What Size Should My Bathroom Ventilation Fan Be? 07/28/2017Average tasks like showering, bathing and shaving can put home-harming humidity into the air in your San Angelo home. There’s good news though—a straightforward bathroom ventilation fan can save you from warped wood, mold growth, cracked 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 correct size? Are they as quiet and energy efficient as they could be? Air-Dynamics Inc is here to answer your questions. Today’s bathroom ventilation fans are small and sleek and they work more quietly and economically than ever before. You’ll find a great range of options, from simple fans that will get the job done to fans with fitted heat lamps, motion sensors and heat-exchanger ventilation that helps block warmed air from leaking through your ventilation. While there are a lot of bells and whistles to select from, the most imperative characteristic 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 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 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 satisfactory. If you have a higher 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 easy, you can use HGTV’s tips for bathrooms larger than 100 square feet – establish 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 right size, or you know it’s time for a new one, give the pros at Air-Dynamics Inc at call at 325-655-2515. We’re here to help you ensure you have a ventilation fan that will work hard to guard your home and keep it comfortable. You can even schedule an appointment with us online if that’s simplest for you.