Rail and Subway Tunnel Smoke/exhaust Coordination
Fire/Smoke Dampers, Rated Assemblies & Access🚨 STOP / VERIFYControlled condition
Core Answer
Transit tunnel ventilation and smoke exhaust are life-safety engineered systems.
What to Check First
- Confirm smoke-control sequence
- fan zone
- rated construction
- access
- testing
- AHJ/transit authority requirements.
Ask Foreman
This is transit/tunnel smoke ventilation. What approved sequence, rated detail, and test requirements control it?
Do Not Do This
Do not change damper, opening, or duct routing without approved smoke-control direction.
Why This Matters
smoke-control failure, inspection rejection, life-safety issue
Verify against: project smoke-control documents, NFPA/IMC where applicable, transit authority, AHJ.