Protect damper access and rated assembly requirements: not checking wall/floor rating before penetration.
High-risk starter answer - stop before covering, blocking, fastening, modifying, insulating, or closing anything around a fire/smoke damper, ceiling radiation damper, access door, or rated assembly. A rated wall, floor, or shaft penetration is a life-safety assembly, not just a hole that duct passes through.
Ask when access is missing/blocked, damper type is unclear, rated construction is involved, or manufacturer/AHJ detail is not known.
Watch out
Do not treat damper or rated-assembly work like normal duct. Do not enlarge, patch, cover, or seal rated penetrations without the approved repair/detail.
Check
Confirm the damper type and exact location.
Find the access side, label, actuator, fusible link, sleeve, blade area, or inspection point.
Check that permanent access remains reachable after walls, ceiling, insulation, hangers, and other trades are installed.
Verify the rated assembly detail, opening size, sleeve/firestop repair responsibility, and inspection requirement before continuing.
Steps
Identify damper type and label.
Find access side, actuator/handle, and blade path.
Check whether duct, insulation, ceiling, or another trade blocks access.
Focus on the actual issue: not checking wall/floor rating before penetration.
Photograph or mark the condition if someone else needs to approve it.
Say this to your foreman
In Fire/Smoke Dampers, Access Doors & Rated Assemblies, I'm looking at: Wall/floor rating before penetration not checked. What should I verify before I cut, drill, seal, cover, move, or install?