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 Macon home. There’s good news though—a simple bathroom ventilation fan can keep you from deformed wood, mold growth, broken 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 right size? Are they as soft and energy efficient as they could be? Air Temperature Control is here to answer your questions. Today’s bathroom ventilation fans are small and sleek and they work more quietly and efficiently than ever before. You’ll find a great range of selections, from simple fans that will get the job done to fans with fitted heat lamps, motion sensors and heat-exchanger ventilation that helps prevent warmed air from escaping through your ventilation. While you have a lot of bells and whistles to choose from, the most important aspect of your fan is whether or not it’s large enough to do its job. Assessed by the cubic feet per minute (CFM) of air they push, a bathroom ventilation fan should be able to swap out 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. Thus, if your bathroom is 5 feet by 8 feet, a CFM rating of 40 would be sufficient. 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 follow 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 proper size, or you know it’s the occasion for a new one, give the experts at Air Temperature Control at call at 478-784-1109. We’re here to help you ensure you have a ventilation fan that will work hard to care for your home and keep it comfy. You can even arrange an appointment with us online if that’s simplest for you.