What Size Should My Bathroom Ventilation Fan Be?

Air Quality

Ordinary tasks like showering, bathing and shaving can put home-destructive humidity into the air in your Branchville home. There’s good news though—a simple bathroom ventilation fan can keep 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 soft and energy efficient as they could be? Willco Air Conditioning, Refrigeration & Heating Inc. is here to answer your questions.

Today’s bathroom ventilation fans are small and modern and they work more quietly and economically than ever before. You’ll find a large range of choices, from classic 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 leaking through your ventilation. While there are a lot of bells and whistles to select from, the most important aspect of your fan is whether or not it’s large enough to do its job.

Assessed 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 standard 8-foot ceiling, your ventilation fan should have a CFM rating almost as high as 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 adequate.

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 easy, you can follow HGTV’s tips for bathrooms larger than 100 square feet – determine 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 pros at Willco Air Conditioning, Refrigeration & Heating Inc. at call at 862-345-6896. We’re here to help you make sure you have a ventilation fan that will drive hard to guard your home and keep it cozy. 

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