What is the primary purpose of smoke control systems that use opposed air flow in open floor plan buildings?

What is the primary purpose of smoke control systems that use opposed air flow in open floor plan buildings?

• A. Keep smoke from migrating into unaffected areas.
• B. Dilute the contaminants.
• C. Collect smoke at its highest point in a large space.
• D. Maximize the movement of smoke from one building to another.

Answer: (A)

In spaces with open floor plans, smoke can spread quickly because there aren’t many barriers to stop it. Smoke control systems that use opposed air flow create two opposing air movements to establish a pressure boundary. By delivering fresh air into protected areas while drawing air out of the same or surrounding spaces, these systems push smoke away from areas that occupants rely on for safe egress and keep it from migrating into unaffected zones. This approach focuses on maintaining safer, smoke-free zones and directing smoke toward exhaust paths rather than simply diluting it or collecting it in a single high point. Making the bulk of smoke stay out of protected spaces is the primary goal, not increasing cross-building smoke movement.