What does the term "flashover" refer to in firefighting?

The term "flashover" specifically refers to the sudden ignition of all combustible materials in a confined space when they reach their ignition temperature, resulting in a rapid spread of fire throughout that area. This phenomenon occurs when heat is trapped within the space, causing temperatures to rise significantly. It is critical in firefighting to recognize the signs of potential flashover because it dramatically increases the fire's intensity and can endanger both occupants and firefighters.

Flashover represents a pivotal moment in a fire's progression, often transforming a tenuous situation into one of extreme danger. Understanding this term helps firefighters assess risks during firefighting operations and implement strategies to prevent reaching that point, aiding in their safety as well as that of the public.