My baro damper does not have a sliding adjustment, just a screw with a weight on the other end, there for just guessing at the settings
. I now have the setpoint set at 165* and the baro damper opening about 3/4 inch at a stack temp of around 250*. This seems to be working, but to soon to tell. I will keep you posted.
Other than reducing size, what is the purpose of a firebox reducer. With little heat demand (2 yr old house, outside temps in the mid 30"s) do I really need such a large bed of coal 16"x24"x6"