Static field route #578

What do I do when there is a gap at the S-lock corner?

Rectangular Duct Assembly: S-and-DrivePolished core starter — shop/detail check

Correct the fit-up first. A corner gap usually means the S/slip is not seated, the duct is out of square, or the drive/corner is misaligned.

Open in Field Rescue Open category

Field checklist

Re-seat the S side
Check the corner gap
Verify the duct is not twisted or carrying weight

Ask foreman

In Rectangular Duct Assembly: S-and-Drive, I’m looking at: What do I do when there is a gap at the S-lock corner? What should I verify before I cut, drill, seal, cover, move, or install?

Do not

Do not seal or cover a joint that is only partly seated.

Why it matters

Shop standard, project drawings/specs, duct pressure class, foreman direction, and approved connection detail.

Search words: corner gap, S-lock gap, leakage, mechanical fit