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 Ridgedale and the Branson area home. There’s good news however—a simple bathroom ventilation fan can save you from warped wood, mold growth, damaged drywall and other problems 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? Branson HVAC, LLC is here to answer your questions. Today’s bathroom ventilation fans are small and modern and they work more quietly and effectively than ever before. You’ll find a great range of options, from simple fans that will get the job done to fans with integrated heat lamps, motion sensors and heat-exchanger ventilation that helps prevent warmed air from leaking through your ventilation. While there are a lot of bells and whistles to choose from, the most important characteristic of your fan is whether or not it’s big 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 replace 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. Therefore, 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 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 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 unsure if your bathroom ventilation fan is the correct size, or you know it’s the occasion for a new one, give the experts at Branson HVAC, LLC at call at 417-544-4430. We’re here to help you ensure you have a ventilation fan that will run hard to protect your home and keep it comfy. You can even schedule an appointment with us online if that’s easiest for you.