Automatic start and upgrade technology, faster speed and greater air volume. Driven by heat generated by wood, etc. or particle combustion furnace. It can bring greater comfort and reduce the wood used in the stove by 28%.1X fan + English manualPackage size: 21.2x12.5x18cmSafety design. The furnace support is treated with anodic aluminum oxide, which will not deform or change color even if it works for a long time at high temperature.New fireplace fan, thermal power fireplace fan, meticulous workmanship, quality first!The environment-friendly self powered, thermoelectric module is used as a small generator to drive the motor of the fan. No battery or power required!Product size: 19x11x16cmLonger service life, the fan base is equipped with bimetallic safety device, which will gradually lift the front of the fan to protect TEG and motor.