What is the purpose of a sleeve bearing?

How long does sleeve bearing last?

Sleeve Bearing Fans Once this lubricant evaporates, the fan's life simply ends. A good quality sleeve bearing fan by Prolimatech, which has proper seals to keep the oil from vaporizing. Good sleeve bearing fans can last up to 30,000 hours (and even more in some cases) at temperatures reaching 50 degrees C.

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