Static field route #443

What do I do when duct leakage before diffuser reduces delivered air?

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

A leak before the diffuser means the room never gets all the air. Seal the leak path before TAB treats it like a balancing problem.

Field checklist

I found air leaking before the diffuser at [location]. Do you want this sealed/repaired before TAB continues?

Do not ignore branch leaks because the diffuser is close by.

Any air leaking above ceiling is air not delivered to the room.

Search words: duct leakage before diffuser leak branch flex collar low cfm