Static field route #19095

What do I do when a firewall core hole is out of round and pinches a fire damper sleeve?

Fire/Smoke Dampers, Access Doors & Rated Assemblies⚠️ CHECK BEFORE YOU FIXV191 answer-gap expansion

📖 Verified core answer

A fire damper sleeve cannot be forced into a pinched opening. The sleeve/frame must sit without binding so the damper can operate and the rated assembly can be finished correctly.

Open in Field Rescue Open category

Field verification checklist

Test-fit without hammering the sleeve into the wall.
Look for sleeve distortion, frame bind, or rubbed/tight concrete points.
Check manufacturer damper instructions and approved wall assembly detail.
Mark tight spots for concrete correction/grinding by the responsible trade.
Verify damper blade operation before final retaining angles/firestop.

Ask foreman

The firewall core at [location] is out of round and pinching the fire damper sleeve. I checked for sleeve bind. Do you want the opening corrected before we set the damper?

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 drive a fire damper sleeve into a tight rated opening and hope the damper still drops.

Why this matters

A bound sleeve can stop a life-safety damper from operating and can fail inspection.

Final verification

Use this as field training guidance. Final direction still comes from the foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements.

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