Filter
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Installer’s Guide
18-CD21D1-5 13
Bottom Panel
Filter
Rack
Furnace
Cabinet
Side
Filter Rack
Retaining
Screw/Pin
Engagement Hole
For
Bottom Return
Filter Rack
Installation With
Filter
Rack
Furnace
Cabinet
Side
Filter Rack
Retaining
Screw/Pin
Engagement Hole
For
Bottom Return
Filter Rack
Installation With
BLOWER
DECK
Filter
Rack
Assembly
Furnace
Blower
Deck
Filter Rack
Retaining
Screw/Pin
Engagement Hole
For
Return
Filter Rack
Installation With
Side
Furnace
Cabinet
Side
i
o
p
RETURN AIR FILTERS FOR UPFLOW FURNACE IN
HORIZONTAL CONFIGURATION
When the Upflow Furnace is installed in the horizontal
configuration, the return air filters must be installed
exterior to the furnace cabinet. Remote filter grilles
may be used for homeowner convenience or the filters
may be installed in the duct work upstream of the fur-
nace. See Figure 17.
ALTERNATE UPFLOW FILTER CLIP/ BRACKET INSTAL-
LATION - KIT09224
1.Determine the location to be used. The furnace
cabinet has dimples for location of the alternate fur-
nace clips (Side return only). Pre-drill clearance
holes with a 3/16" drill. Bottom return holes are
pre-drilled. See Figure 21.
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.
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 Fig-
ure 22. Tables 5 and 6 provide information for installa-
tion of the filter retaining brackets shipped with down-
flow furnaces.
a
REAR
SIDE
CUT-OUT
ALTERNATE FILTER
CLIPS LOCATION
s
Airflow
Optional door kit
BAYFLTR206