What Size Should My Bathroom Ventilation Fan Be?

Everyday tasks like showering, bathing and shaving can put home-damaging humidity into the air in your Kingsville home. There’s good news still—a modest bathroom ventilation fan can keep you from deformed wood, mold growth, cracked drywall and other trouble connected 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? Four Seasons Air Conditioning and Heating LLC is here to answer your questions.

Today’s bathroom ventilation fans are small and modern and they run more quietly and economically than ever before. You’ll find a hefty range of choices, from classic 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 escaping through your ventilation. While you can find a lot of bells and whistles to choose from, the most critical characteristic 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 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. Therefore, 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 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 – establish your CFM requirements by adding 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 proper size, or you know it’s come to the point for a new one, give the experts at Four Seasons Air Conditioning and Heating LLC at call at 361-214-1203. We’re here to help you ensure you have a ventilation fan that will drive hard to guard your home and keep it comfy. 

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