I recently bought a Morso 3450 which I'm pretty pleased with. One thing I curious about is the fact that it only has one damper. Growing up all the stoves my parents ever had had a "intake" damper and a flue damper to keep all the heat from flying up the chimney. The installer said that the Morso stoves are desigend to not need a flue damper and indeed I see a "draft reducer" in the parts diagram. Does anyone know how this works?