Static field route #19662

What do I do when a rectangular duct flange lip was cut too short for the S-cleat?

Rectangular Duct Assembly: S-and-Drive✅ FIELD REFERENCEField answer expansion

📖 Verified core answer

S-cleats need enough flange lip to bite. If the lip is trimmed too short, remake the end or add an approved connection fix before the joint is installed.

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Field verification checklist

Check flange lip depth around the full opening.
Test the S-cleat fit before the piece goes up.
Look for short spots caused by crooked snips.
Do not force a cleat that barely catches.
Ask whether to remake, re-edge, or use an approved alternate connection.

Ask foreman

You trimmed that connection flange lip too short—it's barely catching the edge of the S-cleat pocket. Maintain a clean half-inch flange extension on your cut lines so the joint locks together secure.

Text to foreman

Route options

A Correct prep/setup only if the fix is within your assignment and the approved method is clear.

B Hold and document if it affects safety, structural support, rated assemblies, airflow, access, tools, material condition, or another trade.

C Bring the journeyman/foreman the location, what you checked, and what decision you need before the crew loses time.

Do not do this

Do not send up a duct end that barely catches the S-cleat pocket.

Why this matters

A weak S-cleat bite can slip loose, leak, and force rework overhead.

Final verification

Use this as field training guidance. Final direction still comes from the foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, pressure/material schedule, and AHJ/code requirements.

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