The Caframo Ecofan 810 is a heat-powered fan desiogned to circulate the warm air created by a wood-stove operating with normal surface temperatures of between 100C and 345C. The UltrAir 810 Ecofan generates up to 125 cubic feet (of air) per minute. (At 100C the Ultrair Ecofan 810 will move 50 CFM)