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A well-functioning bathroom ventilation fan is key to protecting your investment and preserving the air quality in your home. Ventilation fans circulate air and help to remove excess moisture, which can prevent the growth of mold and mildew. When choosing a bathroom ventilation fan, it is important to consider the cubic feet per minute (CFM) rating. This rating will tell you how much air the fan can move in a minute and is a good indicator of the fan's overall power. To calculate the CFM rating you need for your bathroom, simply multiply the length by width by height of the room. Once you have determined the CFM rating you need, select a ceiling ventilation fan that meets or exceeds that rating.