What Size Should My Bathroom Ventilation Fan Be? 07/28/2017Ordinary tasks like showering, bathing and shaving can put home-destructive humidity into the air in your Williamsport home. There’s good news though—a straightforward bathroom ventilation fan can protect you from distorted wood, mold growth, cracked drywall and other problems 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 soft and energy efficient as they could be? Lycoming Heating Company is here to answer your questions. Today’s bathroom ventilation fans are small and smooth and they work 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 built-in heat lamps, motion sensors and heat-exchanger ventilation that helps avoid warmed air from getting out through your ventilation. While you have 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. Graded by the cubic feet per minute (CFM) of air they move, a bathroom ventilation fan should be able to exchange 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 about the number of square feet in your bathroom. Therefore, 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 straightforward, you can use HGTV’s tips for bathrooms larger than 100 square feet – determine 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 correct size, or you know it’s the occasion for a new one, give the professionals at Lycoming Heating Company at call at 570-326-4450. We’re here to help you ensure you have a ventilation fan that will work hard to guard your home and keep it comfy. You can even schedule an appointment with us online if that’s easiest for you.