For use on freestanding wood stoves with a surface temperature between 150 degrees farenheit - 650 degrees farenheit (65 degrees celcius - 345 degrees celcius). The Ecofan Airmax is an economical way to move air throughout your living space. Creating its own electricity and pushing up to 150 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. 2 Nickel Blades. One year warranty.