What Size Should My Bathroom Ventilation Fan Be? 07/28/2017Ordinary tasks like showering, bathing and shaving can put home-destructive humidity into the air in your Napoleon and Northwest Ohio home. There’s good news still—a straightforward bathroom ventilation fan can keep you from warped wood, mold growth, cracked drywall and other problems associated 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 quiet and energy efficient as they could be? Von Deylen Plumbing & Heating Inc. is here to answer your questions. Today’s bathroom ventilation fans are small and modern and they run more quietly and economically than ever before. You’ll find a hefty range of choices, from classic fans that will get the job done to fans with built-in heat lamps, motion sensors and heat-exchanger ventilation that helps prevent warmed air from getting out through your ventilation. While there are a lot of bells and whistles to select 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 move, a bathroom ventilation fan should be able to swap out 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 about the number of square feet in your bathroom. So, if your bathroom is 5 feet by 8 feet, a CFM rating of 40 would be satisfactory. If you have a taller 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 straightforward, you can use HGTV’s advice for bathrooms larger than 100 square feet – determine your CFM requirements by adding 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 right size, or you know it’s the occasion for a new one, give the experts at Von Deylen Plumbing & Heating Inc. at call at 419-592-4756. We’re here to help you ensure you have a ventilation fan that will drive hard to guard your home and keep it cozy. You can even arrange an appointment with us online if that’s easiest for you.