18-CD33D1-4
13
Installer’s Guide
TABLE 6
MINIMUM CLEARANCE FROM COMBUSTIBLE MATERIALS FOR
UPFLOW/HORIZONTAL AND DOWNFLOW/ HORIZONTAL FURNACES
UNIT LOCATION
FURNACE SURFACE
VERTICAL
CLOSET
HORIZONTAL
CLOSET
HORIZONTAL
ALCOVE / ATTIC
SIDES
0"
1"
0"
BACK
0"
3"
6"
TOP
1"
1"
1"
FRONT
3"
3"
18"
VENT
0"
0"
0"
NOTE: CLEARANCE REQUIRED AT TOP OF PLENUM IS 1"
UPFLOW FILTER CLIP/BRACKET INSTALLATION
1. Determine the location to be used. The furnace cabi-
net 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. See
Figure 18. Attach clip to bottom channel and rear of
unit with screws provided for bottom return.
2. Install the clips in front and rear of the desired loca-
tion using the screws provided. The filter clip with the
leaf spring mounts in the rear of the cabinet.
i
Airflo
w
DOWNFLOW/
HORIZONTAL
DOWNFLOW
Airflow
o
TYPICAL DOWNFLOW FURNACE RETURN AIR
FILTER INSTALLATIONS
These furnaces require high velocity type air filters.
Downflow furnace filters must be located outside the
furnace cabinet. Typical installations are shown in Figure
19. Tables 4, 5 and 6 provide information for installation
of the filter retaining brackets shipped with downflow
furnaces.
TABLE 4
TABLE 5
SIDE
CUT
-OUT
ALTERNATE SIDE
FILTER CLIPS
LOCATIONS
ALTERNATE BOTTOM
FILTER CLIPS LOCATIONS
CABINET
WIDTH
RETURN
DUCT
WIDTH
FILTER ACCESS
OPENING - DI-
MENSION "A"
FILTER ACCESS
OPENING -
DIMENSION "B"
14-1/2"
13-1/4"
12"
14"
17-1/2"
16-1/4"
15"
14"
21"
19-3/4"
19-1/2"
14"
24-1/2"
23-1/4"
22"
14"
CABINET
WIDTH
FILTER
SIZE
FILTER BRACKET
LOCATION *
14-1/2"
2 - 14X20X1
12-7/8"
17-1/2"
2 - 16X20X1
14-3/8"
21"
2 - 16X20X1
13-1/8"
24-1/2"
2 - 16X20X1
11-5/8"
* Location dimension is from end of duct to the screw holes for the bracket.
Optional accessory door kit BAYFLTR206 is also available with
narrow door to avoid flue piping in downflow furnaces.
