26
CUT FOUR CORNERS
AFTER REMOVING SHEET
METAL
CUT USING TIN SNIPS
PRESS OUT BY HAND
SCRIBE LINES OUTLINING
DUCT FLANGES
Duct Flange Cut Outs
FILTERS - READ THIS SECTION BEFORE INSTALLING THE
RETURN AIR D UCTWORK
Filters must be used with this furnace. Discuss filter maintenance
with the building owner. Filters do not ship with this furnace, but
must be provided by the installer. Filters must comply with UL900
or CAN/ULCS111 standards. If the furnace is installed without fil-
ters, the warranty will be voided.
On upflow units, guide dimples locate the side return cutout
locations. Use a straight edge to scribe lines connecting the
dimples. Cut out the opening on these lines.
NOTE: An undersized opening will cause reduced airflow.
Refer to Minimum Filter Area tables to determine filter area require-
ments.
600 800 1000 1200 1400 1600 2000
0453BXA 194* 194* 240 288 --- --- ---
0703BXA --- 324* 324* 324* 336 --- ---
0704CXA --- --- 291* 291* 336 384 ---
0904CXA --- --- 432* 432* 432* 432* ---
0905DXA --- --- --- 388* 388* 388* 480
1155DXA --- --- --- 486* 486* 486* 486*
Input__Airflow
COOLING AIRFLOW REQUIREMENT (CFM)
*Minimum filter area dictated by heating airflow requirement.
Permanent Minimum Filter Area (sq. in)
[Based on a 600 ft/min filter face velocity]
600 800 1000 1200 1400 1600 2000
0453BXA 388* 388* 480 576 --- --- ---
0703BXA --- 647* 647* 647* 672 --- ---
0704CXA --- --- 583* 583* 672 768 ---
0904CXA --- --- 863* 863* 863* 863* ---
0905DXA --- --- --- 777* 777* 777* 960
1155DXA --- --- --- 971* 971* 971* 971*
Input__Airflow
COOLING AIRFLOW REQUIREMENT (CFM)
*Minimum filter area dictated by heating airflow requirement.
Disposable Minimum Filter area (sq. in)
[Based on 300 ft/min filter face velocity]
UPRIGHT INSTALLATIONS
Depending on the installation and/or customer preference, differ-
ing filter arrangements can be applied. Filters can be installed in
the central return register or a side panel external filter rack kit. As
an alternative a media air filter or electronic air cleaner can be used
as the requested filter.
The following figure shows possible filter locations.
FILTER
AIR FLOW
CENTRAL
RETURN
GRILLE
FILTER
SIDE RETURN
EXTERNAL FILTER
RACK KIT
(EITHER SIDE)
Possible Upright Upflow
Filter Locations
NOTE: Internal filter retention is not provided on this furnace. If an
internal installation is desired, an internal filter retention kit is avail-
able as an accessory. Please see your distributor for details.
HORIZONTAL I NSTALLATIONS
Filters must be installed in either the central return register or in the
return air duct work.
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