1. Choose Select brand means choosing a good quality fan from the "Micro Cooling Fan" brand, so that the DC fan is an important quality assurance.
2. Choose from the "Micro Cooling Fan" appearance from the outside surface should be considered as relatively thick, the color is pure (especially black, the color of the fans is not important), at the edge of the box leaves no edges, see blades Thickness (very important since too thin easily broken), there is no significant deformation when Yong Shounie frame.
3. "Micro Cooling Fan" bearing up choice 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 life is shorter than 1/3 of the ball bearing 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 the price of some ball fan and fan almost the price of oil, it indicates which ball is old or out of goods do not buy. New products and push for the manufacturers of the bearings (except clear that the oil-bearing outer) will not exceed the life of the ball, and there will be noise in the future use.