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Leaving an exhaust fan on constantly isn’t ideal. While it helps remove moisture and odors, continuous use will lead to wear and tear, higher energy costs, and even fire risks if the motor overheats. Bathroom fans should run for 20 to 30 minutes after a shower, while kitchen exhaust fans should be used only when cooking or clearing air.

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.

Stainless steel or aluminum fans are long-lasting and have less air resistance. They are best for outdoor use as their durability helps them withstand unpleasant weather conditions. Their heavy weight requires a stronger motor, which leads to more noise than other blade materials.

Wooden fan blades are a classic, durable option. They are much quieter than metal fans and feature a wide range of styles and finishes to choose from. However, they can be damaged by moisture if not covered with plastic.

Plastic fan blades are lightweight, easy to clean, and versatile. There are various shapes and styles to choose from as plastic is easily molded and dyed. They will also deteriorate slower than other materials as they aren’t as susceptible to humidity and moisture.

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.