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A VAV inlet needs stable air entering the sensor area. An angled short entry can spin the air and make the box read wrong.
['A VAV box reads airflow through an internal sensor array. If the air enters at a hard angle or immediately after a short offset, the sensor can see swirl instead of a stable velocity profile.', 'Check the inlet connection, straight run, flex/round transition, and obstructions. The recovery is usually a straighter rigid inlet spool, revised offset before the straight section, or detailer/TAB-approved connection.']
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