What Size Should My Bathroom Ventilation Fan Be?

Average tasks like showering, bathing and shaving can put home-harming humidity into the air in your Moline home. There’s good news still—a modest bathroom ventilation fan can protect you from warped wood, mold growth, cracked 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? Freed Heating & Air Conditioning is here to answer your questions.

Today’s bathroom ventilation fans are small and modern and they work more quietly and efficiently than ever before. You’ll find a great range of selections, from simple fans that will get the job done to fans with fitted heat lamps, motion sensors and heat-exchanger ventilation that helps block warmed air from getting out through your ventilation. While you have a lot of bells and whistles to choose from, the most imperative aspect 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 push, 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. So, if your bathroom is 5 feet by 8 feet, a CFM rating of 40 would be satisfactory.

If you have a higher 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 straightforward, you can heed HGTV’s advice for bathrooms larger than 100 square feet – establish 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 unclear if your bathroom ventilation fan is the right size, or you know it’s the occasion for a new one, give the professionals at Freed Heating & Air Conditioning at call at 309-323-9584. We’re here to help you guarantee you have a ventilation fan that will drive hard to guard your home and keep it cozy. 

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