Features: [5 Blades Design] Equipped with 5 blades, which has faster speed and larger air volume than 4 blades. [Saving Fuel] The heat active stove fan is designed to circulate the warm air created by a wood/coal or pellet-burning, efficiently circulates warm air throughout the room. [Quiet Operation] This stove fan's noise level is less than or equal to 35dB, which gives you a quiet environment. [Auto Speed Adjustment] The speed of the fan depends on the temperature of the stove. When the stove temperature is higher, the fan speed is faster. When the furnace temperature is low enough(stove fire burned out), the fan speed slows down until stops turning. [Eco-friendly&Energy-saving] No batteries or power adapter required, convenient to use, saving costs. Specification: Type: Stove fan Material: Aluminum oxide Color: Black/Gold/Red&Green(optional) Number of blade: 5 Air volume: 180-210 Wind speed: 800-1100rpm Noise: ≤35dB Working temperature: 60-350℃ Item size: 19.5 * 14 * 10cm /7.68 * 5.51 * 3.94in Item weight: Approx. 510g /17.99oz Packing list: 1 * Stove fan 1 * Thermometer