3.9
I
NSTALLING
I
NSULATED
F
LEXIBLE
D
UCTS
Use the following procedure for connecting the insulated flexible ducts to the Tandem® transition* (
EXHAUST AIR TO OUTSIDE and
FRESH AIR FROM OUTSIDE).
• The joist opening needed to install the Tandem®* transition must be 9 3/4” (248 mm) minimum. Also, the maximum height of the
Tandem® transition* is 8 3/4” (222 mm). See Tandem® transition* end view below.
NOTE: If the joists are perpendicular to the ducts, or if the connection to the exterior hood is in a limited area, your installation will
need two exterior hoods instead of one. In this case, do not use the Tandem® transition*. Identify each insulated duct. For
fresh air from outside duct, use the blue sticker dots (one dot at each end). For exhaust air to outside duct, use the red
sticker dots (one dot at each end). Then, go to point 3.9.2 and refer to the optional single hood enclosed instructions.
*Patent pending.
3.9.1 C
ONNECTION TO
T
ANDEM
®
TRANSITION
1.
For each duct, pull back the insulation to expose the interior flexible duct.
2.
Connect the interior flexible duct to the smaller part of the Tandem® transition (5’’ oval) using a 24’’ tie wrap.
NOTE: If you are using a 6’’ diameter insulated duct, use the bigger part of the Tandem® transition (6’’ oval).
3.
Pull the insulation over the joint. Pull the vapor barrier over the insulation.
4.
Apply duct tape gently to the joint in order to make an airtight seal. See figures below.
Identify each insulated duct. For fresh air from outside duct, use the blue sticker dots (one dot at each end). For exhaust air to outside
duct, use the red sticker dots (one dot at each end).
Be careful to identify the exhaust air to outside duct (red dot) at the upper
section of the transition.
3. INSTALLATION OF THE THH 1.0 UNIT
(CONT’D)
CAUTION
Make sure the vapor barrier on the insulated ducts does not tear during installation.
VD0118
8 3/4"
222 mm
9 3/4"
248 mm
VJ0025
VJ0022
VJ0023
VJ0024
1
2
3
4
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