Description: 1. Heat Powered This log burner fan doesn't require batteries or electricity, it not needs extra energy, just only needs heat to turn, which is not only environmentally friendly, but also saves you money, so if you have a wood stove, you can't miss it! 2. Easy to operate The wood stove fan doesn’t need assembly, you just need to put the stove fan on the surface of the stovetop, the fan will automatically rotate with the temperature getting higher. The hotter the stovetop is, the faster the stove fan spins and the more warm air the eco fan circulates. 3. Operating temperature The working temperature of this wood stove fan is 85-350°C. It starts spinning when the temperature gets around 55°C, and works most efficiently when it gets around 200-300°C. But please avoid to use the fan at high temperature continuously for a long time. Kindly note the working efficiency will be various as per your stovetop temperature. 4. Overheating Protection This stove fan comes with a bi-metallic safety device at the bottom. When the surface temperature rises around 250-300°C, it will gently lift the front of the fan to protect the TEG and motor. The fan will automatically recover normally as the surface temperature decreases. 5. Whisper and quiet The noise level of the fan is less than 25dB, the only moving part is the blades, which makes the wood stove fan almost totally silent even at top speed.You even do not know the stove fan is there, but you will still feel a breeze, but not wind from your fan. Specification: Blade number: 4 Dimension: 16×10.5×19.2cm (L/W/H) Weight: 523g Noise: ≤25dB Working temperature: 176-653°F(80°C-345°C) Material: Aluminum Color: Black