The ceiling plenum is too tight for the planned duct connection

Do not change the connection style just because the ceiling is tight. Verify finished ceiling height, connector clearance, pressure class, access needs, and get approval before switching to a low-profile joint or revised route.

Coordination, Clashes, Sequencing & Rework 2nd Year YELLOW

Watch out

Do not switch connector type, flatten duct, remove access, or force the joint through the plenum without approval.

Check

Measure finished ceiling height, deck/structure, sprinkler/main obstruction, and duct outside dimensions with connection hardware.
Check pressure class, sealing requirement, insulation thickness, access requirements, and shop standard.
Confirm whether TDC/TDF, Ductmate, slip/drive, flat connection, or proprietary low-profile connection is allowed on that system.
Look downstream so the fix does not block ceiling grid, access panels, fire dampers, VAV controls, or lighting.
Document the tight spot with photos and elevations.

Steps

Measure finished ceiling height, deck/structure, sprinkler/main obstruction, and duct outside dimensions with connection hardware.
Check pressure class, sealing requirement, insulation thickness, access requirements, and shop standard.
Confirm whether TDC/TDF, Ductmate, slip/drive, flat connection, or proprietary low-profile connection is allowed on that system.
Look downstream so the fix does not block ceiling grid, access panels, fire dampers, VAV controls, or lighting.
Document the tight spot with photos and elevations.

Say this to your foreman

The plenum at [location] is too tight for the planned connection. I measured the ceiling height and connector clearance. Do you want an approved low-profile joint, revised elevation, route shift, or detailer review before we install this run?

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