The Can-Trol Speed Controller.
Built in Amp meter,
Illuminating ON/OFF switch,
This high quality Auto-Transformer type control is the answer for mastery over your airflow. By providing a smooth sinusoidal wave to your fan it eliminates any motor hum and unnecessary strain on the motor.
This is the recommended control to use with your 12" Max-Fan.
Fans should not be reduced more than 50%, this allows for airflow to cool the motor
Item Number: 136132
Universal Product Code: 840470002162
Manufacturer: CF-Group Inc
Manufacturer's Part Number: HGC736872
Brand: Can Fan