What is vertical ventilation and when should it be used?

• A. Vertical ventilation exhausts heat and smoke through roof openings and should be used when it improves tenability and does not spread fire to unexposed areas.
• B. Vertical ventilation is the process of exhausting air through windows at ground level and should be used in all fires.
• C. Vertical ventilation cools the building by drawing air from the street.
• D. Vertical ventilation is never used in high-rise buildings.

Answer: (A)

Vertical ventilation means removing heat and smoke from a burning building by creating an opening in the roof, so hot gases rise and escape to the outside. This method reduces temperatures inside, improves visibility, and makes the environment safer for occupants and firefighters.

It should be used when it will improve tenability—for example by lowering heat and smoke levels—and when opening the roof won’t push fire into areas that aren’t involved or expose more people to danger. In practice, this is done in coordination with an exterior or interior attack line and only when the roof can be accessed safely and the building’s structure can handle the operation.

Ground-level or window ventilation is a different approach and can have different effects on fire behavior, which is why it isn’t described as vertical ventilation. Vertical ventilation is also applicable in high-rise buildings when properly planned and coordinated, not something that’s never used.