"220V Cooling Fan" transport the most important parts is bearing a long time the lack of lubricating oil, noise will occur when this speed change. Thus, we only need a few drops of lubricating oil in the fan bearings, if not using sewing machine to be replaced. "220V Cooling Fan" but do not pay attention to the use of oil instead, because of its relatively large particles, simple to bearing damage occurs. Fixed blades, noise sensation is also an important part of the fan noise, because "220V Cooling Fan" loose blade on the bearing and the bearing wear incur larger gap, and thus only need to remove the sub-sector, the screws tight button, After so firmly fixed, there will be no sensation.