YL603 Eco-friendly Aluminum Alloy Heat Powered Stove Fan with 4 Blades for Wood Gas Pellet Stoves 1. No need of any electricity, cords or batteries. Self-powered by using the Seebeck effect. 2. Fan speed varies automatically with stove or fireplace temperature. 3. Satin anodized high efficiency blade design for greater airflow. 4. Maximize energy from the stove and reduce fuel consumption. 5. Virtually silent operation. Gently circulate heat throughout the room. 6. Built-in protection system to stop the fan overheating. 7. Cost savings. 8. Work on wood, gas or pellet stoves. Completely assembled to use, just place it on top of stove. 9. The fan operates from around 60 degree Celsius to around 350 degree Celsius, the optimum operating temperature is 250 degree Celsius. 10. The fan will operate with any stove where the surface temperature does not exceed 340 degree Celsius. Stoves exceeding this range may cause damage to the components.