What is the preferred method for ventilating a large building?

The preferred method for ventilating a large building is individual ventilation of interior compartments. This approach focuses on managing smoke and heat within specific areas of the structure rather than attempting to ventilate the entire building at once. By targeting individual compartments, firefighters can effectively control the spread of smoke, improve visibility, and create a safer environment for occupants and responders.

In large buildings, smoke can quickly migrate and accumulate in various compartments, making it crucial to isolate and ventilate these areas effectively. By using individual ventilation techniques, such as opening windows or doors in targeted locations, the airflow can be directed more precisely, enhancing the overall efficiency of the ventilation process. This method also helps in minimizing the potential for backdrafts and flashovers, which can occur when large volumes of smoke and heat are introduced into a well-ventilated space without due consideration for the dynamics of fire behavior.

In contrast, other methods such as trench cuts or multiple roof openings may not provide the same level of precision and control, potentially leading to challenges in managing smoke and heat distribution effectively. Existing vertical shafts can also serve as ventilation points, but they may not always align well with the specific fire conditions present. Therefore, individual ventilation of interior compartments is often considered the most strategic and effective approach