Preventing backdraft through vertical ventilation

Grit on Instagram: "What you’re seeing here is a critical firefighter safety technique used to prevent a deadly backdraft. A backdraft happens when a fire burns inside a sealed room and slowly consumes most of the available oxygen. The flames may appear to weaken, but inside, superheated gases and unburned fuel are still building intense pressure and heat. When a door opens, a window shatters, or a wall collapses, fresh oxygen rushes into that oxygen-starved environment. In seconds, the trapped