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Installer's Guide
RETURN AIR FILTERS FOR UPFLOW FURNACE
IN HORIZONTAL CONFIGURATION
When the Upflow Furnace is installed in a horizontal configu-
ration, the filter must never be installed inside or outside the
cabinet directly above the blower assembly. See Figure 10
(page 11). Remote filter grilles may be used for homeowner
convenience or the filters may be installed in the duct work
upstream of the furnace. See Figures 20 (page 13).
ALTERNATE UPFLOW
FILTER CLIP / BRACKET INSTALLATION - KIT09224
1. Determine the location to be used. The furnace cabinet
has dimples for location of the alternate furnace clips
(Side return only). Pre-drill clearance holes with a
3/16" drill. Bottom return holes are pre-drilled.
2. Install the clips in front and rear of the desired location
using the screws provided. The filter clip with the leaf
spring mounts in the rear of the cabinet. See Figure 21.
a
Optional horizontal filter conversion kits are BAYFLTR203
for 17 1/2" width cabinets, BAYFLTR204 for 21" width
cabinets, and BAYFLTR205 for 24" width cabinets. These
include filters and brackets necessary for horizontal filters.
In addition, optional door kit BAYFLTR206 is also available.
See Figures 20.
INSTALLING THE OPTIONAL FILTER
The filter may need to be cut to fit the unit depending on the
location of the return air filter.
A score line and the words "CUT HERE" are located on the
end of the filter. If your application requires cutting the filter,
do so as indicted by the score mark.
TABLE 7
UNIT
SIZE
BOTTOM
14-1/2"
CUT ON LINE DO NOT CUT
17-1/2"
DO NOT CUT DO NOT CUT
21"
DO NOT CUT CUT ON LINE
24-1/2"
DO NOT CUT CUT ON LINE
14
ALTERNATE FILTER
CLIPS LOCATION
RETURN AIR
SIDE
TYPICAL DOWNFLOW FURNACE
RETURN AIR FILTER INSTALLATIONS
i
s
d
Two high velocity type air filters are required for each down-
flow furnace. Downflow furnace filters must be located
outside the furnace cabinet. Typical installations are shown
in Figures 22 and 23. Tables 8 and 9 provide information for
installation of the filter retaining brackets shipped with
downflow furnaces.
TABLE 8
CABINET
FILTER
WIDTH
SIZE
14-1/2"
2 - 14X20X1
17-1/2"
2 - 16X20X1
21"
2 - 16X20X1
24-1/2"
2 - 16X20X1
* Location dimension is from end of duct to the screw holes for the bracket.
TABLE 9
RETURN
FILTER ACCESS
CABINET
DUCT
WIDTH
WIDTH
DIMENSION "A"
14-1/2"
13-1/4"
17-1/2"
16-1/4"
21"
19-3/4"
24-1/2"
23-1/4"
Optional door kit
BAYFLTR206
FILTER BRACKET
LOCATION *
12-7/8"
14-3/8"
13-1/8"
11-5/8"
FILTER ACCESS
OPENING -
OPENING -
DIMENSION "B"
12"
14"
15"
14"
19-1/2"
14"
22"
14"
18-CD29D1-3
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