What does flashover refer to in a fire situation?

Flashover refers to a critical phase during a fire event characterized by the rapid spread of flames throughout an enclosed space, creating a uniform and intense fire condition. In this moment, the heat generated by the fire causes combustible materials in the area to ignite almost simultaneously, leading to a sudden and dramatic increase in fire intensity. This phenomenon typically occurs when the smoke layer reaches a temperature that exceeds the ignition point of nearby materials, causing them to combust.

Understanding flashover is crucial for fire investigators and firefighters alike, as it highlights the dangers present in a burning environment. Recognizing the conditions that lead to flashover can help in assessing fire dynamics and improve safety measures during fire suppression efforts. Knowing this phase allows for better planning and response strategies to mitigate the risks associated with rapid fire spread.