Features:1.Save Energy and Money--This stove fan runs without battery or electricity. Instead, it is powered by transforming heat into energy. There is a bimetallic strip at the bottom of the base which converts a fraction of the heat passing through it into motion. When the temperature reaches 50 centigrade, the fan starts to work.2.Self-starting and Self-regulating--Start automatically when reached its temperature of 50 centigrade (needs half or one minute to preheat). Higher the temperature, faster it starts to spin. When the temperature exceeds 370 centigrade, please take your fan away from stove. The stove fan adjusts its speed with the stove temperature. The higher temperature, the blades spin faster, and the more hot air pumps into the room. When the blades slow down, it means you should stoke the stove. Fuel costs up to 17%, no battery or power supply required, more environmentally friendly.3.Whisper Quiet and No Assembly--The blade design and no motor means the stove fan is nearly silent, able to use in a quiet room and unnoticeable against background noise such as TV. It is ready to use out of the box with no assembly. 4.Overheating Protection--When the temperature reaches 370℃, the metal shrapnel at the bottom will lift the fan to protect the fan motor from damage. Specification:Color: BlackMaterials:main unit and blades: Aluminum alloyBlade number: 4Noise: 16-18DBAir Flow:203CFMSize:As shown in the figureNet Weight: 0.78kgPower: Thermoelectric moduleOperating temperature range: 50  ℃ to 370  ℃ Note:1. Marble countertops do not conduct heat, so fireplace fans cannot be used. The fireplace and its countertop are insulated and cannot conduct heat, so fireplace fans cannot be used.2. The mesa is hollow and sparks will burn out. You can't put the fireplace fan directly on the fireplace. You should put an iron plate on it and then put the fan on it. Package Included:1 × Stove Fan