Page 702 - (ISC)² CISSP Certified Information Systems Security Professional Official Study Guide
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FIGURE 10.3 The four primary stages of fire
Stage 1: The Incipient Stage At this stage, there is only air
ionization but no smoke.
Stage 2: The Smoke Stage In Stage 2, smoke is visible from the
point of ignition.
Stage 3: The Flame Stage This is when a flame can be seen with the
naked eye.
Stage 4: The Heat Stage At Stage 4, the fire is considerably further
down the timescale to the point where there is an intense heat buildup
and everything in the area burns.
