In which stage of the burning process does flameover occur?

Flameover occurs during the explosive growth stage of the burning process. This stage is characterized by a rapid increase in heat release rate, often resulting from the accumulation of flammable gases that have been produced during the initial stages of combustion. When these gases reach their ignition temperature, they ignite, leading to a large and sudden release of energy.

This explosive growth is typically fueled by the presence of ample oxygen and an accumulation of combustible materials in the fire environment. It often results in a dramatic change in the fire, where flames can spread quickly and unpredictably, posing significant hazards to fire responders and anyone in the vicinity. Understanding this stage is crucial for firefighters as it informs their tactics on scene, particularly concerning ventilation and suppression efforts, to mitigate the risks associated with a rapidly expanding fire.