18-CD30D1-12 13
Installer’s Guide
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 furnace. See
Figure 20. Conversion kits for horizontal filter installation
are shown in Table 4A.
Conversion kits for horizontal filters 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. See Figure 20.
UPFLOW FILTER CLIP/ BRACKET INSTALLATION
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. 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 location
using the screws provided. The filter clip with the leaf
spring mounts in the rear of the cabinet. See Figure
21.
Typical Horizontal Filter Installation
Airflow
p
BLOWER
DECK
i
Filter
Rack
Assembly
Furnace
Blower
Deck
Filter Rack
Retaining
Screw/Pin
Engagement Hole
For
Return
Filter Rack
Installation With
Side
Furnace
Cabinet
Side
o
Table 4A CONVERSION KITS FOR
HORIZONTAL FILTERS
MODEL NUMBERS
CABINET
WIDTH
CONVERSION
KIT NUMBER
*UHMB060ACV3VB
*UHMB080ACV3VB
17-1/2" BAYFLTR203
*UHMC100ACV4VB
21" BAYFLTR204
*UHMD120ACV5VB
24-1/2" BAYFLTR205
1. *First letter may be "A" or "T"
2. Kit includes Filters and Brackets necessary for Horizontal Filters.
CHAMFER
END OF
FILTER GOES
INTO FILTER
RACK FIRST
Airflow
a
SIDE
CUT-OUT
ALTERNATE SIDE
FILTER CLIPS
LOCATIONS
ALTERNATE BOTTOM
FILTER CLIPS LOCATIONS
Accessory filter kit BAY-
FLTR203, 204, or 205 used
for Upflow Horizontal
furnaces.
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