[Working principle]: No battery or power supply is required. The thermoelectric wood stove fan converts the heat of the stove into electric energy. There is a thermal module on the fan. The generator set converts heat into kinetic energy to drive the motor. Then the blades rotate and hot air circulates, filling the room for warmth.[Space saving]: This fireplace fan is easy to remove and install, and can be fixed on the wood/combustion furnace/fireplace wall pipe to heat, rotate and blow the hot air above the fireplace to the living room area. The slope is stable, saving space and preventing children from touching.[Features]: The normal surface temperature is between 50 C and 350 C. The optimum working temperature is 200-300C, the air volume is 160-210, the wind speed is 1200rpm, and it does not 350 C (920F). These temperatures can damage the fan and the generator set.[Silent operation]: The fan runs at 35dB, which is quiet and will not interrupt your reading, work and other activities. You can enjoy warm air in a quiet and comfortable environment and the circulation of indoor hot air.size: 135 x 135 x 160mmMaterial: Metalcolour: BlackPackage Contents:1 x wood stove fan1 x Stove ThermometerOnly the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real . The measurement allowed is +/- 1-3cm.