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Apprentice answer

Why are thin hanger straps slicing into round duct

2nd YearRound, Spiral & Flat Oval DuctCheck first

Narrow sharp straps can damage round duct skin. Replace them with approved heavier/wider support or saddles that spread the load.

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Plain-English answer

If a strap acts like a knife edge under a round pipe, the support is damaging the material it is supposed to carry.

Check strap gauge/width, duct size, insulation, vibration, and pressure class. Recovery may be heavy-gauge banding, lined saddle, split ring, trapeze cradle, or other approved support.

Ask Foreman

The hanger straps at [location] are cutting into the round duct skin. I checked the contact points. Do you want approved saddles/heavier bands installed and the damaged skin repaired?

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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