What is a common indicator of flashover in a room during a fire?

A rapid temperature increase and smoke buildup are critical indicators of flashover in a room during a fire. Flashover occurs when the heat in a confined space reaches a point where almost all combustible materials ignite simultaneously. This phenomenon is usually preceded by a marked increase in temperature, often leading to a visible buildup of thick, dark smoke. As the temperature rises, the smoke becomes increasingly indicative of the potential for flashover, as it signifies that combustible gases are accumulating and reaching their ignition points.

The smoke buildup consists of volatile gases released from burning and heated materials, which can also contribute to the rapid rise in temperature. Recognizing these signs is essential for fire fighters, as it allows them to take appropriate actions to protect themselves and others before the fire reaches this dangerous stage. Understanding these indicators is vital for effective fire response and prevention strategies.