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ATTIC FAN - Gable
(Power Attic Ventilator)
INSTALL THE VENTILATOR
1. The ventilator is designed to mount behind existing louvers.
Find the type of louver you have in the examples below. If no
louver exists, one must be installed. Louver should be mounted
in the center of the upper portion of the gable as high as pos-
sible. For maximum
be greater than the outlet area of the ventilator.
There is some loss in fan output because the louver blocks
some of the air
Metal louvers have more open area than
wood louvers and usually allow more air
When installing the ventilator behind louvers, you should seal
any louver area not covered by the ventilator housing band
to prevent air leakage and recirculation. We suggest you
mount the ventilator on a piece of plywood for best sealing.
Allow at least two square feet of air intake area for each fan.
CAUTION! When installing louvers or shutters, do not
remove any existing structural members without pro-
viding alternate support members.
The ventilator can be mounted
louver by fastening through the mounting brackets to the frame
of the louver.
On a wide louver the brackets can
backside of two boards of the appropriate length and these
boards can then be fastened to the frame.
With a narrow louver mounted between studs on 16" centers,
two of the brackets can
boards and the boards and other brackets nailed to the studs.
the area of the louver should
to a rectangular type
be fastened to the
be mounted to the backside of
The ventilator can also be mounted
louver.
On large triangular louvers, mount to the frame or nail boards
to the frame to provide a mounting surface for the ventilator.
For the most
installation, enclose the louver area
not covered by the fan, with plywood or similar material.
Louvers that are smaller than the ventilator outlet will restrict
air delivery. When this condition exists, a chamber should be
built to properly direct the air through the louvers. A typical
example of the suggested construction is shown.
An automatic shutter, may also be installed to
provide the necessary outlet for the fan.
in an odd shaped
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