Now counterfeit products have been more and more, in the purchase of "Small Cooling Fan" motor problems to the attention of a lot of these machines are powered use, so when you are choosing the product to ensure quality, so as not a security risk . Selecting "Small Cooling Fan" is to look at a random file, these are manual, product certification, wiring diagrams, etc. These should seriously examine, secondly is to see whether the deformation of the fan, when turned by hand should be brisk flexible, and not in the same position to stop. Start-up performance is an important indicator of quality "Small Cooling Fan" of the motor, when tested at a slow speed, the power supply 85% of rated voltage, fan motor should start from a standstill, and the normal operation of a motor fan from start to normal The shorter the time required for the operation, the fan motor is started, the better the performance.