Verify before making a permanent change: penetration sleeve size not verified.
High-risk starter answer - stop before cutting, drilling, coring, sleeving, enlarging, patching, or relocating any opening. Sleeves need to be confirmed before the hole is made, not guessed after the wall/deck is opened.
Ask when the cut affects structure, roof, rated wall, damper/access, grease/industrial duct, equipment, or another trade.
Watch out
Do not cut because the duct does not fit.
Check
Confirm the exact location from approved drawings and field marks.
Check what is above, below, behind, or inside the cut.
Verify whether the wall/deck/roof/shaft/beam is structural, rated, waterproofed, post-tensioned, or shared with other trades.
Verify sleeve size/location, who provides it, firestop/waterproofing needs, and whether it must be installed before pour/cover.
Steps
Confirm what you are cutting/drilling/fabricating.
Check latest drawing/shop detail.
Look for hidden utilities, structure, rated assemblies, roof membrane, or equipment parts.
Focus on the actual issue: penetration sleeve size not verified.
Photograph or mark the condition if someone else needs to approve it.
Say this to your foreman
In Cutting, Holes, Penetrations & Field Fabrication, I'm looking at: Penetration sleeve size not verified. What should I verify before I cut, drill, seal, cover, move, or install?