also might i add to check the amperage that the rheostat will manage. its not the volts that will cook either its the amperage that will. the motor should have its amps draw listed on a sticker somewhere on it, just get the fan rheostat that will fit the amperage and you should be fine. and if you dont know what your doing messing with electricity, let someone who does hook it up for you, some things arent worth the risk.:thumbsup: