediately preceding
the hyphen (-) in the furnace model number. Example 16 is
the Airflow Descriptor for furnace model WFAT075B16-1A.
The model number is located on the rating plate inside the
access panel.
Areas and dimensions shown for cleanable filters are based
on filters rated at 600 ft per minute face velocity.
Typical filter sizes are shown; however, any combination of
filters whose area equals or exceeds the minimum area
shown is satisfactory.
Minimum Filter Requirements Chart
Disposable Filters
Airflow
Min. Area
Size
Descriptor
(sq. in.)
(in.)
09
480
20 x 25
10
480
20 x 25
12
576
16 x 20
14
672
20 x 20
16
768
20 x 20
20, 22
960
20 x 25
Filter Location
The filter on your furnace will be located in one of several places
on the unit, depending on which furnace style you own. See the
sections following to determine where your filter is located.
Filter Location - Upflow Models (Side Return)
1
2
1. Filter - slides in from front of unit
2. Filter rack
3. Return air duct
If the filter is located in an external filter rack or cabinet on either
side of the furnace cabinet, it may be easily removed, cleaned or
changed, and reinserted in its proper location.
Cleanable Filters
Qty. Min. Area
Size
Qty.
(sq. in.)
(in.)
1
240
16 x 20
1
1
240
16 x 20
1
2
288
16 x 20
1
2
336
20 x 20
1
2
384
20 x 20
1
2
480
20 x 25
1
3
5

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