Maximize the warmth achieved from precious timber resources by boosting your woodstove's efficiency up to 30% with our innovative and whisper-quiet Ecofan UltrAir Woodstove Fan. Employing simple thermodynamic technology, the hotter your stove gets, the faster the Ecofan UltrAir fan quietly propels heat back into your living space - without using electricity. Peak performance occurs at surface temperatures of 300° - 650°F. Moves 125 cubic feet of air per minute. Made of anodized aluminum so it won't rust or corrode. An all-time Real Goods best seller - in fact, our 5,000 square foot retail store at EcoTerra Center keeps warm with one woodstove and two Ecofans on sub-freezing days in the winter!