The Ecofan AirMax Model 812 produces the highest airflow over a wider range of stove surface temperatures. For use on freestanding wood stoves with a surface temperature between 185°F — 650°F (85°C — 345°C). The Ecofan Airmax is an economical way to move air throughout your living space. Creating its own electricity and pushing up to 175 CFM (cubic feet per minute) this fan is ideal for those living off the grid or looking to increase the efficiency of their stove and use less fuel. Whisper quiet and completely assembled, these fans make for a great gift. Two year warranty.