10
PRODUCT DESIGN
Thermostats:
NOTE: Complete lineup of thermostats can be found in the Thermostat Specification Sheets.
Filters:
Filters are required with this furnace and must be provided by the installer. The filters used must comply with UL900 or
CAN/ULCS111 standards. Installing this furnace without filters will void the unit warranty.
This furnace has provisions for the installation of return air filters at the side and/or bottom return. The furnace will
accommodate the following filter sizes depending on cabinet size:
Refer to Minimum Filter Area tables to determine filter area requirement.
NOTE:
Filters can also be installed elsewhere in
the duct system such as a central return.
Upflow Filters
Disposable Minimum Filter Area (in
2
)
[
Based on a 300 ft/min filter face velocity]
*Minimum filter area dictated by heating airflow requirement.
Permanent Minimum Filter Area (in
2
)
[Based on 600 ft/min filter face velocity]
*Minimum filter area dictated by heating airflow requirement.
Cabinet
Width
(in.)
Nominal
Filter Size
(in.)
Approx.
Flow Area
(in
2
)
Cabinet
Width
(in.)
Nominal
Filter Size
(in.)
Approx.
Flow Area
(in
2
)
All
16 x 25 x 1
400
17-1/2
14 x 25 x 1
350
21
16 x 25 x 1
400
24-1/2
20 x 25 x 1
500
BOTTOM RETURN
SIDE RETURN
600
800
1000
1200
1400
1600
2000
0453_X*
188*
192
240
288
---
---
---
0703_X*
---
282*
282*
282*
336
---
---
0704_X*
---
---
260*
260*
336
384
---
0904_X*
---
---
376*
376*
376*
384
---
0905_X*
---
---
---
376*
376*
384
480
115_X*
---
---
---
470*
470*
470*
480
In
p
u
t_
_
A
irf
lo
w
COOLING AIRFLOW REQUIREMENT (CFM)
600
800
1000
1200
1400
1600
2000
0453_X*
376*
384
480
576
---
---
---
0703_X*
---
564*
564*
564*
672
---
---
0704_X*
---
---
564*
564*
672
768
---
0904_X*
---
---
752*
752*
752*
768
---
0905_X*
---
---
---
752*
752*
768
800
1155_X*
---
---
---
940*
940*
940*
800
Input
_
_
A
ir
fl
o
w
COOLING AIRFLOW REQUIREMENT (CFM)
