Features 1.This stove fan is powered by transforming heat into energy, without using any battery or electricity. 2.The range of working temperature is about: 140°F / 60°C~662°F / 350°C, higher the temperature, faster it starts to spin. Attention: the temperature can not be over 662°F when using the stove fan. 3.Can circulate heat throughtout the room. 4.This stove fan is silent and quiet.