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CUT USING TIN SNIPS
CUT FOUR CORNERS
AFTER REMOVING SHEET
METAL
Duct Flange Cut Outs
F
- R
T
S
ILTERS
EAD
HIS
ECTION
R
A
D
ETURN
IR
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.
COOLING AIRFLOW REQUIREMENT (CFM)
600
800
0453BXA
194*
194*
0703BXA
---
324*
0704CXA
---
0904CXA
---
0905DXA
---
1155DXA
---
*Minimum filter area dictated by heating airflow requirement.
Permanent Minimum Filter Area (sq. in)
[Based on a 600 ft/min filter face velocity]
PRESS OUT BY HAND
SCRIBE LINES OUTLINING
DUCT FLANGES
B
I
T
EFORE
NSTALLING
1000
1200
1400
1600
240
288
---
---
324*
324*
336
---
---
291*
291*
336
384
---
432*
432*
432*
432*
---
---
388*
388*
388*
---
---
486*
486*
486*
0453BXA
0703BXA
0704CXA
0904CXA
0905DXA
1155DXA
*Minimum filter area dictated by heating airflow requirement.
Disposable Minimum Filter area (sq. in)
[Based on 300 ft/min filter face velocity]
HE
U
I
PRIGHT
NSTALLATIONS
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.
CENTRAL
RETURN
GRILLE
SIDE RETURN
EXTERNAL FILTER
(EITHER SIDE)
2000
---
---
---
---
480
486*
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.
H
I
ORIZONTAL
NSTALLATIONS
Filters must be installed in either the central return register or in the
return air duct work.
26
COOLING AIRFLOW REQUIREMENT (CFM)
600
800
1000
1200
388*
388*
480
576
---
647*
647*
647*
---
---
583*
583*
---
---
863*
863*
---
---
---
777*
---
---
---
971*
AIR FLOW
RACK KIT
Possible Upright Upflow
Filter Locations
1400
1600
2000
---
---
---
672
---
---
672
768
---
863*
863*
---
777*
777*
960
971*
971*
971*
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