professional checking a bathroom ventilation fan

What Size Should My Bathroom Ventilation Fan Be?

Ordinary tasks like showering, bathing and shaving can put home-damaging humidity into the air in your Upland home. There’s good news however—a simple bathroom ventilation fan can protect 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 right size? Are they as noiseless and energy efficient as they could be? Klaus & Sons Heating & Air Conditioning is here to answer your questions.

Today’s bathroom ventilation fans are small and modern and they operate more quietly and economically than ever before. You’ll find a hefty range of selections, from average fans that will get the job done to fans with fitted heat lamps, motion sensors and heat-exchanger ventilation that helps avoid warmed air from getting out through your ventilation. While there are a lot of bells and whistles to select from, the most critical 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 standard 8-foot ceiling, your ventilation fan should have a CFM rating about 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 taller 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 easy, you can use HGTV’s guidance for bathrooms larger than 100 square feet – establish your CFM requirements by toting 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 right size, or you know it’s time for a new one, give the professionals at Klaus & Sons Heating & Air Conditioning at call at 909-982-5698. We’re here to help you make sure you have a ventilation fan that will drive hard to guard your home and keep it comfortable. You can even set up an appointment with us online if that’s the most straightforward for you.