This is a fan that circulates the hot air produced by a wood-burning fireplace using thermal power as an energy source. There is a thermoelectric module on the fan, which acts as a small generator to drive the fan motor. When this generator module experiences a thermal difference between the top and bottom surfaces, it produces electrical current. bottom ofThe fan heats the underside of the module, while the top of the module is kept cool by the fan's top fins.No battery or power supply requiredThat is, as long as it is placed on a burning stove, it will absorb thermal energy to driveThe fan rotates to blow hot air above the wood-burning fireplace directly into the living area, increasing indoor air circulationroom and improve furnace heating efficiencyThe speed of the fan varies according to the temperature of the wood-burning stove. The higher the furnace temperature, the faster the speed. When the furnace temperature is so low that the fire is extinguished, the speed is slowed down until it stops. Product advantages: To save fuel, fans dissipate heat away from the stove for better fuel efficiency; Self-generating - do not plug in or connect to the battery;silent operation;Self-start, speed regulation, stop; Simple and stylish design.Place the stove fan on the smooth surface of the stove top, near the side or back of the chimney.The furnace fan is specially designed for independent stoves, and the surface temperature of the furnace is between65-C 350). Temperatures above this range can damage the fan and generator set and void your warranty. Specification Product Name: Fireplace Fan Material: Alumina Air volume: 180-210 Leaves: 5 leaves Wind speed: 1100rpm Noise: 35dB Working temperature: 60-350c Battery: noneInclude:1x fireplace fan