Abstract: A control method for fan includes the following steps: a temperature value for a heat element is detected by a heat detecting unit, and the temperature value is transmitted to a remote processor; a fan input controlling signal is calculated according to the temperature value; the fan input controlling signal is transmitted to a fan board directly from the remote processor; an input speed information is input to the fan for dissipating the heat element by the fan board according to the fan input controlling signal; an output speed information of the fan is received; and determining whether the fan works as predefined by the fan board according to the output speed information and the input speed information.

Abstract: A control method for fan includes the following steps: a temperature value for a heat element is detected by a heat detecting unit, and the temperature value is transmitted to an infrastructure management module; a fan input control signal is calculated according to the temperature value; the fan input control signal is transmitted to a fan board through the heat detecting unit; an input speed information is input to the fan for dissipating the heat element by the fan board according to the fan input control signal; an output speed information of the fan is received; and determining whether the fan works as predefined by the fan board according to the output speed information and the input speed information.

Abstract: A fan assembly includes a bracket, a fan and a cage. The bracket includes a ventilation plate. The fan is received in the bracket and secured to the ventilation plate. The cage is received in the bracket and secured to the fan. The cage defines an opening and includes a plurality of pieces rotatably received in the opening. The plurality of pieces cover the opening. The cage further includes a plurality of limiting pieces extending from an inner surface of the opening. The pressure of moving air from the fan is capable of rotating the plurality of pieces, but any over-rotation of the plurality of pieces is prevented by the plurality of limiting pieces.