Rail and Subway Tunnel Smoke/exhaust Coordination

Transit tunnel ventilation and smoke exhaust are life-safety engineered systems.

Stop if

• This is transit/tunnel smoke ventilation. What approved sequence, rated detail, and test requirements control it?

Watch out

• Do not change damper, opening, or duct routing without approved smoke-control direction.

Check

• Confirm smoke-control sequence, fan zone, rated construction, access, testing, and AHJ/transit authority requirements.

Steps

• Identify whether this is normal ductwork or a controlled/special condition.
• Confirm smoke-control sequence, fan zone, rated construction, access, testing, and AHJ/transit authority requirements.
• Get the current drawing/detail/spec/submittal before changing routing, material, access, or support.
• Bring photos, location, and what you checked to the foreman before closing or covering the work.

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