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. 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. "220V Cooling Fan" 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. 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. "220V Cooling Fan" Quiet and demanding life, magnetic bearings is the only choice, but poor performance, the price is too high. I think we looked at these later going to sell the fan when it will "merit" of the bar.