Thanks for the input guys. Not there yet, but looking forward to getting a roaster installed in a new site, I am looking for the right contractors to handle it. I know I will need to be the responsible party for the material and code requirements. Is the 15k degree straight pipe you referred to readily available from the HVAC supply houses, or is there a specialty marketplace for it? Thanks for the help. Oh, and can you explain the nomenclature of 15k degree straight pipe? As in, 15000 degree? That would seem like a lot! And can there be no bends in the pipe on its way out the building?