... , soft starting, etc.Main features of Brushless DC fan motor controller driver : Supply Voltage: 12~75VDCMax power: 50WSpeed control ... No noise, hall-free, power,etc.Applications: External rotor motor, centrifugal fan, centrifugal blower, axial fan in HVAC,Tele- ... HVAC applications. Related brushless dc motor and ec fan motor with this controllers: 0-10V variable speed 12V BLDC motor driver pwm control