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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.
1. Determine the correct CFM rating for your bathroom. The first thing you need to do when installing a new bathroom fan is determine the CFM rating for your bathroom, so you can buy the appropriate strength fan. 1  CFM stands for Cubic Feet per Minute and refers to how much air the fan can move per minute.