Wood Stove Fan Heat Powered Stove Fan 4 Blades with Thermometer Fireplace Fan Silent Operation for Wood Stove/Log Burner/Fireplace Increases 90% More Warm air - Eco Friendly and Efficient

How is BRAINIAC fireplace fan working without batteries or electricity? It seems impossible, but this stove fan runs without batteries, cords or electricity. Stove fan works because heat is a form of energy. A bimetallic strip at the base of the fan converts a tiny fraction of the heat passing through it into motion. The fan spins when the temperature is reached 50°C(122°F). The hotter the base of the fan gets, the faster the fan turns, and the more air the fan circulates into the room. It will slow down and stop when the stove cools. The stove fan is designed for usage on freestanding stoves with a normal surface temperature of between 120ºF - 698ºF. Temperatures above this range may damage the fan and the electricity generating units. Stove Fan Specifications Material: Aluminum Fan Height: 7.5inch/19cm Weight: 1.5 pounds/ 600 g Min Operating Temperature: 122°F(50°C) Max Operating Temperature: 698°F(370°C) Airflow: 203CFM Package includes 1x Stove Fan 1x User Manual