I don't think it has ever run properly There are two 90º turns, a 2' horiz. section dumping into a large (10" x 10"?) cavity. All of this at about a mile above sea level.I guess I missed the part we’re he only had 3’ of masonry chimney.
I wonder how well that stove would even draft with only 11’ of total run and a good 90 degree bend?