18
Rigid duct:
Use duct tape to connect the rigid ducts to the ports.
Make sure that the 2 balancing dampers are left in a fully open position befor
e connecting the ducts to these
ports (fresh air distribution port and stale air exhaust port as shown on figure 14).
6.0 Installation (cont’d)
figure 14
CAUTION
Do not use screws to connect rigid ducts to the ports.
6.6 C
ONNECTING
D
UCT TO THE
U
NIT
Insulated flexible duct
Use the following procedure for connecting the insulated flexible duct 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 port 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 the 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. Compressed insulation loses its R value and causes waterdripping 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
to avoid condensation within the duct.
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