Noise is increasingly focused on a lot of players, for the fans who are the noise from the fan. A little bit of difference between the fan 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. "220V Cooling Fan" or increase the diversion opening lines on the blades, the main purpose is to reduce the vibrations caused by the fan air flow. Of course, it reduces vibration, noise will be decreased, the air will flow more smoothly in accordance with a predetermined flow, achieve better cooling effect.