... withelectronically commutated, it be used for EC centrifugal fan and axial fan with 0-10V/PWM signal control, tache output, etc ... .Specifications of EC Fan brushless dc motor controller driver ... , power,etc.Applications: External rotor motor, centrifugal fan, centrifugal blower, axial fan in HVAC,Tele-communication, refrigeration, clean room, ...