Ultra-Air 810 Wood-Stove Ecofan. Black / Silver Fan. The Calframo Ultra-Air Ecofan 810 is a heat-powered fan designed to circulate the warm air created by a wood burning stove operating with normal surface temperatures of between 100°C and 345°C. The Ultra-Air 810 Ecofan generates up to 125 Cubic Feet (of air) per minute. (At 100°C […]