EdStainless Thanks for the reply. It is not a double walled tube. Is this a requirement? I haven't come across this in my research.
It is an insulated steel pipe in the interior of the building and penetrates the wall through a thimble (this is shown in the drawing but I can't tell if it is...
I have a standby diesel generator located in the basement of a building. The exhaust pipe routes through a building wall (drawings show a through-wall thimble) to the exterior below grade. It then transfers to another larger diameter pipe, continues underground, and eventually exhausts to...
