TinnerFlow™2nd YearTDC / DuctmateGREEN · Standard Correction
A twisted flange usually means the line is hung out of square. Loosen nearby hangers, square the faces with controlled alignment, bolt it cleanly, then re-level the run.
When TDC/Ductmate corners will not line up, the problem is often the duct line, hangers, or previous joint being out of square—not the bolt hole itself.
Back off nearby hanger nuts enough to give the run controlled movement, square the flange faces, start the corner bolts without tearing holes, then re-level the hangers. If the flange is bent or the run is forced into a twist, stop before creating a permanent leak path.
Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.