Every wood or coal stove or furnace manufactured to date is not totally efficient. This means that heat which could be utilized is going up each and every chimney. The MH6 is designed to utilize a part of that lost heat and yet lets enough heat pass through the chimney so creosote and soot formation is avoided. The MH6 has a quiet dependable fan that promotes heat circulation to improve overall efficiency. Heavy-gauge outer box and heat tubes provide durability and long lasting performance.