Hi, I'm getting things together to install a Harman tl200 in my basement. The chimney already exists and has a 6" thimble that is only 12" below the floor joists (from the top of the thimble). I'll be using double walled stove pipe. I'd like to so this as safely and efficiently as possible and have a question: Assuming the measurements all work out, is there any reason I can't come out of the stove with a 45 degree elbow and then come out of the thimble with a 45 degree elbow and joint the two with a straight pipe? This seems like the best solution to me looking at it for a few reasons. First, it will actually move the pipe 14" from the nearest joist and 22" from the next one. A horizontal run that would be 12" from two joists. It also seems like it would flow better. Is there anything I'm missing? Thanks in advance.