"Small Cooling Fan" bearing up to the manufacturers to tell you about DC blower noise solution. We know there are a lot of electronic products will generate noise, especially in industrial equipment, and many will have. Noise is a sound harmful to our health, which we have to solve the problem. But POOKIN far, has not completely eliminate the noise approach. "Small Cooling Fan" is basically a noise source dipole nature. Further to be launched, the noise is due to the blades on the fan effect on air flow through the veins caused power. Fans may think there are two discrete frequency noise source, a field with the pressure caused by the movement of the rotor blade propeller noise, and the other is caused by aerodynamic interference "Small Cooling Fan" blade noise pulse power. Wind maneuver, quiet distance between the blades is an important factor interference noise.