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Static field route #440

What do I do when damper left closed or not checked?

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

Before blaming the unit, check damper position. A closed or unknown damper can make a diffuser look dead during TAB.

Open in Field RescueOpen category

Field checklist

Ask foreman

The damper serving [room/device] appears [closed/unknown]. Are we allowed to open/adjust this, or does it need foreman/TAB/fire-damper verification?

Do not

Do not randomly open, close, or reset dampers without knowing what type they are and who controls them.

Why it matters

A simple closed damper can look like a failed unit, but rated/control dampers may have specific reset/inspection rules.

Search words: damper closed zero airflow no air diffuser tab fire damper reset