What do I do before installing the next rectangular duct piece?

Verify piece number/tag, size, system, airflow direction, branch/opening direction, and connection type before locking the joint.

Make the metal fit right before sealing, insulating, or moving on. S-and-drive problems usually come from alignment, seating, support, damage, or wrong connector pattern.

Rectangular Duct & Fittings 3rd Year BLUE

Stop if

Ask when the piece could be for a different area, system, orientation, or connector type.

Watch out

Do not use force, screws, tape, or mastic to hide a bad mechanical fit.

Check

Confirm piece mark, size, airflow, and connector sides
Seat the S and drive cleanly
Check corners, support, gaps, and sharp edges

Steps

Check the duct tag or piece mark.
Compare to the drawing/shop drawing.
Confirm the next connection type.
Check branch/access/damper orientation.
Ask if anything does not match before driving or sealing.

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In Rectangular Duct Assembly: S-and-Drive, I'm looking at: What do I do before installing the next rectangular duct piece? What should I verify before I cut, drill, seal, cover, move, or install?