Thanx Bob, I talked to a hearthstone dealer yeterday, and told him about the outside MB chimney. He also thinks that I have too much flue outside. Mine goes through the wall then up about 8-10'. He suggested putting vermiculite in between the flex pipe, and the MB pipe, insulating the flex line, and it may draft better. He said it "could" work. If not, I'd have to go through the roof, someting I was trying to avoid. I'll post the results of the insulation fix. Happy new year!