Economy and environmental protectionOur stove fans do not need batteries or electricity, and use thermoelectric modules as small generators to power them. Driven by heat, the speed is automatically controlled by the maximum temperature, which reduces stove emissions and optimizes oven efficiency.Auto StartWhen the surface temperature below the fan reaches about 50 degrees Celsius (122 degrees Fahrenheit), the woodstove fans begin to operate and quickly blow hot air into the room. The higher the oven temperature, the faster the blade spins. The wood stove fan will drop and stop working when it cools. The best operating temperature range is 80-260C (176-500F)Safety protection The bottom of the stove fan is equipped with a bi-metallic strip . When the surface temperature reaches about 250 degrees Celsius, the bimetal strip gently lifts the fan and effectively protects your expensive stove fan from high temperature damage.Quiet OperationUnique design of the blade, our stove fan uses noiselessly and can bring more warm air, allowing you to enjoy warm air in a quiet and comfortable environmentQuality assurance warranty: 12 months. No need to install it, you can use it when you receive it and make your winter warmer and more comfortable