The method is typically used for openings in a vertical surface, like doors or hallways, and where the opening is comparatively small in comparison to the size of the surface-----Opposed airflow
The opposed flow method works by exhausting smoke through permanently open, fixed openings located between smoke zones. this is often done by slowing the movement of smoke into another smoke zone by using the horizontal velocity of air
A passive smoke management system, or smoke containment system, incorporates smoke and fire-rated curtains to compartmentalize fire and smoke keeping it out of the paths of egress. Smoke containment curtains are often built right into a building's design and therefore invisible when not in use.
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