Im new too this so humor me, my understanding of the damper was to cut the draft created by the heat differential between the fire box and the chimney cap. This is why most coal stoves require a baro damper, it acts as a safty. I would think that in a had fired unit you would want to set your baro draft to open above a certain level depending on how hot you wish to fire the box, and leave it closed at all other times. Adjustment of the draft should be done by opening and closing the air inlets on the stove. I also dont understand why you would have a manual and a baro intalled in the same unit What am i missing ???