Caframo® 812AMXBX Ecofan® AirMax Heat Powered Stove Fan, Black, 175 CFMEcofan AirMax is a heat powered wood stove fan that creates its own electricity from the heat of the stove, increasing your comfort. Produces the highest airflow over a wider range of stove surface temperatures. For use on freestanding wood stoves with a surface temperature between 185 degree Fahrenheit 650 degree Fahrenheit (85 degree Celsius 345 degree Celsius). The Ecofan Airmax is an economical way to move air throughout your living space.