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 Manassas Park home. There’s good news still—a simple bathroom ventilation fan can save 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? Woody's Sudden Service Inc is here to answer your questions. Today’s bathroom ventilation fans are small and sleek and they run more quietly and efficiently than ever before. You’ll find a hefty range of options, from average fans that will get the job done to fans with built-in heat lamps, motion sensors and heat-exchanger ventilation that helps avoid warmed air from leaking through your ventilation. While you can find a lot of bells and whistles to choose from, the most critical aspect of your fan is whether or not it’s large 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 swap out 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 sufficient. 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 simple, you can heed HGTV’s guidance 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 the occasion for a new one, give the pros at Woody's Sudden Service Inc at call at 703-369-5528. We’re here to help you ensure you have a ventilation fan that will run hard to protect your home and keep it cozy. You can even set up an appointment with us online if that’s easiest for you.