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WD-40 in its liquid or aerosol form is highly flammable. Using it around live electrical parts, such as a bath fan, can generate fire and a dangerous condition. However, if you follow proper safety procedures, including disconnecting the power to the fan before working on it, WD-40 can help remove some of the grime that builds up in your bath fan.

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.

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. 

A small wobble isn’t worrisome, especially when you’re using your fan at top speed, but a significant one is. Ball joint fans, which are used on sloped ceilings, are more likely to wobble than a standard fan based on their design. But even then, you shouldn’t see significant wobbling, as this can be a sign of a bad installation.