Went to a church to try and get their steam boiler running. The usual story, no money, depending on volunteers, etc. They had a hot water tank put in by a friend of a friend a little while ago.
I'm not a fan of immediately reducing the flue, and it should be 4" due to the distance.
As I gaze up 15' or so into the ceiling it does this:
The pic is a little hard to see (sorry) but the pipe goes up 15' or so, elbows for a few feet, then elbows DOWN into a chimney pipe. Of course, the draft was a bit off.
They know about it, someone is coming by to turn the tee around to the bottom and rework it so it can be connected properly.