TinnerFlow™2nd YearFire/Smoke DampersYELLOW · Check 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.
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.
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.