Long unbraced hanger rods can let equipment swing, rattle, and transfer vibration. Check support, isolation, and lateral/seismic bracing before the ceiling closes.
This [fan/unit] is swinging on long rods when it runs. I checked rods, isolation, duct pull, and bracing. Do you want approved lateral/seismic bracing added or the support layout revised before ceiling cover?
Watch out
Do not rely on rigid ductwork, flex duct, ceiling grid, or nearby pipe to stop equipment from swinging.
Check
Confirm what is moving: rods, unit, duct, flex connector, or ceiling grid.
Check rod length, anchor points, vibration isolation, and whether ductwork is pulling on the unit.
Look for missing lateral/seismic bracing or bracing installed in the wrong direction.
Check manufacturer/project support requirements for the equipment.
Document the movement during startup if safe to do so.
Steps
Confirm what is moving: rods, unit, duct, flex connector, or ceiling grid.
Check rod length, anchor points, vibration isolation, and whether ductwork is pulling on the unit.
Look for missing lateral/seismic bracing or bracing installed in the wrong direction.
Check manufacturer/project support requirements for the equipment.
Document the movement during startup if safe to do so.
Say this to your foreman
This [fan/unit] is swinging on long rods when it runs. I checked rods, isolation, duct pull, and bracing. Do you want approved lateral/seismic bracing added or the support layout revised before ceiling cover?