THE DEVELOPMENT OF A ROOM FIRE IN 5 STAGES
Incipient Stage: This is the first stage in the fire growth process, typically created by an outside heating source, such as an open flame or smoldering materials.
Growth stage: During this stage, the fire grows fast or slow, depending on the fuel load present, type of combustion and availability of oxygen.
Flashover stage: This is a transitional stage that takes place between the growth and fully developed stages. Flashover is a phenomenon created by thermal instabilities within the room.
Fully developed stage: During this stage the fire has reached its maximum potential and is only limited by the availability of oxygen.
Decay stage: During this final stage the fuel load and oxygen decreases and the gases and temperatures begin to cool. The fire will begin to put itself out if left alone and no more oxygen is introduced in to the room.