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 deburring sharp spiral cut.
Make the cut clean before assembly. Crooked cuts and burrs fight the connection and leave sharp edges.
In Spiral, Round & Oval Duct Install, I'm looking at: Not deburring sharp spiral cut. What should I verify before I cut, drill, seal, cover, move, or install?