I used a regular box fan as an exhaust fan for a long time it was hooked to a thermostat, the louvers can be bought separate, all we did was cut out a piece of plywood . There are some fans that have a built in thermostat .
I have a friend that used an attic fan installed vertical with it's own thermostat . I ran across a regular green house fan for cheap, using it now . Gin
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Life is a great big canvas, and you should throw all the paint on it you can.
-Danny Kaye
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