What is horizontal ventilation?

• A. Creating openings on the same level to allow air flow and smoke removal
• B. Releasing heat, smoke, and gases from a structure through the roof to improve conditions
• C. Sealing interior doors to prevent smoke movement
• D. Using mechanical ventilation to push air downward

Answer: (A)

Horizontal ventilation means creating openings on the same level of a burning structure to allow air to flow and smoke to be removed laterally. By opening a window or cutting a hole in an exterior wall on the fire floor, firefighters establish a path that brings in fresh air and pushes smoke and heat out at the same elevation. This improves conditions inside the room or hallway, helping with visibility and tenability for interior operations. It’s different from vertical ventilation, which vents heat and smoke upward through the roof.