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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.

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. 

Never add oil unless the fan is specifically designed for it. Most modern ceiling fans are designed with sealed bearings that don’t require oiling. However, some older fans may have oil ports for lubrication. If your fan is older and you hear squeaking or grinding, check the manual or the manufacturer’s website to see if oiling is recommended.

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.