Brand new Harman Accentra 52i seems to be burning dirty. I completely cleaned the stove last weekend, and again yesterday. This is what it looked like yesterday, after only 5 bags of pellets: Ash is very clumpy Lots of black ash or soot on the door The stove was installed by a Harman dealer. I noticed visible smoke from the chimney today so I decided to go up and see what they did up there. I have an outside air kit which they ran all the way to the top, as well as the exhaust. I'm thinking I may have found some problems: 1) The exhaust fitting is a 3" fitting, which means there is a restriction at the end of the 25' long 4" stainless steel liner. 2) The fitting terminates only about 1" below the slate chimney cap, further restricting the exhaust. 3) The outside air liner was run all the way to this cap as well, but due to the slate chimney cap, the air that it's sucking in likely contains a lot of exhaust. Thoughts?