What Size Should My Bathroom Ventilation Fan Be? 07/28/2017Everyday tasks like showering, bathing and shaving can put home-damaging humidity into the air in your South Beloit and Belvidere home. There’s good news still—a straightforward bathroom ventilation fan can protect you from distorted wood, mold growth, cracked drywall and other issues 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 noiseless and energy efficient as they could be? Fleming Heating & Air Conditioning Inc. is here to answer your questions. Today’s bathroom ventilation fans are small and sleek and they work more quietly and economically than ever before. You’ll find a large range of options, from classic fans that will get the job done to fans with built-in heat lamps, motion sensors and heat-exchanger ventilation that helps avoid warmed air from escaping through your ventilation. While there are a lot of bells and whistles to pick from, the most important feature of your fan is whether or not it’s large 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 exchange the air in a bathroom at least eight times an hour. With a typical 8-foot ceiling, your ventilation fan should have a CFM rating almost as high as the number of square feet in your bathroom. Thus, if your bathroom is 5 feet by 8 feet, a CFM rating of 40 would be adequate. If you have a higher ceiling, the equation gets a little more complicated. 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 straightforward, you can heed HGTV’s tips for bathrooms larger than 100 square feet – establish your CFM requirements by increasing 50 CFM for every toilet; 50 CFM for each shower, bath and combo; and 100 CFM for each whirlpool. If you’re unsure if your bathroom ventilation fan is the proper size, or you know it’s time for a new one, give the pros at Fleming Heating & Air Conditioning Inc. at call at 877-389-2465. We’re here to help you ensure you have a ventilation fan that will drive hard to care for your home and keep it comfy. You can even set up an appointment with us online if that’s the most straightforward for you.