1. "220V Cooling Fan" is not high performance, low noise, low prices, oil-bearing is the only option, but the noise may gradually increase after the short-lived, period of time, you need to do maintenance or replacement of psychological preparation.
2. "220V Cooling Fan" powerful performance, long life, price is not high, the ball is the best choice, but need to put up a large noise generated when their work.
3. Performance and noise are no special requirements, but hopefully long life, price is not high, to Fu, Hypro bearing oil bearing improved are worth considering.
4. "220V Cooling Fan" good performance, low noise, long life, so they can not make further demands on the price, as long as sufficient funds, hydraulic, and other characteristics of precision ceramic bearing technology can be included within a selected range.
5. Quiet and demanding life, magnetic bearings is the only choice, but poor performance, the price is too high.