What Size Should My Bathroom Ventilation Fan Be? 07/28/2017Average tasks like showering, bathing and shaving can put home-destructive humidity into the air in your Thousand Oaks home. There’s good news however—a simple bathroom ventilation fan can protect you from deformed wood, mold growth, cracked drywall and other problems 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 quiet and energy efficient as they could be? Air Max HVAC Inc is here to answer your questions. Today’s bathroom ventilation fans are small and smooth 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 leaking through your ventilation. While you have a lot of bells and whistles to choose from, the most important aspect of your fan is whether or not it’s large enough to do its job. Graded by the cubic feet per minute (CFM) of air they move, a bathroom ventilation fan should be able to replace 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. Thus, if your bathroom is 5 feet by 8 feet, a CFM rating of 40 would be adequate. 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 easy, you can heed 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 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 Air Max HVAC Inc at call at 805-217-8662. We’re here to help you guarantee you have a ventilation fan that will run hard to protect your home and keep it comfortable. You can even set up an appointment with us online if that’s the most straightforward for you.