Fireplace Fan For Wood Stove, 4 Blades, Environmentally Friendly And Efficient Features This is a fan that uses heat to generate electricity as an energy source 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 fan motor. When this generator module experiences the heat difference between the top and bottom surfaces, it generates current. 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. No battery or power supply is required In other words, as long as it is placed on the burning stove, it will absorb the heat energy to drive the fan to rotate, thereby blowing the hot air above the wood burning fireplace directly to the living area, increasing the air circulation in room and improving the heating efficiency of the stove The rotation speed of the fan varies depending on the temperature of the wood-burning stove. The higher the stove temperature, the faster the rotation speed. When the stove temperature is so low that the fire is extinguished, the rotation speed slows down until it stops. product advantages: To save fuel, the fan distributes heat from the furnace to provide better fuel efficiency; Self-generation-no plug-no battery; Quiet operation; Start by itself, adjust speed and stop; Simple and stylish design. Place the stove fan on the smooth flat surface of the stove top, near the side or back of the chimney. The furnace fan is designed for independent stove, and the surface temperature of the furnace is between 65-C 350). Temperatures above this range may damage the fan and generator set and invalidate your warranty. Specification Product name: fireplace fan Material: Alumina Air volume: 180-210 Leaves: 4 leaves Wind speed: 1100rpm Noise: 25dB Working temperature: 45-350c Battery: None OEM: applicable Product size: 130*80*120mm colour 8 colors: black, gold, silver, iron gray, scarlet, bronze, rose red, blue Contain: 1x fireplace fan 1x thermometer