Features: *2 In 1 Heat Powered Stove Fan Energy-saving 4 Leaves For Wood Burner Fireplace *Automatic Start: Faster speed, greater air volume. The thermodynamic stove fan is designed to circulate warm air from wood/coal or pellet burners with a normal surface temperature of 80 ° C to 400 ° C. *Eco-friendly and Self-powered: no battery or electricity required *Improved hot air circulation for greater comfort and a 28% reduction in stove wood use *Safe Design: the furnace support is is treated with anodized aluminum, high temperature resistance up to 752 °F (400 °C) Specifications: *Material: Anodized Aluminum Oxide *Starting temperature: 60 ° C (122 ° F) *Maximum operating temperature: 400 ° C (750 ° F) *AirFlow: 150-180 CFM (cubic feet per minute) *Noise: