The fan works without batteries, cords or electricity and is environmentally friendly. It generates energy thanks to the heat given off by the surface of the stove. The base of the fan transmits heat to the power-generating units, and the power-generating units convert thermal energy into kinetic energy. The energy to drive the motor, then the blades spin.Upgrade 4 blades and blow hot air throughout the room. Simply place the fan on a flat, smooth surface on top of your stove, near the side or back of the stovepipe. You must place the fan at least 4 inches from the stovepipe. It will work when the stove surface is hot.Operating temperature: 40-340 (644F): The fan turns when the temperature reaches 40C. The hotter the base of the fan is , the faster the fan spins, the more the fan circulates in the room. It will slow down and stop as the stove cools.Anodized Aluminum Material: The fan is made of anodized aluminum, which will not rust or corrode if the fan overheats. A bimetallic safety device is installed at the base of the fan. If the surface temperature exceeds 300C, the safety device gently lifts the front of the fan to protect the TEG and the motor.Quiet working, more airflow. The Fan Features With the unique blade design, the oven fan can conduct more hot air with quiet operation. No noise. You will enjoy warm air in a calm and comfortable environment.