By DC voltage and electromagnetic induction, the electrical energy into mechanical rotation so as to drive the blades, collectively referred to as "DC Fan". In simple terms, relying constantly switch coil and the IC, magnetic induction from rotating blades drive. We divided into two categories: Brushless and Brush Brush fan through continuous working life at several hundred to over 1,000 hours to reach the ultimate use carbon brushes need to be replaced, or is likely to cause wear of the bearings. Brushless Fan Continuous Life in general is ten thousand hours to count, and speed can be controlled. Pan used in the production of electronic products for adequate ventilation.