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If you have an exhaust fan (or turbines) at the top of the space, where does the make-up air come from? Open window? Louver in the door? Should be low in the space.
Turbines will do a pretty good job if there's adequate air supply.
Should not suck air from the house... that's against fire code anyway.
So, if it's 130 in the attic and 120 outside there in Dismal, kind of a waste of money.
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