Ⅰ. Heat Powered: This heat powered fan generates power by converting heat from the stove into electricity; once the motor receives the electricity, it drives the blades to spin. No batteries or electricity are required, eco-friendly. Ⅱ. Large Air Volume: Featuring 4 blades, it can diffuse warm air throughout the whole room. Simply place the fan on the stove's flat surface, and it will work when the stove surface becomes hot. Airflow coverage is 180-230 CFM. Ⅲ. Operating Temperature: This heat stove fan's operating temperature is approximately 60°C-350°C/140°F-662°F. Usually, the fan starts spinning at about 80°C/176°F and operates most efficiently when the temperature reaches around 250°C-300°C. The hotter the stove, the faster the stove fan spins. Ⅳ. Overheat Protection Device: When the temperature exceeds 300 degrees, the metal heat insulation device at the bottom of the fan will automatically bend and tilt backward for protection. Ⅴ. Quiet Work: The moving part of this stove fan is the blades, with a noise level of 35dB. During normal operation, it is very quiet, allowing you to enjoy warmth in a quiet environment. Ⅵ. Note: 1. The maximum temperature must not exceed 350°C; otherwise, the stove fan may be damaged. 2. Please use this product with a free-standing stove, not with a built-in stove or other stoves with insulated top designs. 3. When the fan is working normally, keep children away from it. Ⅶ. Specifications: Product Type: Heat Stove Fan; Material: Alumina; Color: Black; Blade Quantity: 4 Pcs; Noise: 25dB; Motor Speed: 1100RPM; Airflow Coverage: 10/107.64 sq.ft; Operating Temperature: 50°C-350°C/122°F-662°F. Ⅷ. Package Lists: 1x Heat Powered Stove Fan; 1x User Manual.