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"A silicon diode has a small forward drop, but you would have to series a whole string of them to get an appreciable slowing of the fan."
John,
I did not know this. I was thinking of the heat the resistors may build up. I guess that one could use 2 - 10 ohms for the 1st speed (voltage) reduction, and then 3-4 of them for the second slower speed for a low noise, low speed fan.
Do you see any problems with this idea. I think only one speed reduction on the stove vent fan is all that is needed.
TIA,
Steve
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