TinnerFlow™2nd YearDuct LinerGREEN · Standard Correction
Loose or proud liner pins can catch dirt and let liner lift in the airstream. Flatten/secure them and repair liner facing per approved liner adhesive/spec before inspection closeout.
Internal acoustic liner has to stay tight to the duct wall. If grip pins or heads stick proud into the airstream, they can catch lint/dust and create a spot where liner starts tearing loose.
Reach the area safely, flatten/secure the pin heads as allowed, repair damaged liner facing with approved adhesive/coating, and verify no loose insulation remains in the air path. Replace badly damaged liner sections if needed.
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.