... demand,we choose the fans with lower speed, Cause lower speed,longer life span. 3.The material ... RD signal (Stall warning), FG signal(Detect fan speed value), water proof and so on. 4.ADC ... DC fan through the ADC cooling module, the wind speed of the air volume improved significantly, and ... gas pollution-free, The fan use import high-speed, thermostability ball bearings ,hundred percent guarantee non-oil ...