What Size Should My Bathroom Ventilation Fan Be? 07/28/2017Everyday tasks like showering, bathing and shaving can put home-destructive humidity into the air in your West Valley home. There’s good news though—a simple bathroom ventilation fan can keep you from distorted wood, mold growth, cracked drywall and other trouble related 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 noiseless and energy efficient as they could be? Select Comfort System Heating & Air Conditioning is here to answer your questions. Today’s bathroom ventilation fans are small and modern and they operate more quietly and efficiently 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 block warmed air from escaping through your ventilation. While you can find a lot of bells and whistles to select from, the most important characteristic of your fan is whether or not it’s large 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 swap out 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 almost as high as 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 adequate. If you have a taller 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 simple, you can use HGTV’s tips 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 unsure if your bathroom ventilation fan is the right size, or you know it’s time for a new one, give the professionals at Select Comfort System Heating & Air Conditioning at call at 801-305-4777. We’re here to help you guarantee you have a ventilation fan that will run hard to protect your home and keep it comfortable. You can even set up an appointment with us online if that’s the most straightforward for you.