Automatic speed controller Description: It does not require batteries ani electricity-the fan uses heat from the surface to automatically adjust the speed to the surface temperature. Large, increased efficiency with less fuel, quiet operation. Reduced consumption, increased efficiency - Reduce fuel consumption and heat up your room quickly. Wood fan — the only moving part is the blade assembly. Say goodbye to the terrible noise. Fireplace fan material-made of high-strength aluminum alloy, which makes the fan not ma burr, ma a delicate and neat surface. no deformation and discoloration even after long work at high temperature. Saving and protecting the environment - The heat-powered fan is designed to circulate the warm air produced by burning wood/or pellets. Make the most of the heat from the wood and disperse it into your room and quickly heat the room, less consumption, more efficiency-reduce fuel consumption. Material: Aluminum Alloy Number: 6 Blade Diameter: 180mm CFM air volume: 180-210 Motor speed: 800-1100 rpm /min Noise: 35dB Starting temperature: 55 -75 Best working temperature: 80 -250 Maximum temperature: 350 Base: 100x80mm Height (without hand blade): 190 mm The package includes: 1 piece heat powered fan The packaging can be lekko damaged.