Pittsburgh Lock Seam Direction

Should Pittsburgh lock point with airflow or away? Confirm before crimp.

I'm checking pittsburgh lock seam direction at [location]. I found duct with machine-formed edge needing crimping. Should Pittsburgh lock point with airflow or away? Confirm before crimp.

Rectangular Duct & Fittings 1st Year GREEN

Stop if

Hold point on pittsburgh lock seam direction: I have the location, photo, drawing/detail, and what was checked. Who should verify before this gets cut, covered, lifted, sealed, energized, or signed off?

Watch out

Don't install against airflow. Don't crimp without checking orientation.

Check

room/grid/area
photo of condition
drawing/detail
manufacturer/model if visible
what I already checked

Say this to your foreman

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