What Size Should My Bathroom Ventilation Fan Be? 07/28/2017Average tasks like showering, bathing and shaving can put home-damaging humidity into the air in your Humble home. There’s good news however—a straightforward bathroom ventilation fan can keep you from distorted wood, mold growth, damaged 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 noiseless and energy efficient as they could be? Arrings A/C & Heating is here to answer your questions. Today’s bathroom ventilation fans are small and modern and they operate more quietly and effectively than ever before. You’ll find a great range of choices, from average 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 getting out through your ventilation. While you have a lot of bells and whistles to pick from, the most critical aspect of your fan is whether or not it’s full-sized enough to do its job. Rated 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 standard 8-foot ceiling, your ventilation fan should have a CFM rating at least 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 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 straightforward, you can heed HGTV’s advice for bathrooms larger than 100 square feet – verify 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 correct size, or you know it’s come to the point for a new one, give the pros at Arrings A/C & Heating at call at 281-713-8304. We’re here to help you make sure you have a ventilation fan that will drive hard to guard your home and keep it cozy. You can even set up an appointment with us online if that’s the most straightforward for you.