7
4.2 CONNECTING DUCTS TO THE UNIT
Insulated flexible ducts:
Use the following procedure for connecting the insulated flexible ducts to the ports on the
unit (exhaust to outside and fresh air from outside).
a) Pull back the insulation to expose the flexible duct.
b) Connect the interior flexible duct to the opening using a duct tie.
c) Carefully seal the connection with duct tape.
d) Pull the insulation over the joint and tuck it between the inner and outer rings of double collar.
e) Pull the vapor barrier over the insulation and over the outer ring of the double collar.
f) Apply duct tape to the joint making an air
tight seal. Avoid compressing the insulation
when you pull the tape tightly around the joint. A compressed insulation loses its R value
and also causes water dripping due to condensation on the exterior surface of the duct.
a) b) c) d), e) f)
CAUTION
Make sure that the vapor barrier on the insulated ducts does not tear
during installation.
4.3 INSTALLING EXTERIOR HOODS
Choose an appropriate location for installing the exterior hoods:
• A distance of at least 6 feet (1.8 m) one from the other
• A distance of 18 inches (457 mm) from the ground
Make sure the intake hood
is at least 6 feet (1.8 m) away from any of the following:
• dryer exhaust, high efficiency furnace vent, central vacuum vent
• gas meter exhaust, gas barbecue-grill
• any exhaust from a combustion source
• garbage bin and any other source of contamination
Refer to Figure 4 for connecting the insulated ducts to the hoods. An “Anti-Gust Intake
Hood” should be installed in regions where a lot of snow is expected to fall.
VD0034
Figure 4
Exhaust hood
Optional duct
location
Intake
hood
6ӯ
(152 mm)
18”
(457mm)
18” (457mm)
18” (457mm)
6’ (1.8m)
6’ (1.8m)
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