The Can-Trol Speed Controller.
Auto-Transformer,
Built in Amp meter,
Grounded Receptacle,
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.