Static field route #19083

What do I do when round duct runs through a rough CMU wall without a sleeve?

Cutting, Holes, Penetrations & Field Fabrication🟨 CHECK FIRSTV190 answer-gap expansion

📖 Verified core answer

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.

Open in Field Rescue Open category

Field verification checklist

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.

Ask 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?

Text to foreman

Route options

AMake the field correction only if it is within your assignment and the approved method.

BHold and document the condition if the fix affects airflow, access, life safety, pressure class, rated assemblies, equipment, or another trade.

CBring the foreman/detailer the location, what you checked, and what decision you need before cover, startup, or rework.

Do not do this

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

Why this matters

Unsleeved penetrations can leak, rattle, chafe holes in duct, and fail wall/firestop requirements.

Verification basis

Approved drawings/specs, project coordination drawings, manufacturer instructions/submittals, shop standards, foreman/detailer direction, employer policy, and AHJ/code requirements.