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You should generally avoid using WD-40 on a ceiling fan. While it might quiet a squeak temporarily, it is primarily an anti-corrosion and water displacement agent, not a true lubricant, and can damage the fan's components over time. Most modern ceiling fans have sealed bearings and do not require oiling, so a squeak may indicate another issue. For fans that do require lubrication, it is better to use a light machine oil, 30-weight motor oil, or a lubricant specifically designed for ceiling fans.

The lifespan of an attic fan depends on the type. Passive fans can last 40 to 50 years, while electric and solar models typically last 10 to 15 years. You can extend the life of your fan with regular maintenance, such as cleaning the fan blades and shutters and checking for moisture. For professional service, you can consult a local attic fan installer or have an HVAC technician clean, oil, and inspect the unit for potential issues.

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.

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.