This is a fan that uses thermal energy to generate electricity as energy to circulate the hot air generated by the wood burning fireplace. There is a thermoelectric module on the fan, which acts as a small generator to drive the motor of the fan. The current is generated when the generator module experiences the thermal difference between the top and bottom surfaces. The bottom of the fan heats the bottom surface of the module, while the top of the module is kept cool by the top heat sink of the fan. As long as it is placed on the burning stove, it will absorb heat energy to drive the fan to rotate, so as to directly blow the hot air above the wood burning fireplace to the living area, increase the air circulation in the room, and improve the heating efficiency of the stove The rotation speed of the fan depends on the temperature of the wood burning furnace. The higher the temperature of the furnace, the faster the rotation speed. When the furnace temperature is low enough to extinguish the fire, the rotation speed will slow down until it stops. No assembly required, just place this small stove fan on a smooth flat surface of your stovetop, the fan will automatically rotate with the temperature getting higher. The hotter the stovetop is, the faster the stove fan spins and the more warm air the eco fan circulates. Material: alumina Color:Red Air volume: 180-210 Blade: 6 Wind speed: 800-1100rpm