TinnerFlow™4th YearGrease DuctRED · Stop / Verify
Hot welded duct can move. If supports are locking it rigid with no movement path, stop and get an approved support/expansion detail before hangers, welds, or structure get damaged.
Grease duct near heavy kitchen equipment can expand as temperature rises. If the run is locked tight with rigid clamps or hard anchors in the wrong places, the metal may bow, push, crack supports, or stress welds.
This is not a casual apprentice adjustment. Check the engineered support layout, expansion provisions, vertical risers, shaft constraints, fire wrap clearance, and hanger type. Likely recovery involves sliding supports, expansion joint/detail, or revised anchoring by the foreman/detailer/engineer.
Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.