The Caframo Ecofan 812 AirMax is a heat-powered fan desiogned to circulate the warm air created by a wood-stove operating with normal surface temperatures of between 85C and 345C. The Caframo 812 AirMax Ecofan generates up to 175 cubic feet (of air) per minute. (At 85C the AirMax Ecofan 812 will move 50CFM)