Most either come with a programmable thermostat or can be wired to one which will turn the fan on when the attic reaches a set temperature no need for flipping a switch or monitoring the attic. Sufficient air is needed for proper combustion and exhausting of attic ventilator may be wired directly to power we advise that some type of shut off switch be installed in the line. 1150 cfm galvanized steel electric powered attic fan with adjustable thermostat model gf 14 429 00 429 00.
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