You may have heard or read somewhere that you should run your bathroom exhaust fan whenever you take a shower and then let it run for a while after you’re done with the shower. Showers increase the humidity in the bathroom. Sometimes it gets high enough to cause condensation to appear on the mirror and other surfaces in the bathroom. And that can result in mold growth.
So you should always run your bath fan when you shower. Or so they say.
Reasons to run the bathroom exhaust fan
Bath fans are a really nice thing to have. I know. I lived without one in my 48-year-old condo for years before finally remodeling and installing an exhaust fan two years ago. They do indeed remove moisture. I took the photo above one day last summer after intentionally leaving the fan off so I could get a good picture of condensation. (Yeah, I’m like that.)
But they also remove odors. Bathrooms have been known to be smelly on occasion. You know, with all the candles and incense and hairspray and stuff. Right? Oh, and then there’s the cleaning products. And, in some bathrooms (not mine!), a pile of dirty laundry. Seems like there’s something else, too, but anyway, you get the point. Bath fans are good for removing odors.
Another reason to run the bath fan is if it’s part of your whole-house ventilation system. You can get controls to run them continuously or a certain number of minutes per hour. Some fans have the controls built in. Either way, if the bath fan is part of your whole-house ventilation, you don’t want to turn it off in winter. (By the way, bath fans don’t have to be part of exhaust-only whole-house ventilation. You can pair them…
This article is only available to GBA Prime Members
Sign up for a free trial and get instant access to this article as well as GBA’s complete library of premium articles and construction details.
Already a member? Log in