Apprentice Q&A · #131

How do I measure an offset when the duct has to drop 14 inches and move over 22 inches?

3rd YearField Math & MeasuringYELLOW · Check First

Treat the shift as a right triangle layout. The vertical drop is your Rise (14 inches) and the side-to-side shift is your Run (22 inches).

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Plain-English answer

Treat the shift as a right triangle layout. The vertical drop is your Rise (14 inches) and the side-to-side shift is your Run (22 inches).

Calculate the true center-line diagonal length of the fitting using the Pythagorean theorem (A 2 +B 2 =C 2 ).

Diagonal Length= 14 2 +22 2

= 196+484

= 680

≈26.08 inches Provide the shop layout tech with the absolute Rise, Run, and the face-to-face Length available to ensure the transition pieces line up perfectly.

Field checklist

Treat the shift as a right triangle layout. The vertical drop is your Rise (14 inches) and the side-to-side shift is your Run (22 inches).
Calculate the true center-line diagonal length of the fitting using the Pythagorean theorem (A 2 +B 2 =C 2 ).
≈26.08 inches Provide the shop layout tech with the absolute Rise, Run, and the face-to-face Length available to ensure the transition pieces line up perfectly.

Ask Foreman

Hey boss, I’m checking field math & measuring: How do I measure an offset when the duct has to drop 14 inches and move over 22 inches? I found the likely issue and want to verify the next step before I lock it in. Do you want me to adjust it now or check the drawing/detail first?

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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.

How do I measure an offset when the duct has to drop 14 inches and move over 22 inches?

Plain-English answer

Field checklist

Ask Foreman

Verify before acting

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