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 Naples home. There’s good news still—a modest bathroom ventilation fan can keep you from distorted wood, mold growth, cracked 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 correct size? Are they as quiet and energy efficient as they could be? Speedy Air Conditioning is here to answer your questions.

Today’s bathroom ventilation fans are small and sleek and they run more quietly and economically than ever before. You’ll find a hefty range of options, from simple fans that will get the job done to fans with integrated 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 select from, the most important aspect of your fan is whether or not it’s big 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 exchange the air in a bathroom at least eight times an hour. With a normal 8-foot ceiling, your ventilation fan should have a CFM rating at least 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 larger ceiling, the equation gets a little more difficult. 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 use 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 unsure if your bathroom ventilation fan is the correct size, or you know it’s come to the point for a new one, give the professionals at Speedy Air Conditioning at call at 239-596-2645. We’re here to help you guarantee you have a ventilation fan that will work hard to protect your home and keep it cozy. You can even schedule an appointment with us online if that’s easiest for you.

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