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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.

It is unlikely that a ceiling fan will fall, even if it develops a wobble. During a proper installation, ceiling fans are securely bolted to a ceiling joist, and the fasteners used for mounting are generally separate from the components related to balancing. A wobble is typically caused by an imbalance, which can be annoying and may lead to other issues, but is not usually dangerous on its own.

However, if a fan is wobbling because it was not installed correctly, it could be at risk of falling. For safety, it's always a good idea to ensure all mounting screws are tight and to address any wobbling or imbalance issues promptly.

On average, a bathroom fan lasts between five and ten years. The fan's lifespan depends on its quality, installation, and frequency of use. You can extend its life with regular cleaning and by promptly addressing any issues. Common signs that you need a new fan include mold growth, a burning smell, unusually loud noises during operation, or lingering odors in the bathroom. If your fan is no longer working as well as it once did, consider replacing it. The cost to install a new bathroom fan is typically between $240 and $550.

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.