If the "Cooling Fan Manufacturer" wind power play than as a weapon. So pressure is the weapon of sharpness. Under other conditions remain unchanged. The actual amount of wind to fan effect plays a decisive role. Higher aluminum fin cooling fan for air pressure requirements. Copper fins require large amount of wind. The more dense fin For higher pressure requirements. Otherwise, the air flow between the fins will not smooth. The thermostat "Cooling Fan Manufacturer" by the PCB to install a thermistor. Sensing temperature changes speed, the higher the temperature, the faster the fan speed. However, the cooling fan blades are singular Why? It is because you want to keep the fan running balance and reduce the impact as much as possible to bring the resonance. Singular "Cooling Fan Manufacturer" blades are the best choice in the mold is difficult to achieve double So the number of blades symmetric equilibrium point for the fans, the double is not a good thing;. "Not all good pairs."