What Size Should My Bathroom Ventilation Fan Be? 07/28/2017Average tasks like showering, bathing and shaving can put home-destructive humidity into the air in your Huntsville home. There’s good news however—a simple bathroom ventilation fan can save you from distorted wood, mold growth, damaged drywall and other trouble associated 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 noiseless and energy efficient as they could be? All Weather Heating & Air Conditioning Inc is here to answer your questions. Today’s bathroom ventilation fans are small and modern and they operate more quietly and efficiently than ever before. You’ll find a large range of choices, from simple fans that will get the job done to fans with fitted heat lamps, motion sensors and heat-exchanger ventilation that helps block warmed air from escaping through your ventilation. While there are a lot of bells and whistles to select from, the most imperative feature of your fan is whether or not it’s full-sized enough to do its job. Rated by the cubic feet per minute (CFM) of air they push, a bathroom ventilation fan should be able to replace the air in a bathroom at least eight times an hour. With a normal 8-foot ceiling, your ventilation fan should have a CFM rating about 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 adequate. If you have a larger ceiling, the equation gets a little more difficult. 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 simple, you can heed 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 correct size, or you know it’s the occasion for a new one, give the pros at All Weather Heating & Air Conditioning Inc at call at 256-801-4701. We’re here to help you make sure you have a ventilation fan that will work hard to guard your home and keep it cozy. You can even schedule an appointment with us online if that’s the most straightforward for you.