What does flashover refer to in terms of fire behavior?

Flashover refers to a critical moment in fire behavior where the temperature in a confined space rises dramatically, causing all combustible materials within that area to ignite nearly simultaneously. This phenomenon occurs when the heat from the fire, along with the radiant heat from hot gases, raises the materials to their ignition temperature. This rapid spreading of fire can happen in a matter of seconds, marking a change in the dynamics of the fire incident.

Understanding flashover is vital for firefighters, as it significantly increases both the intensity of the fire and the hazards they face. When a flashover occurs, it transforms the environment and poses an immediate threat to both occupants and responders, making knowledge of this behavior essential for effective firefighting and rescue operations.