Key Benefits; 1. Compact Size： 16*12*21cm, the material of the stove fan is aluminum. 2. No Batteries or Electricity required The wood burner fan uses heat from the stove surface to spin, adjusting its speed automatically with the stove surface temperature. 3. Longer lifetime There is a Bi-metallic safety device at the base of the stove fan. If the surface temperature rises around 300℃, the safety device gently elevates the front of the fan to protect the TEG and motor. 4. Whisper-quiet The only moving part of this heat powered fan is the blade assembled. You don't even know the stove fan is there, but you will FEEL the WARMTH! 5. Less Consumption, More Efficiency The stove fan will help reduce the fuel consumption and make the room warmer quickly. Specification: Number of blades: 4 blades Weight: 654g Noise Level: ≤ 25dB Material: extrusion aluminum Optimum temperature: 482 °F (250 °C)