What Size Should My Bathroom Ventilation Fan Be? 07/28/2017Everyday tasks like showering, bathing and shaving can put home-damaging humidity into the air in your Bloomington home. There’s good news still—a modest bathroom ventilation fan can save you from distorted wood, mold growth, damaged 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? All Seasons Heating & A/C Co is here to answer your questions. Today’s bathroom ventilation fans are small and smooth and they work 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 built-in 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 pick from, the most critical feature of your fan is whether or not it’s full-sized 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 normal 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 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 simple, you can use HGTV’s guidance for bathrooms larger than 100 square feet – verify 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 right size, or you know it’s the occasion for a new one, give the pros at All Seasons Heating & A/C Co at call at 812-332-9100. We’re here to help you guarantee you have a ventilation fan that will run hard to care for your home and keep it comfortable. You can even set up an appointment with us online if that’s simplest for you.