When selecting "220V AC Cooling Fan", mostly only concerned with current-voltage power, wind speed, the speed of these common noise parameters, the parameters of the fan asked very little, generally just ask the number of the next blade. However, the parameters of the blades on the "220V AC Cooling Fan" in the amount of wind noise wind speed, etc., have a significant impact. Chassis cabinets, inverter and other machines with cooling fan shape of the structure, in a variety of brands are relatively fixed, but in computer accessories, small toys and other fields, "220V AC Cooling Fan" of the fan shape, appearance of the structure is varied a. These sorts of shapes for the cooling effect of what role it played.