18-CD26D1-10 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 23.
Airflow
BLOWER
DECK
Filter
Rack
Assemb
Furnace
Blower
Deck
Filter Rack
Retaining
Screw/Pin
Engagement Hole
For
Return
Filter Rack
Installation With
Side
urnace
Cabinet
Side
Figure 19
CHAMFER
END OF
FILTER GOES
INTO FILTER
RACK FIRST
Airflow
Figure 22
Typical Horizontal Filter Installation
Figure 23
BOTTOM ENGAGEMENT
Bottom Pane
Filt
Rac
Furnace
Cabinet
Side
Filter Rack
Retaining
Screw/Pin
ngagement Hole
For
Bottom Return
Filter Rack
Installation With
Figure 18
Figure 21
RETAINING
PIN
Both Sides)
SPRINGS
CUTOUT
FILTER
RACK
RAILS
BOTTOM
PANEL
INSTALLED
Airflow
Typical Upflow Left Side Return Filter Rack Installation
RETAINING
PIN
(Both Side
SPRINGS
SIDE
CUTOUT
FILTER
RACK
RAILS
BOTTOM
PANEL
INSTALLED
Airflow
Typical Upflow Right Side Return Filter Rack Installation
Figure 20
Optional door kit
BAYFLTR206