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SINGLE DUCT APPLICATION
NOTE: In most installations it will be necessary to cut a
similar hole in the fi berboard directly under the hole in
the fl oor. However, if the fl oor is more than ten inches
deep, it will only be necessary to cut a hole for the collar
on the return air box or for the insulated duct.
3. Set the box into the opening and fasten with screws or
nails.
4. Install the fi lter and return air grille in the air box.
Figure 5. Return Air Box
Figure 6. Supply Damper
Figure 4. Single & Multiple Duct Applications
MULTIPLE DUCT APPLICATION
Locating & Installing the Supply Damper(s)
CAUTION:
If installing this air conditioning system in
conjunction with a furnace, a damper must
be installed in the furnace base assembly
to prevent cold air from being discharged
around the heat exchanger. Damage to the
heat exchanger and asphyxiation may occur if
a damper is not installed.
Check with the furnace manufacturer for damper
requirements. Failure to install the required
furnace damper may invalidate code agency
listing and limited warranty on the furnace.
When locating the supply damper(s), carefully check
fl oor joists and frame members that could interfere with
the installation of the damper or fl exible duct. Ideally, the
damper (Figure 6) should be located in the bottom of the
main duct, forward of center of the home, at least three
feet from the nearest register. The round supply opening
in the slanted side of the damper should face the side of
the home where the air conditioner is located.
1. Locate the center of the heat duct by cutting a small
hole in the fi berboard below the duct at the desired
location.
2. Cut a hole approximately 3/4" larger than the damper
opening in the fi berboard.
3. 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.
4. Insert the damper into the duct and bend over all tabs
fl at on the inside of the heat duct.
5. Seal the opening between the fi berboard and damper
or fl exible duct.
7
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