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 Belton home. There’s good news however—a simple bathroom ventilation fan can keep you from distorted wood, mold growth, broken 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 noiseless and energy efficient as they could be? Bell Air Conditioning Inc. is here to answer your questions. Today’s bathroom ventilation fans are small and modern and they operate more quietly and effectively 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 block warmed air from escaping through your ventilation. While there are a lot of bells and whistles to pick from, the most critical characteristic of your fan is whether or not it’s big enough to do its job. Assessed by the cubic feet per minute (CFM) of air they move, 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 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 adequate. If you have a taller 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 follow HGTV’s tips 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 unclear if your bathroom ventilation fan is the proper size, or you know it’s time for a new one, give the experts at Bell Air Conditioning Inc. at call at 254-939-1141. We’re here to help you ensure you have a ventilation fan that will drive hard to care for your home and keep it comfortable. You can even arrange an appointment with us online if that’s simplest for you.