General "220V AC Cooling Fan" dispersed above the radiator with varieties: use of sliding friction sleeve bearings and ball bearings as well as the use of two kinds of rolling friction bearings mix of these three forms. Over the years many manufacturers introduced a lot of new terms in bearing technology, such as magnetic bearings, water bearing, bearing core, "220V AC Cooling Fan", etc. are also on top of the basic forms of bearings made to improve the operation of the principle or no change. Ordinary air-cooled radiator oil bearings and ball bearings are mainly used. Dual ball bearing high-end products, high-precision, high-quality, high prices, high product belonging to three. "220V AC Cooling Fan" oil-bearing satisfy various working conditions, but he is also a very long period of use, the price is relatively low, but the quality is, relatively speaking, more general.