Horizontal ventilation is venting through openings in walls or doors to release smoke.

Horizontal ventilation is venting through openings in walls or doors to release smoke.

• A. Opening the roof vents
• B. Vent-ing through openings in walls or doors to release smoke.
• C. Deploying water streams
• D. Using positive pressure inside

Answer: (B)

Horizontal ventilation is the act of venting smoke through openings in walls or doors to release it to the outside, rather than pushing smoke upward through the roof. This method creates a lateral pathway for hot gases to escape, which can improve interior conditions by reducing heat, increasing visibility, and making it safer for occupants and firefighters. It’s often used when roof access is difficult or when you want to influence smoke movement on a specific level without venting vertically. In practice, responders may use a fan or other means to help push or pull air through those openings to guide smoke out of the structure.

Horizontal ventilation is the act of venting smoke through openings in walls or doors to release it to the outside, rather than pushing smoke upward through the roof. This method creates a lateral pathway for hot gases to escape, which can improve interior conditions by reducing heat, increasing visibility, and making it safer for occupants and firefighters. It’s often used when roof access is difficult or when you want to influence smoke movement on a specific level without venting vertically. In practice, responders may use a fan or other means to help push or pull air through those openings to guide smoke out of the structure.