What about the Cooling Fan Manufacturer blade shape

"Cooling Fan Manufacturer" have sickle, trapezoidal and AVC patent folding edge type. Relatively speaking, sickle blades when quiet operation is relatively stable, but also less pressure can be generated; trapezoidal blades prone to greater pressure, but the noise is large. Fold edge type is the best design, while maintaining low noise can have a greater pressure, but only for the AVC own products. Currently we prove that more is sickle design.
"Cooling Fan Manufacturer" Design Excellence blades, can produce an output greater air volume and pressure in the fan speed is not high, but it does not produce too much wind noise. Apart from the shape of the blade pitch angle is also important to meet the needs of the motor characteristics and the heat sink design. Otherwise, the simple pursuit of "Cooling Fan Manufacturer" blade inclination big, big wind wind noise may appear small.