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PREINSTALLATION
LOCATING THE AIR FILTER
Your air filter must be mounted in the return air duct of a
central forced-air system, on the air entering side of your
furnace. (See Figure 3 for example.)
Select a location that meets the following:
1. The face of the filter will be at a right angle to the air
stream.
2. Allow 25" of clearance in front of the air filter compart-
ment door to permit removal of filters.
See figure 4 for complete compartment dimen-
sions.
3. The air filter is not to be placed in the discharge of
either the heating or cooling unit.
4. IMPORTANT: If atomizing spray type humidifier is
used, it must be installed downstream from the air
filter.
If furnace opening cannot be enlarged to required size, a
transition sheet metal section must be used. Transition
must be planned for each job. Reduction should not be
more than 4 inches per linear foot, approximately 20
angular degrees (Figure 3).
NOT TO EXCEED 20
AIR FLOW
FURNACE
OPENING
FURNACE
TRANSITION SECTION (IF NEEDED)
Model No.
A
ACB/ACM1000 20-1/4 12-5/8 13-9/16 16-7/16 19-1/16
ACB/ACM1400 26-1/4 23-5/8 13-9/16 16-7/16 19-1/16
ACB/ACM1600 20-1/4 12-5/8
ACB/ACM2000 26-1/4 23-5/8
4
THIS CABINET
CAN ACCEPT
ELECTRONIC
AIR CLEANER
OPTION
(SEE PAGE 7)
AIR FLOW
AIR CLEANER
OPENING
AIR CLEANER
DUCTWORK
Figure 3
B
C
D
17-3/4
20-5/8
17-3/4
20-5/8
Figure 4
E
23-3/8
23-3/8
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