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product speed is refers to the number of the fan blade rotation per minute, the unit is the RPM. Fan speed by the motor coil number of turns, working voltage, the number of the fan blade, Angle and height, diameter, and bearing system common decision. Speed and quality of the fan not necessarily linked. The speed of the fan can be internal speed signal measurement, but can be by external measurements.
the relevant recommendation: cooling fans at http:///products- 细节。 asp吗? cpid = 112