Choose excellent quality products. Because "220V Cooling Fan" industry and technology low, uneven product on the market, be sure to choose well-known brand products, so to ensure quality. Try to use the mid-range or low gear. Usually the first to open files fast, cool down more slowly with the file, you can reduce the fan power consumption. Change the way the ball bearing friction, rolling friction, this approach is more effective in reducing the friction between the bearing surface phenomenon, effectively increasing the fan bearing life, and therefore will extend the life of the radiator. The disadvantage is brought about by a more complex process, which will raise costs, it also brings higher operating noise.