Defensive Strip Ventilation is typically implemented to connect which walls?

• A. Usually connects opposing exterior walls
• B. Connects interior partitions
• C. Connects roof and floor
• D. Connects adjacent rooms

Answer: (A)

Defensive strip ventilation is about creating a long, continuous opening that runs along the exterior of the building. The goal is to establish a direct vent path from inside to outside, which is achieved by connecting opposing exterior walls. This allows smoke and heat to escape the structure and helps control the fire while defense teams work from the outside.

Why this setup works: a strip that spans from one exterior wall to the opposite exterior wall provides an unobstructed route for air to move through the building, pulling heat and smoke out and reducing backflow into other areas. This exterior-focused vent path is essential when interior access is unsafe or limited, and it differs from methods that would open up connections between interior spaces, or between roof and floor, or between adjacent rooms, which do not create the necessary external venting path.