What Size Should My Bathroom Ventilation Fan Be? 07/28/2017Ordinary tasks like showering, bathing and shaving can put home-harming humidity into the air in your Saint Peters home. There’s good news still—a straightforward bathroom ventilation fan can save you from deformed 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 right size? Are they as soft and energy efficient as they could be? C-N-O Comfort Zone is here to answer your questions. Today’s bathroom ventilation fans are small and modern and they operate more quietly and economically than ever before. You’ll find a great range of options, from average fans that will get the job done to fans with integrated 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 choose from, the most critical characteristic of your fan is whether or not it’s large enough to do its job. Graded by the cubic feet per minute (CFM) of air they transfer, a bathroom ventilation fan should be able to replace 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. Therefore, if your bathroom is 5 feet by 8 feet, a CFM rating of 40 would be adequate. If you have a taller 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 easy, you can use HGTV’s tips 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 proper size, or you know it’s time for a new one, give the professionals at C-N-O Comfort Zone at call at 636-578-1777. We’re here to help you ensure you have a ventilation fan that will work hard to care for your home and keep it cozy. You can even arrange an appointment with us online if that’s the most straightforward for you.