Practical and economical: no power supply or battery. Powered by heat. Practical and economical! - Wood-burning fan for stoves, powered by the heat from your fireplace, wood-burning stove or pellet stove. Use the heat from your wood burner efficiently and disperse it throughout your room. The fan circulates hot air at a rate of 270 CFM (cubic feet per minute) and uses 28% less wood. You can enjoy the warmth in your room and increase your comfort and save your bill. Automatic: The fan starts working when the surface temperature of the fireplace under the fan is around 50°C at 350°C. The higher the oven temperature, the faster the blades spin. Slide and stop when the oven is cooled (optimum range: 50-350°C). Protection function: With the increase in temperature, the iron sheet will gradually increase the fan will protect against damage due to high temperature. If the surface temperature exceeds approximately 250°C, it gently lifts the front of the fan to protect the TEG and motor. The