TinnerFlow™2nd YearDuct Assembly, Seams & JointsStandard Correction
Hold-downs should secure the duct, not deform it. Back off the clamps, add approved isolation/cushioning, and re-secure without crushing the metal.
A trapeze clamp that dents the duct or flange is too tight or missing a protective pad. It can open corners, distort joints, and create noise.
Loosen the hardware, inspect the flange/corner, add approved cushion or bearing material, and tighten only enough to restrain movement without changing duct shape.
Use this as training guidance. Foreman direction, approved drawings, project specs, manufacturer instructions, employer safety policy, and AHJ/code requirements always control the final answer.