Static field route #435

What do I do when duct run crushed by hanger/other trade?

Airflow/TAB Impacts From InstallationV136 field-polished — distinct TAB/airflow answer

A crushed duct section is an airflow restriction, not just a cosmetic dent. Stop and verify repair/replacement before startup or cover.

Field checklist

Find what crushed the duct: hanger, pipe, cable tray, storage, lift, or other trade.
Check whether the duct shape or opening area is reduced.
Photo the damage with location/grid and reference.
Check if seams, liner, insulation, or supports were affected.
Ask whether to repair, replace, or escalate before covering.

This duct is crushed/dented at [location] and may restrict airflow. Do you want repair, replacement, or a coordination fix before TAB?

Do not cover crushed duct because air “can still get through.”

Restriction increases pressure loss and can create noise, low CFM, or failed TAB.

Search words: duct crushed damaged dent restriction airflow hanger other trade