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Your blower motor may make a loud sound if the bearings overheat or wear down as your system ages. You may also hear loud noises coming from your blower if it’s struggling to pull in air due to dirty or damaged ducts, closed or blocked vents, or a dirty air filter. Typically, this causes a loud whistling sound.

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.

Once you remove all standing water and puddling, you should run fans for 24 to 48 hours to remove the remaining moisture. For severe water damage, it’s a good idea to run them for three to four days to be safe. Make sure you buy or rent the proper size and number of fans for your water-damaged area.

Solar attic fans work in winter, but they serve a different purpose than they do in summer. During the colder months of the year, these fans improve air circulation within your attic, which helps remove condensation and moisture to prevent mold growth and protect your insulation and the structure of your home.