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2
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5
SINGLE DUCT APPLICATION
Ref. No.
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2
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7
duct at the desired location. After locating the
duct center, cut a hole approximately 3/4" larger
than the damper opening in the fi berboard. Cut
a 9-1/8" x 13-1/8" hole in the duct and bend
over all tabs fl at on the inside of the heat duct.
After inserting the damper into the duct, bend
over all tabs fl at on the inside of the heat duct.
Seal the opening between the fi berboard and
damper or fl exible duct.
DUCTING SYSTEM
DUCT REQUIREMENTS
The supply duct system, including the number
and type of registers, will have much more ef-
fect on the performance of an air conditioning
system than any other factor. The duct must be
suffi ciently large to conduct an adequate amount
of air to each register.
Air ducts should be installed in accordance with
the standards of the National Fire Protection
Association "Standard for Installation of Air
Conditioning and Ventilation Systems" (NFPA
TYPICAL APPLICATIONS
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2
1
MULTIPLE DUCT APPLICATION
Description
12" x 20" Return Air
16" x 20" Air Filter
12" x 20" Grille
Supply Damper
14" Diameter Flex Return Duct
12" Diameter Flex Supply Duct
12" x 12" x 12" "Y" Fitting
Figure 6. Typical Applications
90A), "Standard for Installation of Residence
Type Warm Air Heating and Air Conditioning
Systems" (NFPA 90B), these instructions, and
all applicable codes.
THE AIR CONDITIONING OUTPUT OF THE
SYSTEM WILL NOT COOL THE HOME IF THE
AIR IS LOST TO THE OUTSIDE THROUGH
LEAKS IN THE DUCT SYSTEM. ALSO, DUCTS
WHICH ARE COLLAPSED OR RESTRICTED
BY FOREIGN OBJECTS WILL PREVENT
ADEQUATE AIR FLOW.
Note: For highly resistive duct systems it may
be necessary to add an additional return air duct
and or supply to achieve maximum performance
and prevent coil icing and refrigerant fl ood
back.
CONNECTING THE RETURN AND SUPPLY
AIR FLEXIBLE DUCTS
a.
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6
7
5
The supply duct for all units is 12" in diam-
eter. The return duct is 14" diameter for all
air conditioning units.
4
6
7
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