1. If vibration "Mini Air Cooling Fan" when the rotor rotates physical centroid and center of inertia of the rotor shaft axis is not the same, it will cause the rotor imbalance. Recently physical centroid distance and the shaft center of inertia of the rotor is called the eccentricity of the rotor does not cause eccentricity not balanced, when the rotor is rotated due to the centrifugal force generated in the shaft mount and a force of vibration is formed, and the vibration is transmitted to the base path via various parts of machinery.
 2. When the wind noise "Mini Air Cooling Fan" work, since the blades to withstand periodic pulse power role of export uneven airflow, noise; on the other hand, due to the uneven distribution of pressure on the blade itself and the blade, the rotation of the surrounding gas and also forms part of the rotation noise disturbance; In addition, because the level of turbulence when gas flows through the blade attached, vortex and vortex detachment, causing the pressure distribution on the blades of the pulsating "Mini Air Cooling Fan" and vortex noise. This is due to three reasons can be integrated noise called "cut wind noise", generally a big fan air flow pressure, which cut wind noise as well.