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There’s no reason why you can’t install a ceiling fan anywhere in your home, such as in living rooms, offices, bedrooms, and dining areas. Most bathrooms already have ventilation and don’t need a ceiling fan. For safety purposes, avoid installing a ceiling fan where the blades will be less than eight feet from the floor, near bunk beds, or anywhere else they may hit nearby objects.

If you’re replacing an old fixture with a ceiling fan, you usually won’t need a permit, but if your electrician runs new wiring for the fixture, you likely will need a permit. Building permits are necessary in most municipalities if you’re making changes to your electrical system, so even if you have partial wiring run to the area and need new wiring installed for added functionality, you’ll probably need a permit. Your electrician should be able to let you know if you need one, and they’ll typically file the paperwork for you.

Fan power is measured by CFM, or cubic feet per minute. For every 1,000 feet of square footage in your attic, you need a minimum of 700 CFM. Steeper roofs may need larger fans or about 840 CFM.  You can figure the size of attic fan you need by multiplying the square footage of your attic floor by 0.7. (multiply by 1.2 for a steep roof and 1.15 for a dark roof). That number is the CFM required for your fan to run efficiently.

Keeping dust off fans can keep them working optimally and help keep dust mites or bacteria from building up. Dust fans weekly with a duster, microfiber cloth, old pillowcase, or vacuum attachment. You can also try spraying a clean fan with a store-bought dust-repellent product or making a DIY dust-repellent with water and a small amount of liquid fabric softener mixed in.