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Every exhaust fan has a Cubic Feet per Minute (CFM) rating which shows how much air the vent can move. To be the most effective, the CFM rating of the exhaust fan should be at least half of the cubic footage of the bathroom it will be operating in.
the code doesn't look like it's prohibiting an inter-connection, only prohibiting recirculation of the air. You can't exhaust your bathroom air into the basement or the garage. Two fans on one vent (properly sized) would still vent to the outside.In my mind the question is about the size of the vent and the location of, and need for back flow dampers.he code doesn't look like it's prohibiting an inter-connection, only prohibiting recirculation of the air. You can't exhaust your bathroom air into the basement or the garage. Two fans on one vent (properly sized) would still vent to the outside.