Whirlpool furnace User Instructions page 7

Minimum Filter Requirements
The Airflow Descriptor is the 2 digits immediately preceding
the hyphen (-) in the furnace model number. 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 (182.9 m) 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
Minimum
Airflow Area—sq. in.
Descriptor (sq. cm)
09 480 (1,219.2)
10 480 (1,219.2)
12 576 (1,463)
14 672 (1,706.9)
16 768 (1,950.7)
20, 22 960 (2,438.4)
Minimum Filter Requirements Chart
Cleanable Filters
Minimum
Airflow Area—sq. in.
Descriptor (sq. cm)
09 240 (609.6)
10 240 (609.6)
12 288 (731.5)
14 336 (929.6)
16 384 (975.4)
20, 22 480 (1,219.2)
Size— in. (cm) Qty.
20 x 25 (50.8 x 63.5) 1
20 x 25 (50.8 x 63.5) 1
16 x 20 (40.6 x 50.8) 2
20 x 20 (50.8 x 50.8) 2
20 x 20 (50.8 x 50.8) 2
20 x 25 (50.8 x 63.5) 2
Size—in. (cm) Qty.
16 x 20 (40.6 x 50.8) 1
16 x 20 (40.6 x 50.8) 1
16 x 20 (40.6 x 50.8) 1
20 x 20 (50.8 x 50.8) 1
20 x 20 (50.8 x 50.8) 1
20 x 25 (50.8 x 63.5) 1
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)
A
B
A. Filter - slides in from front of unit
B. Filter rack
C. 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 into its proper location.
Filter Location—Upflow Models (Bottom Return)
A. Side
B. Base
If the furnace has a bottom return air, remove the lower front
panel by lifting up and pulling out. The filter(s) may be removed
by lifting up and sliding toward the front. Replace in a reverse
procedure.
Filter Location—Counterflow and Horizontal Models
The filters in counterflow and horizontal furnaces are typically
placed by the installer into the return plenum of the furnace.
C
A
B
C
D
C. Filter
D. Front
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