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 used to dump heat, smoke, and gases out of the structure to improve conditions inside for the attack crew. The key is doing this in a controlled, coordinated way with the interior team and water application. When suppression has begun, interior crews are already applying water to the fire, and venting at the same time helps remove confined heat and backdraft potential, making the interior environment safer and more tenable. If you vent too early, you can introduce more oxygen and drive the fire to grow; if you wait until the fire is completely out, you miss the benefit of improved visibility and reduced heat for crews still operating inside. Ventilation during the attack, aligned with the interior teams’ actions, gives the best balance of safety and effectiveness.