instant operation: powered directly by heat, the fan does not require any battery power supply! As soon as the heater temperature reaches 50C, the fan will start automatically and turn off on its own whenThe stove has cooled. A thermometer is included to help you monitor the temperature of the chimney. distribute hot air: our chimney fan helps you ventilate and brew hot air throughout the room instead of letting it rise to the ceiling in a corner. This better distribution of hot air allows you to better enjoy theWarmth in your room. high quality: our fan is made of anodized aluminum. The blades are wear-resistant and has good thermal conductivity. It will not deform and oxidize even if used at high temperature for a long time. space saving: this fan can be attached directly to the chimney pipe/wood stove/fireplace without taking up additional space. It will fix stably and will not be bulky. Ideal for rounded stoves or without orLittle flat surface. quiet without noise: the new 6-blade design not only has a larger air volume, but also makes less noise with a nuisance of less than 35 dB. You can enjoy the warm air in a quiet and comfortable environment.