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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.
Your bathroom ventilation fans might turn on when you flip the switch, but that doesnât mean itâs working. Bathroom exhaust fans are rated based on the volume of air they move. For example, a fan rated at 100 CFM will move 100 cubic feet of air per minute. A fan rated at 100 CFM would be ideal for a 100-square foot bathroom. Generally, the higher the CFM rating, the more effective the fan.