Field problem
Verify first
Verify before you commit. Cheap to catch now.
Confirm the round/spiral/oval fitting and connection before forcing or cutting: not checking exposed spiral appearance before final.
Protect exposed spiral like finish material. Dents and scratches become visible punch-list items.
In Spiral, Round & Oval Duct Install, I'm looking at: Exposed spiral appearance before final not checked. What should I verify before I cut, drill, seal, cover, move, or install?