Should round duct through a block wall have a sleeve

Plain-English answer

Running thin duct skin directly through a rough block wall may look fine on day one, but vibration and sharp masonry edges can wear holes, damage coatings, and create leaks.

The recovery is to verify the wall type/rating and install a proper sleeve or protection detail before final seal/trim. The gap treatment depends on whether the wall is rated, exterior, acoustic, smoke, or ordinary partition.

Field 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

Verify before acting

Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.

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