"220V Cooling Fan" Common practices in accordance with the type of fan blade shape classification, because the shape of the blades of the fan can be most directly determine the performance characteristics. Usually divided into thin blade angle, thick and thin angled corners, a little far-fetched can put turbo "220V Cooling Fan" said to be another fan type. Thin blades Cartesian product is the earliest, but it is still not out of date. Using this fan blades can behave neatly in noise, air pressure, wind, and other aspects of life, "220V Cooling Fan" for those with lower calorific value, low frequency CPU.