"Micro Cooling Fan" in addition to the fan section has some curvature on the outside, in the top plan also extends along the radial direction is not straight, but curved slightly toward the direction of rotation, was a certain arc. If the radially extending straight blade, rotating fan driven air vents in the side show a widely scattered, air distance is short, and "power" is not focused; if the current product version slightly curved, you can ensure that the blowing airflow focus within the columnar space in front of the outlet, increasing the air pressure and the distance. "Micro Cooling Fan" blade smoothness: This is a non-target 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, to deal with "Micro 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.