PRODUCT DESIGN
69
CIRCULATING AIR AND FILTERS
DUCTWORK - AIR FLOW
Duct systems and register sizes must be properly designed
for the C.F.M. and external static pressure rating of the fur-
nace. Ductwork should be designed in accordance with the
recommended methods of "Air Conditioning Contractors of
America" manual D.
A duct system should be installed in accordance with Stan-
dards of the National Board of Fire Underwriters for the In-
stallation of Air Conditioning, Warm Air Heating and Venti-
lating Systems, Pamphlets No. 90A and 90B.
A return air filter is not supplied with the furnace. The in-
staller must supply a means of filtering all of the return air.
Filter(s) shall comply with UL900 or CAN/ULC-S111 Stan-
dards. If the furnace is installed without filters, the warranty
will be voided.
The following two charts show the bottom and side return
filter sizes available for each size furnace. Larger sizes are
also acceptable.
Cabinet
Width
(In.)
Nominal
Filter
Size (In.)
Approx.
Flow Area
(In.)
Cabinet
Width
(In.)
Nominal
Filter
Size (In.)
Approx.
Flow Area
(In.)
All
16x25x1
400
14"
14X25X1
350
17-1/2
14X25X1
350
21
16x25x1
400
24-1/2
20X25X1
500
SIDE RETURN
BOTTOM RETURN
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.
AMV8, ADV8, AMH8, AMS8, ADS8, DDS8, DMS8,
DHS8, GMS8, GDH8, GDS8, GHS8, GME8, GMH8,
GMV8
FURNACE INPUT
FILTER SIZE
TYPE
45M
160 in
2
permanent
68M
241 in
2
permanent
90M
320 in
2
permanent
115M
400 in
2
permanent
135M
370 in
2
permanent
45M
320 in
2
disposable
68M
483 in
2
disposable
90M
640 in
2
disposable
115M
800 in
2
disposable
135M
738 in
2
disposable
PERMANENT NOMINAL 600 F.M. FACE VELOCITY
DISPOSABLE NOMINAL 300 F.M. FACE VELOCITY
MINIMUM FILTER SIZES
AMV9, ACV9, GMV9, GCV9, GMV95
600
800
1000
1200
1400
1600
2000
0453_XA
376*
384
480
576
---
---
---
0703_XA
---
564*
564*
564*
672
---
---
0704_XA
---
---
564*
564*
672
768
---
0904_XA
---
---
752*
752*
752*
768
---
0905_XA
---
---
---
752*
752*
768
800
1155_XA
---
---
---
940*
940*
940*
800
In
p
u
t_
_A
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w
COOLING AIRFLOW REQUIREMENT (CFM)
*Minimum filter area dictated by heating airflow requirement.
Disposable Minimum Filter Area (in
2
)
[
Based on a 300 ft/min filter face velocity]
600
800
1000
1200
1400
1600
2000
0453_XA
188*
192
240
288
---
---
---
0703_XA
---
282*
282*
282*
336
---
---
0704_XA
---
---
260*
260*
336
384
---
0904_XA
---
---
376*
376*
376*
384
---
0905_XA
---
---
---
376*
376*
384
480
115_XA
---
---
---
470*
470*
470*
480
Input
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A
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COOLING AIRFLOW REQUIREMENT (CFM)