Noise is increasingly focused on a lot of players, for the "220V Cooling Fan" is the noise come from the fan. A little bit of difference between the blade and will not cause a big impact, but to know that in fact the tiny vacuum region may be the biggest source of noise, many manufacturers are in the upper and lower blades no small effort, mainly through some fancy small reformed to achieve better mute diversion effect. The main purpose is to increase the opening or diversion line on "220V Cooling Fan" Ye order to reduce the airflow caused by the "220V Cooling Fan" Ye shock. Of course, to reduce vibration, noise will be decreased, the air will flow more smoothly in accordance with a predetermined flow, achieve better cooling effect.