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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.
Bathroom exhaust fans can be used with heat recovery ventilators (HRV's), but may not function as well with energy recovery ventilators (ERV's), since these devices recover the humidity that the bathroom fan is trying to eliminate. ERV's can also leak some air between the incoming and outgoing flows (up to 10%).