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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.
Most fans are rated from 50 to 110 CFM. For bathrooms 50 square feet and smaller, get a 50 CFM fan. For bathrooms that are larger, you need to select a fan that can move at least 1 CFM per square foot of room. So, for an 80 square foot bathroom, select a fan with at least an 80 CFM rating. Determine the size of your bathroom with this formula: