7 Amp at 12-Volt Dimmer Switch with 2 in. Wire Leads 1002102 - The Home Depot
Rheostat Variable Speed Control for Gas Fireplace Fan, Fan Kit, Wood Stove Fan, Fan Controller for Various Fireplace Blower Kits : Amazon.ca: Tools & Home Improvement
Switch-rheostat
Fan Rheostat Controller Switch With Knob
300W Max - 120V Rotary Dimmer Switch with Plastic Housing and 1in long shank