"220V AC Cooling Fan" is a non-leaf smoothness index design factors, basically depends on the forming mold producers and post-processing technology. In addition to the design curve is not flat blades will produce turbulence in the rotation, increasing friction, reduce fan efficiency, fan performance impairment, increased operating noise. Therefore, the response "220V AC Cooling Fan" blade surface smoothness strict control, if the purchased product handling is poor, the rate of use of the follow-up examinations and other means to compensate for hand-polished. While the fan blades from the same multi-section curves based on a variety of adjustments that can be carried out also are limited within a certain range, but there are some manufacturers have made great improvements made very unique design. Because of the improved "220V AC Cooling Fan" fan designed mostly related to the frame design changes, we will combine together frame design at a later introduction.