【Automatic Mode】: The 6 blades of the fireplace fan are driven by the heat of the wood fireplace. The rotation of the fan is automatically controlled by the temperature of the bottom heating plate. The speed of the fan blade changes with the temperature. The higher the temperature of the fireplace, the faster the speed of the blades, distributing heat more efficiently and saving environmentally friendly fuel. 【HIGH-QUALITY MATERIALS】: The stove fan is made of aluminum oxide, so it will not rust, corrode, even melt or deform when it gets hot. At the center of the bottom of the fan is a unique bimetallic thermoelectric module that converts heat into electrical energy so that the blades do not need batteries or electricity to rotate. 【Ease of Use】: No installation required. The upgraded 6 blades provide more warm air into your home. When the stove surface gets hot, the fireplace fan will work. When the surface temperature of the fireplace reaches 60°C, the fan blades will start rotating