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2
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 efficiency, the area of the louver should
be greater than the outlet area of the ventilator.
There is some loss in fan output because the louver blocks
some of the air flow. Metal louvers have more open area than
wood louvers and usually allow more air flow.
When installing the ventilator behind louvers, you should seal
off 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 one square foot of air intake area for every 300 CFM of
ventilator capacity.
CAUTION! When installing louvers or shutters, do not re-
move any existing structural members without providing
alternate support members.
The ventilator can be mounted flush to a rectangular type
louver by fastening through the mounting brackets to the
frame of the louver.
On a wide louver the brackets can first be fastened to the
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 first be mounted to the backside of
boards and the boards and other brackets nailed to the studs.
The ventilator can also be mounted off-center in an odd
shaped 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 effective 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, Model 433, may also be installed to
provide the necessary outlet for the fan. Installation instruc-
tions are provided with the Model 433 shutter.
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