I saw this set up while inspecting another house
and wondered why. Steel will rust and crumble
apart and this is not the proper way to set up a
class A chimney. The UL listing on this system is
not applicable and the clearance from combustible
is in question.
I haven't see the home owner or gotten a chance
to talk to them but I am concerned for their safety.
This chimney collapsed recently as you can
see the white PVC pipe is the heating
system venting out the side of the house
the water heater still vented inside the
chimney. The flue became larger than
needed and I know that the homeowner
never had the chimney inspected.
This is just the bottom of the chimney in the
basement the rest of it was removed shortly
after. I don't if anything was ever done
since but I would recommend B-Vent going
up through the chase that this chimney
came from