The lifespan of a cooling fan is typically determined by the type of bearing, operating environment, and maintenance. Common bearing types include ball bearings and sleeve bearings. Ball bearings have a longer lifespan, often exceeding 50,000 hours, while sleeve bearings have a shorter lifespan, usually around 20,000 to 30,000 hours. High temperatures, high humidity, and dust in the operating environment can shorten the fan's lifespan. Regular cleaning and maintenance can extend the fan's service life.