the stove was put in by the Harmon dealers installation crew. The service men did all the measureing to the specs that the stove required prior to the actual purchase of the stove (free concelation) in terms of how much stove pipe was going to be needed and what kind of stove pipe and the clearences that the stove required, the chimney as well. That is also how the quote sheet had been developed itamizing the cost of materials and with many years exsperience being harmon dealers i know the stoves instalation is legit. it is hard to see the depth with the straight on pic that was taken, the baro metric damper cant be seen. Another pic will be taken at a different angle . i recomend anyone that is going to buy a stove that will burn wood or coal to absolutly have a pro install it for safty measures. safety comes first!!