Installer’s Guide
FILTER RACK INSTALLATION FOR SIDE RETURN AIR ON UPFLOW FURNACES (Left or Right)
The following checklist should be used when installing a right or left side return filter on an upflow furnace:
a. Remove the filter.
b. Remove the filter rack.
c. Leave the bottom panel in place.
e. Make side cutout by following the directions in the “Return Air Duct Connections” section on page 10.
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BLOWER
DECK
Furnace
Cabinet 
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| Engagement Hole | Furnace | ||||
| For Filter Rack | Blower | ||||
| Installation With | Deck | ||||
| Side Return | |||||
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Filter Rack | Filter |
Retaining | Rack |
Screw/Pin | Assembly |
e.Compress the filter rack and reinstall in the side position on the furnace. Confirm that the upper retaining pin/screw locks into the engage- ment hole in the blower deck and the lower pin/ screw rests against the side of the bottom panel. See Figures
f.Reinstall the furnace filter in the side position by inserting the chamfer end first into the filter rack.
SIDE
eCUTOUT
Airflow
RETAINING PIN
(Both Sides)
SPRINGS
FILTER BOTTOM
RACK PANEL
RAILS INSTALLED
Typical Upflow Left Side Return Filter Rack Installation
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| CUTOUT | |
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| RETAINING |
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| PIN |
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SPRINGS
BOTTOM
PANEL FILTER
INSTALLED RACK
RAILS
Typical Upflow Right Side Return Filter Rack Installation
12
Filter
FurnaceRack
Cabinet
Side
y
Filter Rack
Retaining
Screw/Pin
Engagement Hole
For Filter Rack
Installation With
Bottom Return
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 hori- zontal filters. In addition, optional door kit BAYFLTR206 is also available. See Figures 17 and 19.
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.
u
Airflow
Optional door kit
BAYFLTR206
Typical Horizontal Filter Installation