VFT130144 Manual Variable Speed Control
The VFT130144 Manual variable speed control allows you to set the amount or air delivery desired by simply turning a knob. It is rated for
10 amp max current and is 120V only.

MSC-4 Manual Variable Speed Control
Great flexibility offering high amp capacity for multiple fan operation
The MSC-4 is an electronic manual speed control which allows the speed to be adjusted in ventilation and heat exchanger equipment to optimize the performance of this equipment. Dual Voltage (115/230V), 12.5 amp.