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From below, cut out the drywall inside the framed box to create an opening to the attic. To know where to cut, use
a stud fi nder to locate the studs from below or drill pilot holes from above.
In this confi guration, a notch will need to be cut in the Grille in order to accomodate the center joist running
across the opening. Procedures for this step are included in the INSTALLATION: GRILLE section of this manual.
The center joist across the opening will not signifi cantly disturb the fl ow of air to the fan. For Figure 2B & 2C
confi guration, the fan components will need to be lifted into the attic area using another access point that has
a clear opening of 22-1/2" x 26-1/2" dimensions.
FIGURE 2A
FIGURE 2B
FIGURE 2C
INSTALLATION: BACKDRAFT DAMPER
The next step in this fan's installation is to install the
backdraft damper within the "box" that was built in the
previous step.
However, before proceeding further, please make
sure to pass the fan assembly, backdraft damper,
transition collar, and ductwork through the opening
created in the previous step and into the attic.
These subcomponents have been designed to fi t
through the clear opening. Since they may not fi t
through the attic's crawl hole, they must be in the attic
before proceeding further.
Once in the attic, verify the backdraft damper
FIGURE 3
collar is installed to the backdraft damper itself.
Using the 12 provided ¼" phillips head damper
screws, secure the collar to the damper at each of the
12 brackets around the circular rim of the damper and
pilot holes in the cone (shown in Figure 3 at right).
Lower the backdraft damper into the framed "box"
previously constructed, resting it on the joists using the
mounting brackets shown at right in Figure 4. Fasten the
damper box to the joists using wood screws through
the pilot holes on mounting brackets.
Then, return to the living space. Further secure the
damper box to the joists with wood screws through the
four pilot holes in the body of the damper box.
FIGURE 4
P/N 780100500 05/19 Rev B
page 6 of 16
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