The concrete guys poured a shaft out of plumb, and my duct won't drop straight. How do I adjust?

Drop a heavy surveyor's plumb bob line from the top opening of the shaft down to the bottom floor level to map out the exact location and depth dimensions of the concrete encroachment. Fabricate a series of custom, gradual, long-length Ogee (OG) offset duct fittings to shepherd your vertical duct riser run smoothly around the out-of-plumb concrete wall projections. Ensure you maintain your code-required minimum perimeter clearance widths inside the shaft track.

["Drop a heavy surveyor's plumb bob line from the top opening of the shaft down to the bottom floor level to map out the exact location and depth dimensions of the concrete encroachment. Fabricate a series of custom, gradual, long-length Ogee (OG) offset duct fittings to shepherd your vertical duct riser run smoothly around the out-of-plumb concrete wall projections. Ensure you maintain your code-required minimum perimeter clearance widths inside the shaft track."]

Stop if

• 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.

Steps

• Stop and verify the approved detail, manufacturer instructions, foreman direction, and project specs before touching it.
• Drop a heavy surveyor's plumb bob line from the top opening of the shaft down to the bottom floor level to map out the exact location and depth dimensions of the concrete encroachment....

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