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Installer's Guide
TABLE 4
UPFLOW FURNACE RETURN AIR FILTERS
CABINET
CABINET
QTY*
WIDTH
BOTTOM FILTER
14-1/2"
1
14" X 25" X 1"
17-1/2"
1
17" X 25" X 1"
21"
1
20" X 25" X 1"
24-1/2"
1
24" X 25" X 1"
**NOTE: For upflow 5 ton airflow models where the airflow
requirement exceeds 1800 CFM - Models will require return air
openings and filters on: (1) both sides, or (2) one side and the
bottom, or (3) just on the bottom
e
Airf low
BOTTOM FILTER RACK INSTALLATION
r
Optional Filter Rack Accessory Kit
BAYRACK960A
10
CABINET
SIDE FILTER
17-1/2" X 25" X 1"
17-1/2" X 25" X 1"
17-1/2" X 25" X 1"
17-1/2" X 25" X 1"
Airf low
NOTE: The narrow 14.5" width furnace cabinet prevents use
of the filter rack for right side return. Pre-drill clearance
holes and then attach filter clips with the screws provided.
The filter clip with the leaf spring mounts in the rear of the
cabinet
OPTIONAL FILTER RACK INSTALLATION FOR BOTTOM
RETURN
With the filter removed, the filter rack is compressed and
then inserted into the bottom of the furnace. The retaining
screw/pin on each side inserts into engagement holes at the
bottom of the furnace cabinet side. See Figures 13, 14 & 16.
NOTE: Remove the bottom front channel to install the filter
rack in the 14-1/2" width cabinet furnaces.
t
Blower Deck
Engagement
Hole
ENGAGEMENT
HOLE DETAIL
(Typical both sides
and blower deck)
y
Furnace
Cabinet
Side
Engagement Hole
For
Filter Rack
Installation With
Bottom Return
Filter
Rack
Filter Rack
Retaining
Screw/Pin
18-CD19D7-22
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