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 300°C, 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 50°C to 350°C (122°F to 662°F) and the fan speed changes automatically depending on the oven temperature. The highest conversion rate is reached when the temperature reaches around 250°C to 300°C. 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