In the selection and installation should also be considered: First, the choice of "Mini Air Cooling Fan" must be able to provide sufficient amount of exhaust (speed), under the high temperatures of the hot air inside the cooling device; when the temperature is relatively low and hot air is relatively less time to do the opposite of work. Next, the position sensor installed in the selection should be noted that the sensor in the proper position, as far as possible so that the sensor can be clamped directly to the surface to be cooled. When if "Mini Air Cooling Fan" rotor inertia physical centroid and the center of the rotor shaft axis is not the same, it will cause the rotor imbalance. The nearest distance between the rotor center of mass with the physical center of inertia of the shaft is called the eccentricity of the rotor does not cause eccentricity value, when the "Mini Air Cooling Fan" due to centrifugal force generated when the rotor is rotated and a force in the shaft mount is formed of vibration, and mechanical vibrations transmitted through the various parts of the base path.