Can Filters 736872 Can-Trol Vari, 120V Voltage Controller This controller is all 120 volt, 60 Hz The product provides smooth sinusoidal wave. There is no growl at running speed CFG, makes available a variable transformer speed controls for: 120 Volt, 60 hertz (5 amps) 120 Volt, 60 hertz (10 amps) 240 Volt, 60 hertz (5 amps) for the 12in Max-Fan