Apprentice answer

Where should a fire damper sleeve sit in a rated wall opening

2nd YearDampers, Fire/Smoke & Life SafetyCheck first

Do not force retaining angles onto a sleeve that is too far in or out. Reposition the sleeve/damper per the manufacturer wall-opening detail so blades, sleeve, angles, and access all work.

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Plain-English answer

If the sleeve projects too far or sits too deep, the retaining angles may not seat, the damper may not sit correctly in the rated wall, and access/actuator clearances may be wrong.

The correction is to check the damper installation instructions, wall thickness, sleeve extension limits, blade location, and retaining angle requirements. Slide/reset the sleeve before firestop, drywall closure, or inspection if it is not positioned per the listed detail.

Field checklist

Check damper tag/model and manufacturer installation sheet.
Measure wall thickness, sleeve projection both sides, blade location, and retaining angle fit.
Verify actuator/linkage/access side and whether access door still works.
Check wall/sleeve gap and firestop sequence before cover.
Ask before trimming sleeve or moving a rated assembly.

Ask Foreman

The fire damper sleeve at [location] is sticking too far [side] and the retaining angles will not sit flat. I checked wall thickness and installation sheet. Do you want the sleeve reset before firestop/cover?

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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