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Apprentice answer

Why does spiral duct drift side-to-side in teardrop hangers

2nd YearRound, Spiral & Flat Oval DuctCheck first

Loop hangers support weight but do not control lateral movement well. Add approved rigid supports or bracing to lock the run centerline.

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Plain-English answer

Teardrop/loop hangers can let high-velocity round duct drift, especially near fans, dampers, or pressure changes.

Check where the run is moving and convert selected supports to rigid trapeze, split-ring saddle, or braced support per project detail so the rods stay plumb and the pipe stays aligned.

Ask Foreman

The round duct at [location] is snaking sideways in loop hangers. I checked rod plumb and movement. Do you want rigid saddles/trapeze supports added at intervals?

Verify before acting

Use this as training guidance. Foreman direction, approved drawings, project specs, manufacturer instructions, employer safety policy, and AHJ/code requirements always control the final answer.

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