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4
PREINSTALLATION
LOCATING THE AIR FILTER
Your air fi lter 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 fi lter will be at a right angle to the air
stream.
2. Allow 25” of clearance in front of the air fi lter compartment
door to permit removal of fi lters.
See fi gure 4 for complete compartment dimensions.
AIR FLOW
FURNACE
OPENING
TRANSITION SECTION
(IF NEEDED)
AIR CLEANER
OPENING
LOCATING THE AIR FILTER
AN AIR FILTER MUST BE MOUNTED IN THE RETURN AIR DUCT OF A CENTRAL
FORCED-AIR SYSTEM, ON THE AIR ENTERING SIDE OF FURNACE.
NOT TO EXCEED 20°
DUCTWORK
AIR FLOW
AIR CLEANER
FURNACE
Figure 3
Model NO.
ABC
CFM RATING
LENGTH HEIGHT WIDTH
ACM1000M-XXX 19-13/16 18-5/16 5-7/16 600 TO 1200
ACM1400M-XXX 24-13/16 18-5/16 5-7/16 1000 TO 1600
ACM1600M-XXX 19-13/16 22-5/16 5-7/16 1200 TO 1800
ACM2000M-XXX 24-13/16 22-5/16 5-7/16 1800 TO 2200
C
B
A
Figure 4
3. The air fi lter is not to be placed in the discharge of either the
heating or cooling unit.
4. IMPORTANT: If atomizing spray type humidifi er is used, it
must be installed downstream from the air fi lter.
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).