Oh, help!

[Jeff Eastman]

........

[Martin lehman]

Except for the fire stop that is out of place and the insulation too close to the flue pipe, all looks fine to me.

[Martin lehman]

Oh, I see. That would be the chase/roof intersection? Firestop not required that I know of. That is kind of strange.

[Michael Stockland]

Looks to me that the metal collar was too small to span the opening so they rotated it enough to nail into the roof trusses. This looks to be a collar used simply to maintain clearance from the combustible wood. I've been a HVAC installer for the past 12 years.