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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.
If your bathroom has a higher ceiling, multiply the width x length x height of the room, divide by 60 (minutes in an hour) then multiply by 8 (number of air exchanges per hour). For example, a 10â² wide by 15â² long bathroom with a 10â² ceiling would need: 10x15x10 = 1500. 1500 Ã· 60 = 25. 25Ã8 = 200 CFM rated vent fan.