What Size Should My Bathroom Ventilation Fan Be? 07/28/2017Average tasks like showering, bathing and shaving can put home-damaging humidity into the air in your West Palm Beach home. There’s good news still—a simple bathroom ventilation fan can save you from deformed wood, mold growth, cracked drywall and other trouble connected with a humid bathroom. Even if you have ventilation fans in your bathrooms, do you know if they’re the proper size? Are they as soft and energy efficient as they could be? Arnold's Air Conditioning of South Florida Inc is here to answer your questions. Today’s bathroom ventilation fans are small and smooth and they run more quietly and effectively than ever before. You’ll find a great range of choices, from simple fans that will get the job done to fans with integrated heat lamps, motion sensors and heat-exchanger ventilation that helps block warmed air from leaking through your ventilation. While you have a lot of bells and whistles to choose from, the most imperative feature of your fan is whether or not it’s large enough to do its job. Assessed by the cubic feet per minute (CFM) of air they push, a bathroom ventilation fan should be able to exchange the air in a bathroom at least eight times an hour. With a standard 8-foot ceiling, your ventilation fan should have a CFM rating almost as high as the number of square feet in your bathroom. Therefore, if your bathroom is 5 feet by 8 feet, a CFM rating of 40 would be satisfactory. If you have a larger ceiling, the equation gets a little more complex. You’ll want to multiply the width of the room by its height and length, divide it by 60 and multiply by 8. Or, to keep it easy, you can use HGTV’s advice for bathrooms larger than 100 square feet – determine your CFM requirements by toting 50 CFM for every toilet; 50 CFM for each shower, bath and combo; and 100 CFM for each whirlpool. If you’re not sure if your bathroom ventilation fan is the right size, or you know it’s time for a new one, give the pros at Arnold's Air Conditioning of South Florida Inc at call at 561-515-5527. We’re here to help you guarantee you have a ventilation fan that will work hard to guard your home and keep it comfy. You can even schedule an appointment with us online if that’s the most straightforward for you.