Characteristics: This is a fan that uses thermal energy as an energy source to circulate the hot air produced by a wood fireplace.There is a thermoelectric module on the fan, which acts as a small generator to drive the fan motor. When this generator module experiences a thermal difference between the upper and lower surfaces, it produces an electric current.The bottom fan heats the bottom of the module, while the top of the module is kept cool by the upper fan fins. No batteries or power supply are required, that is, as long as it is placed on a wood stove, it absorbs heat to turn the fan, blowing warm air above the hearthwood burner directly into the living room, increasing the interior air circulation space and improving the heating efficiency of the stove. The fan speed varies depending on the temperature of the wood stove.The higher the oven temperature, the faster the speed.When the oven temperature is so low that the fire is out, slow down until it stops. Product advantages: To save fuel, the fan dissipates heat from the stove to improve energy efficiency;Self-generation - unplugged or unplugged to connect to battery;Quiet operation;Automatic start, speed regulation, stop;Simple and elegant design.