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Re: Exhaust Fans
Excellent post Dave. I have a 12x20 room in which my 300cfm exhaust fan is adequate for 2 smokers. It starts getting kinda nasty with 3 smokers but manages to keep any smoke from entering the rest of the house (the beauty of that negative pressure you mention).
I have sealed off my cold air return completely and rely on gaps in the door frame, closet and false ceiling for makeup air. Probably need to consider a heated makeup air duct for next year. I chose a relatively low cfm to balance my need for exhaust with the need to pay high heating bills.
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