Fireplace Fan with Thermometer and Heat Circulation Quiet Wood Fan with 6 Blades -Fireplace fan works without batteries and power supply. It generates energy from the heat emitted by the chimney. -The fan module is made of anodized aluminum to prevent rusting and corrosion in case of overheating of the fan. -Equipped with bimetallic protection device, if the surface temperature exceeds 300C, the protection device will gently raise the front of the fan to protect the TEG and motor. -This oven fan runs quietly. You will enjoy the warm air in a quiet and comfortable environment. -The operating temperature is about 50C to 350C (122F to 662F) and the fan speed changes automatically depending on the oven temperature. The highest conversion rate is reached when the temperature reaches around 250C to 300C. Specification: Model: XZ136 Material: aluminium Color: Black Size: 19*7,5*21,5 cm/7,84*2,95*8,46 inch Basic Size: 11*5.4cm/4.33*2.13 inch Fan blade diameter: 16,5 cm/6,5 inch Operating temperature range: 122 to 662 (50 to 350) Unit of air volume: 180-220 Power supply: thermoelectric module Noise: 25dB Operating temperature range: 122 to 662 (50 to 350) Speed: 1400 rpm /min The package contains: 1x fireplace fan 1x thermometer 1x screwdriver 1x User Manual