What Size Should My Bathroom Ventilation Fan Be? 07/28/2017Everyday tasks like showering, bathing and shaving can put home-harming humidity into the air in your Show Low 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 proper size? Are they as noiseless and energy efficient as they could be? Rim Country Mechanical, Inc. is here to answer your questions. Today’s bathroom ventilation fans are small and modern and they work more quietly and economically than ever before. You’ll find a large 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 block warmed air from getting out through your ventilation. While you can find a lot of bells and whistles to select from, the most imperative aspect of your fan is whether or not it’s big enough to do its job. Graded by the cubic feet per minute (CFM) of air they push, 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 almost as high as 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 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 simple, you can use HGTV’s advice for bathrooms larger than 100 square feet – establish your CFM requirements by increasing 50 CFM for every toilet; 50 CFM for each shower, bath and combo; and 100 CFM for each whirlpool. If you’re not sure if your bathroom ventilation fan is the right size, or you know it’s come to the point for a new one, give the professionals at Rim Country Mechanical, Inc. at call at 928-537-1803. We’re here to help you make sure you have a ventilation fan that will drive 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.