Who has right-of-way when a pipe is already in the duct path

Plain-English answer

A pipe installed through a duct route is a coordination problem. Large duct is usually harder to reroute than small pipe, but that does not mean you get to smash, flatten, or detour the duct on your own.

The right move is to document the conflict clearly: trade, system, size, grid, elevation, direction, and whether it was shown on the latest coordinated set. Then the foreman/detailer/super can decide whether the pipe moves, the duct changes, an RFI is needed, or a new detail gets issued.

Field checklist

• Identify the blocking system: plumbing, waste, domestic water, sprinkler, conduit, cable tray, or structure.
• Record grid, room, elevation, duct size, pipe size, and direction of conflict.
• Check latest coordination/shop drawings, RFIs, addenda, and ceiling height constraints.
• Take photos from wide view and close-up with reference marks.
• Hold the section if the fix affects airflow, access, rated assemblies, ceiling height, or another trade.

Ask Foreman

Verify before acting

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.

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