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 Madera home. There’s good news though—a modest bathroom ventilation fan can protect you from warped wood, mold growth, cracked drywall and other issues 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 soft and energy efficient as they could be? Brian’s Heating & Cooling, Inc. is here to answer your questions. Today’s bathroom ventilation fans are small and modern and they run more quietly and economically than ever before. You’ll find a great 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 leaking through your ventilation. While you can find a lot of bells and whistles to select from, the most important feature 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 about 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 complicated. 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 – 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 not sure if your bathroom ventilation fan is the proper size, or you know it’s time for a new one, give the experts at Brian’s Heating & Cooling, Inc. at call at 559-675-1681. We’re here to help you guarantee you have a ventilation fan that will drive hard to guard your home and keep it comfortable. You can even schedule an appointment with us online if that’s simplest for you.