Ecofan with two blades for Wood Stoves, Black Body, Nickel Blades This fan generates its own electricity.No unsightly electric cords and no batteries to change. Just sit the fan on the top of the stove. Heat produces an electrical current. This electricity is then used to drive a DC motor and fan-blade that circulates the warm air throughout the room. As the stove gets warmer, more electricity is generated and the fan goes faster, boosting stove efficiency by up to 30%.Specifications:Airflow - 150 cfm Operating Temperature Range - 150 degree to 700 degreeOptimum Operating Temperature Range - 400 degree to 650 degree