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Crap?ignore the crap about the variac, that is exactly what you want.
-Variable autotransformer (Variac): Produces continuous sine wave of a lower voltage (unlike a triac (crappy speed controller) which chops up the sine wave to achieve a decreased voltage) allows fan operation with no hum.
Electricity is magic.
Play with care.
Starving a fan motor of power WILL make it run slower.
It will also heat up due to inefficiencies.
I have made this mistake myself.