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 instructions are provided with the Model 433 shutter.
WIRE THE VENTILATOR
1. Remove the thermostat wiring box cover plate. Bring the power cable at least 6” into the thermostat wiring box. Fasten to
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