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Next, slide one end of the fl exible ductwork over the backdraft
damper's transition collar and secure it thereto into place by
sandwiching ductwork between backdraft damper collar and sheet
metal ring using sheet metal screws, as shown at right in Figure 10.
If needed, the backdraft damper transition collar can be rotated
to better align the hooks and latches. Simply unscrew the screws
securing the cone to the backdraft damper (highlighted in Figure
3) rotate the cone, and reattach it to the damper using the screws.
Adhere to the following guidelines when attaching the ductwork to
the backdraft damper and fan cone:
• Make sure to maintain the full diameter of the ductwork through
the bend; this provides adequate airfl ow and helps minimize
noise.
• Avoid sharp bends in the ductwork or contact with metal
fi xtures, pipes, or conduits.
• The section of ductwork immediately before the fan should be
as straight as possible.
• The ductwork can be supported under the bend using the pro-
vided polypropylene webbing. The webbing can be attached
to the rafters using wood screws, nails, or staples. Fold over the
end of the webbing at the attachment point so that the screw,
nail, or staple is securing it to the rafter through 2 layers.
Once the fan assembly is balanced and secure, use the provided
duct tape to seal the joints between the ductwork and the back-
draft damper; the ductwork and the fan cone; and, the fan cone
and fan assembly.
INSTALLATION: GRILLE
The next step in this fan's installation is to mount the cube core grille over the interior opening in the ceiling
previously created.
First, from the living area, use latex caulk to seal all wood-to-wood and wood-to-metal joints. This ensures that
all air drawn into the fan will be from within the living space.
Then, attach the grille to the joists using the 8 provided white head screws. We advise pre-drilling pilot holes for
these screws. If the home's framing is 16" O.C., use a dremel tool or hacksaw to cut two notches in the grille's
fl ange to accomodate the middle stud. Figure 11 below shows this notch.
FIGURE 11
page 9 of 16
FIGURE 10
P/N 780100500 05/19 Rev B
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