I know, a stupid question but I do not know the answer. this unit has a switch on it. Exhaust open / closed. what is this for anyway?
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I know, a stupid question but I do not know the answer. this unit has a switch on it. Exhaust open / closed. what is this for anyway?
Basically it is the same as your car, fresh air or recirculated air. Open is fresh, closed is recirculated