Get matched with top bathroom fan installation pros in Blanding, UT

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.

Most ceiling fans have a lifespan of anywhere from five to 15 years or 10 years on average. Just how long your ceiling fan lasts depends on the quality of the parts, how much it’s used, and how well you maintain it. A fan with a weak motor that runs on the medium setting nonstop is likely to have a shorter lifespan compared to a fan with a powerful motor that runs on the slowest setting for air circulation.

The number of blades for your fan poses both advantages and disadvantages. Typically, the more blades on a fan, the better the air distribution and cooling effect, but this also means that your fan will have more wear on its motor. For small rooms, three-blade fans should work fine. For larger areas like living rooms, four or five-blade fans might be the better option. 

It depends on your budget and cooling needs. Whole-house fans keep your home breezy by pulling in cool air and pushing out hot air. In places with milder climates, they can replace air conditioning. On the other hand, Attic fans focus on keeping your attic cool—not your entire house. Often, whole-house fans cost more than attic fans, with installation ranging from $600 to $3,600.