This stove fan is designed to deliver a very broad thermal current which comes from the burning in fireplace or stove, so that it can quickly raise the temperature of your room, and keep your room warm.The hotter the stove, the more air the fan can circulate, and the maximum distance of hot air transmission is 3 meters/117.9inch. -The fan will only start to work when the temperature reaches 158-230 degree Fahrenheit(70-110 degrees Celsius, depending on the type of fireplace). The top of the fan is equipped with a temperature display strip. -The stove fan base and blades are made from anodized aluminum, which have good thermal conductivity and make the fan not rust or corrode, durable enough for a long time use. -The stove fan comes with a Bi-metallic safety device. When the stove surface temperature rises its maximum working temperature, the safety device gently elevates the front of the fan to protect the center module and motor. -No batteries or electricity required, the stove fan operates, automatically when the surface temp of the stove reaches 158-230 degrees Fahrenheit(depending on the type of fireplace). And the only moving part is the blade accessory, which makes the wood stove fan almost totally silent even at top speed. Notice: -Make sure that the stove fan is placed on the top of the stove on a smooth and flat surface near the side or back of the stove. The surface material of the stove must be thermally conductive. -Only when the temperature of stove surface reaches to 158-230 degrees Fahrenheit(depending on the type of fireplace) can the stove fan transmit the heat into electric energy and work. -The maximum working temperature is 653 degrees Fahrenheit(345 degree Celsius). If the temperature displayed on the strip is beyond this, please remove the stove fan from the stove in case of that accident happens. -Please use the ring to adjust and remove the fan whenever or you might get scald by its hot surface. Specifications: -Type:stove fan -Material:aluminum+electronic component -Item color:black -Quantity:1p -Operating temperature:70-345 degrees Celsius/158-653 degrees Fahrenheit -Noise: