![]() ![]() clean your fan’s vents at least twice a year to ensure that it’s not too dusty to pull air through properly.mop up any puddles immediately so your fan has less water to dry up.If you have a shower curtain, pull it most of the way closed, but leave it slightly open to allow for airflow around the curtain and in the shower. leave the shower door open after you exit the shower, so the fan can dry it more quickly.open the bathroom door while showering, if privacy is not an issue, or leave it open after you’re done.You can also help your bathroom fan ventilate your bathroom better if you You can also install a fan with a humidity sensor that senses when it needs to run and when it needs to turn itself off. If you’re in a hurry in the mornings and you don’t have time to leave it on that long, or you know you’ll forget to turn it off afterward, you can get a fan with a timer that shuts itself off. This give the fan time to completely dry the room. Run the fan for 20 minutes after your shower In fact with a properly installed bath fan that is used properly your mirrors should never fog up because the fan is removing the moist air before it can condense on any surface. In order for the fan to properly replace the bathroom air, it needs to be used properly.ĭon’t wait for the room to become steamy. Many people turn on the fan when the bathroom mirror begins fogging up, and turn it off when they leave the room. You can vent two fans through one roof vent. Large bathrooms of bathrooms with separate toilet rooms need multiple fans. Ideally the duct run is also straight, with no elbows or turn. Using flex duct can reduce the actaul CFM output of your bathroom ventialtion fan by 20% or more. For this reason smooth duct is recommended but often builders and remodelers use flexible duct because its easier to install. The air that runs through your duct work as it exhausts out the house is affected by the friction created by the walls of the duct. Add 10-20% to allow for the length of duct needed to vent the fan through the roof and how straight the duct run is.Add an extra 10% if you have a jetted tub, as the water’s agitation adds a lot of moisture to the air.Add in an extra 20% if you have tall ceilings (10 ft or higher).So if a bathroom requires 80 CFM we’ll usually put in a 90-100 CFM Fan. We like to oversize bathroom ventialltion because conditions are rarely ideal. But conditions are not always ideal and you need to adjust for a few other factors.Īdjust for things like ceiling Height, duct run and shower size. This is considered the minumum needed under ideal conditions. If your bathroom is 8 feet x 10 feet, you want a fan with a CFM of at least 88. How do you calculate that?Ī good rule of thumb for room with an 8 ft ceiling is to have 1.1 CFM per square foot. You should aim for a fan that provides air exchanges at least eight times per hour. ![]() This is too low to remove the steam from the room fast enough to prevent condensation, mildew and mold. In builder-grade fans, the CFM generally installed means that the bathroom fan fully exchanges the air inside the bathroom with outside air five times per hour. Unfortunately, that fan may not be powerful enough to properly ventilate your space. Even in newer homes many builders install the smallest fan allowable by code. Older homes may not have a bath exhaust fan at all. ![]()
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