Features: This product does not require a battery,and only needs the heat of the fireplace to make the fan rotatewhich is in line with the current concept of energy saving. The working temperature range is approximately: 60-350°C/140-662°F, the higher the temperature, the faster it starts to spin. The temperature cannot exceed 335 when using the stove fan. The function can make the whole room full of heat and feel warm. When working, the sound is extremely low and no noise. With two fan heads, the wind is , the circulation effect is better, and the heat energy is more evenly distributed. Specifications: Style: Fireplace fan Color: Black Material: Alumina Air volume: 180-210 Wind speed: 750-1050RPM Noise: 35dB Working temperature: 60-350°C/140-662°F Number of fan blades: 8 Number of fan heads: 2 Weight: About 870G/1.9lb Base size(L * W): About 103 * 75MM/4.1 * 3.0" length: About 45MM/1.8" Product size(L * H * W): About 205 * 135 * 95MM/8.1 * 5.3 *3.7" Heat Powered Stove fanhelp you save fuel and spread warmth to youEfficiently circulates warm air throughout the room without noise.