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Apprentice Q&A · #072

How do I install a retaining angle on a fire damper in a masonry wall?

2nd YearDampersRED · Stop / Verify

Position the damper sleeve centered in the wall penetration. Place the pre-formed steel retaining angles (1\frac{1}{2}\text{ in} \times 1\frac{1}{2}\text{ in} minimum) tight against the masonry surface on all four sides of the sleeve perimeter. * Fasten the angles directly to the damper sleeve using approved screws or welds spaced per manufacturer instructions. Do not anchor the angle directly into the masonry wall.

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Plain-English answer

Position the damper sleeve centered in the wall penetration. Place the pre-formed steel retaining angles (1\frac{1}{2}\text{ in} \times 1\frac{1}{2}\text{ in} minimum) tight against the masonry surface on all four sides of the sleeve perimeter. * Fasten the angles directly to the damper sleeve using approved screws or welds spaced per manufacturer instructions. Do not anchor the angle directly into the masonry wall.

Field checklist

Ask Foreman

Hey boss, I’m on dampers and need verification before I touch this: How do I install a retaining angle on a fire damper in a masonry wall? Do you want me to stop here and check the approved detail, submittal, or inspector/manufacturer requirement first?

Open 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.

Related questions

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Related Field Rescue routes

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Related mistakes & recovery checks

#074 · Forgetting to install a fire damper in a rated wall penetration2nd Year · Installation#153 · Not calibrating measuring tools (squares, protractors) at the start of a precision project4th Year · Tools & Equipment#162 · Forgetting to install access doors at every fire damper, control valve, and coil in the system4th Year · Installation