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Mistake & recovery · #056

Making a 45-degree offset without correctly calculating the setback distance

2nd YearFabrication

Use the formula: setback = offset distance x 1.414 for a true 45. Sketch the offset geometry before bending. A wrong setback means the duct won't connect…

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Safer field move

Use the formula: setback = offset distance x 1.414 for a true 45. Sketch the offset geometry before bending. A wrong setback means the duct won't connect to its endpoints without forcing.

Ask Foreman

Can you verify this before I keep going? I’m looking at: Making a 45-degree offset without correctly calculating the setback distance. What’s the approved correction for this job?

Do not

Do not hide, force, cover, or “make it work” if this affects safety, access, airflow, rated assemblies, supports, equipment, or inspection. Stop and verify the approved correction.

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