Static field route #338

What do I do when not coordinating acoustic liner with duct size?

Insulation, Liner, Vapor Barrier & Condensation.1 field-polished — insulation/rated-detail check

Acoustic liner changes inside duct size and airflow area. Verify liner thickness and duct size before installing or connecting.

Open in Field Rescue Open category

Field checklist

Check whether the duct size shown is lined size, outside metal size, or clear inside size.
Verify liner thickness at transitions, taps, dampers, and equipment.
Check for liner edges that could peel or obstruct airflow.
Ask before modifying a lined piece.

Ask foreman

This duct is lined. Is the shown size the metal size or the clear airflow size after liner?

Do not

Do not assume lined duct has the same clear opening as unlined duct.

Why it matters

Insulation affects access, vapor barrier, condensation control, inspections, TAB/service access, and finished-work quality. Project specs and manufacturer details still control.

Search words: insulation liner vapor barrier liner thickness