Had a sweep come out today to inspect the flue. The pipe was clean even after three full seasons of burning - thanks mostly to this site. However, he noticed and took pictures of the inner wall of the class A pipe "pealing" back and exposing the insulation layer. It's happening on the two sections we have. I believe it's secure-temp pipe. The sweep says it looks like something that happened during installation. This is based on the fact that a brush has never been through the chimney. The real kicker is that he said I shouldn't use the stove. I'm hoping to get at least a second opinion if not more. Here are the picks.