This knob increases the noise of my fan significantly; it begins to emit a loud electrical "hum". like the hum of a fluorescent lamp, but deeper. If you want a noiseless reduction in fan speed, you need an AC voltage transformer (variac), which allows you to smoothly control the amplitude of the AC current you receive from the mains. I didn't know until I bought this machine. If you care about fan noise, skip this and just buy a CVT.
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