The NuTone 57W versatile Speed Wall Control for Ventilation Fans a 120-volt, 3-amp capacity. single-gang box for most usual applications. telephone dial economic policy knob for versatile selection of speed and reasoned level advantageous on/off action so you can superior the punctilious ventilation level you need. inbuilt radio noise for unpretentious operation. For with all Broan fans within Amp rating except ceiling paddle fans. Do not with impedance burglarproof motor.