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 chimney under the fan is about 50C to 350C. The higher the oven temperature, the faster the blades spin. Slide and stop when the oven is cool (optimal range: 50-350C). Protection function: With the increase in temperature, the iron sheet will gradually increase the fan will protect against high temperature damage. If the surface temperature exceeds approximately 250C, it gently lifts the front of the fan to protect the TEG and motor. The fan recovers automatically when the surface temperature decreases. This ensures user safety and prevents improper use, which increases the life of the fan. Small and exquisite: This fan is a mini model that can save a little space for your home. Unique blade design: runs quietly, more airflow. With the unique blade design, the stove fan can conduct more hot air with quiet operation. No noise. You will enjoy warm air in a calm and comfortable environment.