Lennox CG80TB - Combustible Floor Installation; Filter Rack Installation; Upflow Model Filter Location

# 45464K003 Page 11
Figure 12
Combustible Floor Installation
(Counterflow Models Only)
for more than 1600 CFM nominal air delivery include two of
each.) The filter rack is to be installed between the return
air duct and the side of furnace. Refer to Figure 13 and the
following instructions to install the filter rack:
1. Using the corner embossments as a guide, mark and
cut a full-size opening in the side panel(s).
2. Using the filter rack as a template, mark and drill four
7/64" diameter screw holes in the side panel(s).
3. With the filter access opening toward the front of the
furnace, use sheet metal screws to fasten the rack(s)
to the side panel(s).
4. Install the filter(s) in the rack(s), mesh side of filter
towards furnace.
Model AFILTHA7 external filter frame accessory is avail-
able for single side return air connection in installations
requiring more than 1600 CFM nominal air delivery.
G1N80BT, CG80TB, G1N80BR, and CG80RB Models
Filters are not supplied with G1N80BT, CG80TB, G1N80BR,
or CG80RB series furnaces since filters are commonly
located behind a return grille for ease of servicing. It is the
Figure 13
Filter Rack Mounting Hole
Screw
Filter Rack
Corner Embossments
Front of Cabinet
Filter Rack Installation
1"
Combustible
Flooring
Woven
Glass Tape
Base
Assembly
Duct
Furnace
installer’s responsibility to install properly sized filters in
accordance with Table 1 on page 12.
If filters are needed at the furnace only, use the following kits:
• AFILT524 for side return on upflow installations.
• AFILT529 for bottom return on upflow installations or
horizontal installations of G1N80BT or CG80TB fur-
naces.
• AFILT525 for counterflow installations of G1N80BR or
CG80RB furnaces.
Other filter accessories are also available from the manufac-
turer including a full line of indoor air quality products. For
information on these products, contact the local distributor.
Figure 14
Upflow Model Filter Location
BOTTOM RETURN
Filter
Base
Side
SIDE RETURN
R/A Duct
Filter Rack
Filter - Slides in from Front of Unit