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I gave a friend a TEG (ThermoElectricGenerator) based fan that he places on the top of his wood-burning stove. The heat of the stove causes the unit to produce its own electricity and turn the fan moving the air around his shop. It isn't an overly expensive device, but, it really gets people looking at it trying to figure out where the batteries or wires are :2thumb:

Got the "B" unit from Lee Valley Tools .. its awesome!
 

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