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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.
For example, a bathroom with a volume of 1000 cubic feet (28.3 cubic meters) needs a fan capable of moving (1000 / 7.5) or 133 CFM (3.8 cubic meters per minute). 5. Purchase a bathroom fan with the required CFM rating or higher. After calculating your required CFM, make sure to check the rating of any fan your purchase.