A hard elbow at the VAV inlet can make the airflow sensor read dirty, uneven air. Check the VAV manufacturer/install detail and bring options like a straight spool, box shift, or approved inlet fitting before TAB/startup.
Check how much straight duct is actually available before the inlet.
Look for an elbow, transition, flex, damper, or offset right at the sensor.
Check ceiling/access constraints before moving the box.
Document the condition before TAB/startup so the issue is not blamed on controls only.
Say this to your foreman
VAV [tag] has a hard elbow right at the inlet. I checked the tag and available straight length. Do you want me to add a straight spool, shift the box, use an approved inlet fitting, or hold for detailer/TAB direction?