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10
3. INSTALLATION (CONT’D)
3.6 INSTALLING INSULATED FLEXIBLE DUCTS
Make sure the vapor barrier on the insulated ducts does not tear during installation to avoid condensation
within the ducts.
CAUTION
Use the following procedure for connecting the insulated flexible ducts to the unit ports (Exhaust air to outdoor and Fresh air from
outdoor). Refer to identification labels before performing any duct and port connection.
For both remaining ducts, pull back the insulation to expose
the interior flexible duct.
Connect the interior flexible duct to the smaller part of the
inner ring of the port using a tie wrap.
Pull the insulation over the joint and tuck it between the
inner and outer rings of the port. Pull the vapor barrier over
the insulation and over the outer ring of the port.
Apply duct tape gently to the joint in order to make an airtight
seal. See figures at right.
3.6.1 CONNECTION TO THE UNIT PORTS
VJ0102
Avoid compressing the insulation when you pull the tape tightly around the joint. Compressed insulation
loses its insulation properties and causes water dripping due to condensation on the exterior surface of
the duct.
CAUTION
Choose an appropriate location for installing the exterior ports:
• There must be a minimum distance of 6’ between the hoods to avoid cross-contamination
• There must be a minimum distance of 18” from the ground
3.6.2 LOCATING EXTERIOR PORTS
Make sure the fresh air intake port is
located at least 6 feet away (or more, as per
applicable building codes or standards)
from sources of contamination such as:
• Dryer exhaust, high efficiency furnace
vent, central vacuum vent
• Gas meter exhaust, gas barbecue grill
• Garbage bin
• Any exhaust from a combustion source.
WARNING
!
VD0203
6’
6’
STALE AIR
EXHAUST PORT
18’’
18’’
5’’ Ø
18’’
FRESH AIR
INTAKE PORT
OPTIONAL
LOCATION
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