When is vertical ventilation typically performed?

When is vertical ventilation typically performed?

• A. After fire suppression has begun and ventilation is needed to improve visibility and reduce heat; coordinated with interior teams.
• B. Before any suppression is started.
• C. Only after the fire is completely out.
• D. During the initial size-up before any action.

Answer: (A)

Vertical ventilation is done after suppression has started because removing smoke and heat at that point helps interior crews see and move more safely while the fire is being knocked down. Once water is applied and the fire is being controlled, opening a roof vent provides a controlled exit for hot gases and smoke, which lowers heat around the attack teams and improves visibility for search and rescue and line advancement. Coordinating this with the interior teams is essential so they’re ready to advance or adjust when the vent is opened, preventing an unintended air supply that could drive the fire or endanger crews. Ventilation too early can fuel the fire or push heat back into the structure, and waiting until the fire is completely out defeats the tactical benefit of improving conditions during suppression.

Vertical ventilation is done after suppression has started because removing smoke and heat at that point helps interior crews see and move more safely while the fire is being knocked down. Once water is applied and the fire is being controlled, opening a roof vent provides a controlled exit for hot gases and smoke, which lowers heat around the attack teams and improves visibility for search and rescue and line advancement. Coordinating this with the interior teams is essential so they’re ready to advance or adjust when the vent is opened, preventing an unintended air supply that could drive the fire or endanger crews. Ventilation too early can fuel the fire or push heat back into the structure, and waiting until the fire is completely out defeats the tactical benefit of improving conditions during suppression.