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?
[IMG]http://ecx.images-amazon.com/images/I/51%2BfhmkstgL._SS500_.jpg[/IMG] [URL="http://ecx.images-amazon.com/images/I/51%2BfhmkstgL._SS500_.jpg"] [/URL]
Basically it is the same as your car, fresh air or recirculated air. Open is fresh, closed is recirculated
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