What Size Should My Bathroom Ventilation Fan Be?

Air Quality

Average tasks like showering, bathing and shaving can put home-destructive humidity into the air in your Northwest Arkansas home. There’s good news though—a straightforward bathroom ventilation fan can keep you from distorted wood, mold growth, broken drywall and other problems 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 quiet and energy efficient as they could be? AirTech Heating and Air Conditioning, LLC is here to answer your questions.

Today’s bathroom ventilation fans are small and smooth and they work more quietly and effectively than ever before. You’ll find a hefty range of selections, from classic 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 have a lot of bells and whistles to pick from, the most important characteristic of your fan is whether or not it’s big 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 exchange 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 sufficient.

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 – determine your CFM requirements by toting 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 correct size, or you know it’s the occasion for a new one, give the professionals at AirTech Heating and Air Conditioning, LLC at call at 479-372-4304. We’re here to help you make sure you have a ventilation fan that will work hard to protect your home and keep it comfortable. You can even schedule an appointment with us online if that’s easiest for you.

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