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12
For the Installer
5.4 CONNECTING THE DUCTS TO THE UNIT
CAUTION
• Make sure that the balancing dampers are wide open before connecting the ducts to the ports.
• If ducts have to go through an unconditioned space (e.g.: attic), always use insulated ducts.
• Make sure the vapor barrier on the insulated ducts does not tear during installation to avoid condensation
within the ducts.
• Always use insulated ducts to connect the Fresh air from outdoors and Stale air to outdoors ports with the
exterior hood(s).
5.4.1 INSULATED FLEXIBLE DUCTS
1. Pull back the insulation to expose the flexible duct.
2. Attach the flexible duct to the port using a tie wrap.
3. Pull the insulation over the joint and tuck it in between the inner and outer rings of the double collar, then pull down the vapor barrier
(shaded part in illustrations below) over the insulation and tuck it in between the inner and outer rings.
4. Apply duct tape to the joint (outer ring and vapor barrier) making an airtight seal. Avoid compressing the insulation when pulling the
tape tightly around the joint. Compressed insulation loses its R value and causes water dripping due to condensation on the exterior
surface of the duct.
5.4.2 NON-INSULATED RIGID DUCTS
CAUTION
Do not use screws to connect the rigid ducts to the ports.
To avoid transmission of vibrations, always use a 6-inch section of flexible duct to connect rigid ducts to the unit. Use tie wraps to
perform connections, then seal with duct tape.
VJ0117
5.5 INSTALLING THE EXTERIOR HOODS
Refer to illustration at right to connect the insulated duct to the hoods. An “Anti-Gust
Intake Hood” should be installed in regions where a lot of snow is expected to fall.
VD0028
EXHAUST
HOOD
INTAKE
HOOD
18”
(457 MM)
18”
(457 MM)
6” ø
(152 MM)
6’
(1.8 M)
6’
(1.8 M)
18”
(457 MM)
OPTIONAL
DUCT LOCATION
TAPE AND DUCT TIE
CAULKING
Make sure that both hoods are at least 18 inches above the
ground and that the intake hood is at least 6 feet (1.8m)
away from any of the following:
• Exhaust hood
• 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.
⚠ WARNING
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