Static field route #930

What do I do when duct size reduced in field without approval?

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

Field-reducing duct size is a design/approval issue. Stop and document before a “small change” becomes a system performance problem.

Field checklist

This duct was reduced from [size] to [size] in the field at [location]. Was this approved, or should we hold it for direction?

Do not reduce duct size to fit a clash without approval.

Smaller duct can increase velocity/noise and reduce available airflow downstream.

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