1. Select "220V AC Cooling Fan" Choose a good fan means choosing quality brand from the brand, so that the DC fan is important to guarantee the quality.
2. Choose from the appearance of "220V AC Cooling Fan" from the outer surface should be relatively thick overall, relatively pure colors (especially black, the color of the fan is not important), at the edge of the box leaves no burrs, watching fan the thickness of the (very important because too thin easily broken), there is not much strain when Yong Shounie frame.
3. Bearing up select "220V AC Cooling Fan" because bearings are divided into two kinds of ball bearings and oil-bearing ball bearing long life, low noise, but the price is very expensive requirements. Oil-bearing ball bearing service life is shorter than 1/3, may be some noise (over one year) in use for some time, but the price is cheap. After more understanding since we can choose, but if any ball fan and oil prices almost the price of the fan, it indicates which ball bearings or eliminated for the old product, do not buy. To push new products and the manufacturers of the bearings (except clear that the oil-bearing outer) will not exceed the life of the ball bearing, but also there is noise in the future use.