I have an outside chase that houses the pipe for my furnace and Class A pipe for my wood stove. It is a straight run in this chase with no floor penetration. Second floor is cathedral celing. A chimney installer indicated that I would need a firestop in this chase between the first/second floor and another one 8 feet up from that. My builder is saying that there is no requirement for a firestop since the chase and pipes are on the outside of the house with no floor or attic floor penetration. I live in Ulster County, NY if that makes a difference. Who is correct?