What Size Should My Bathroom Ventilation Fan Be?

Air Quality

Everyday tasks like showering, bathing and shaving can put home-harming humidity into the air in your Marshall home. There’s good news still—a modest bathroom ventilation fan can protect you from warped wood, mold growth, damaged drywall and other issues related with a humid bathroom.

Even if you have ventilation fans in your bathrooms, do you know if they’re the right size? Are they as noiseless and energy efficient as they could be? All Elements Heating & Air LLC is here to answer your questions.

Today’s bathroom ventilation fans are small and modern and they operate more quietly and efficiently than ever before. You’ll find a large range of choices, from average 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 getting out through your ventilation. While you can find 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.

Assessed by the cubic feet per minute (CFM) of air they push, a bathroom ventilation fan should be able to replace 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 almost 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 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 simple, you can heed HGTV’s guidance 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 not sure if your bathroom ventilation fan is the right size, or you know it’s time for a new one, give the experts at All Elements Heating & Air LLC at call at 903-204-7354. We’re here to help you make sure you have a ventilation fan that will drive hard to protect your home and keep it comfy. 

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