... demands, such as Supply voltage range, No noise, hall-free, power,etc.Applications: External rotor motor, centrifugal fan, centrifugal blower, ... such as Supply voltage range, No noise, hall-free, power,etc. power,etc.Applications of External Rotor Brushless DC Motor controllor:External ... DC and EC circular duct fan, EC Gas blower, etc. High efficiency EC fan 24V brushless DC motor driver controllor