TinnerFlow™2nd YearYELLOW · Check FirstAcoustic Liner Inside Out
The coated liner face belongs toward the air stream. If raw fiberglass faces the airflow, it can erode, shed, and fail inspection.
While pre-assembling a short horizontal return drop on the ground, you slide the internal fiberglass acoustic liner insulation blanket into the sheet metal shell with the dark, coated neoprene face pressed against the metal wall, leaving the raw yellow fiberglass exposed to the active airstream.
The coated liner face belongs toward the air stream. If raw fiberglass faces the airflow, it can erode, shed, and fail inspection. The likely recovery is to check the condition, correct prep/setup if it is within your assignment, and bring the foreman clean information before the work creates rework overhead.
Do not leave raw fiberglass exposed to active duct airflow.
Correct liner orientation protects air quality, liner durability, and inspection acceptance.
Final direction belongs to the foreman, approved drawings/specs, manufacturer instructions, pressure/material schedule, employer policy, and AHJ/code requirements.