I have a buddy who has jotul. Brand new house brand new install. He has 7' of pipe in the house, 5' in the attic and then another 6-8' on the roof. He has a hard time getting it started. Then when he does get it started the smoke comes back in to the house. He has had the pipe inspected and it is clear. The people who installed it said that he needs to start a fire on the "shelf" to get the draw going. He has done that and it doesn't work. One time he got a fire started and it started drawing air down the pipe and he couldn't get it to go out and had to use a fire extinguisher. Does anyone have any idea why this might be happening? He has a $3000 stove just sitting there that he can't use. I am just trying to help him out and told him you guys were probably more knowledgeable than his installer!