1、Heat Powered: This is a fan that uses thermal energy as an energy source to circulate the hot air generated by the wood burning fireplace. Quiet operation, no noise. 2、Easy to Use: No plug in or battery needed, just put it on the stove, it will work when the stove temperature rises, can efficiently circulate warm indoor air. 3、Function: Put on the burning stove, it will absorb 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 the room and improving the heating efficiency of the stove. 4、Fan Speed Depends On The Temperature: The higher the temperature of the furnace, the faster the speed of the fan. When the temperature of the furnace is so low that the fire is extinguished, the speed will slow down until it stops rotating, which is safe. 5、With Thermoelectric Module: 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.