The 812 Series Ecofan is a heat powered fan designed to circulate the warm air created by a wood-stove operating with normal surface temperatures of between 65°C and 345°C. The optimal running temperature of the wood-stove Ecofan is the same as the recommended safe operating temperature for wood-stoves of between 205°C and 345°C. The Ecofan generates it`s own electricity – so no need for batteries or mains power.Increased Efficiency and Comfort: Warm air is circulated directly into the living area rather than having most of the stoves heat rise immediately to the ceiling, thereby increasing the heating efficiency of your stove. Improved warm air circulation results in greater comfort and less fuel consumption. Many people use the Ecofan to to help combat dry air. This can be done by positioning the Ecofan behind a tray of water on top of the stove to boost the rate of evaporation.Fuel Saving: Testing carried out in collaboration with a leading Canadian university has proven that using an Ecofan results in fuel savings of up to 14%.Easy Operation: The Ecofan starts automatically and adjusts its speed with the stove temperature. As the stove heats up, the Ecofan runs faster to move more warm air into the room. As the stove burns down and cools, the Ecofan automatically shuts off.Size: Base 121x82mm (4.75 x 3.25″) – Height 248mm (9.75″) excludes handle. The Ecofan 812 generates up to 150 Cubic feet (of air) per minute.