Round duct runs through a rough CMU wall without a sleeve

Raw masonry can chew into duct over time. Use an approved sleeve/trim/firestop/acoustical detail so the duct does not rub concrete and the penetration can be sealed correctly.

Cutting, Holes, Penetrations & Field Fab 2nd Year YELLOW

Watch out

Do not let raw duct rub directly on rough masonry and just caulk the outside face.

Check

Confirm wall type: CMU, rated wall, exterior wall, shaft wall, or ordinary partition.
Check whether duct is touching raw concrete/masonry edges.
Verify sleeve, annular space, firestop/acoustical seal, and trim requirements.
Inspect for vibration/contact risk and coating damage.
Coordinate with masonry/firestop/GC before closing the wall.

Steps

Confirm wall type: CMU, rated wall, exterior wall, shaft wall, or ordinary partition.
Check whether duct is touching raw concrete/masonry edges.
Verify sleeve, annular space, firestop/acoustical seal, and trim requirements.
Inspect for vibration/contact risk and coating damage.
Coordinate with masonry/firestop/GC before closing the wall.

Say this to your foreman

This round duct passes through rough CMU at [location] with no sleeve/protection. I checked wall type and contact points. Do you want a sleeve and approved perimeter seal/trim detail installed before closeout?

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