Generates it's own electricity from the heat off stoves. Operates best between 500-700 degrees F I guess. Forces hot air to floor and helps evenly distribute the overall air temp in tent whatever. I saw one for 75% off and jumped on it. Can't give you a report yet but I will. Plan on using it in a ice fishing house and over wood burning stove in a small cabin that has no insulation.
Spent a week using the fan in a rat shack in northern Minnesota with lows ranging from -14 to -18 and I was very suprised how well this thing works. The shack has no insulation and a tin roof. I have in the past woken up in the bunk room reading -4 and with the fan I was finding the temp averaged around +45. This thing really works. The only neg I found was drying things out above the stove was not as fast for obvious reasons...the heat was being evenly distributed throughout the shack. YouTube- Thermoelectric fan
Yes, they work very well. Now imagine of you could get your hands on some insulation and some heat bricks for around the fireplace... Total comfort.