A safety bulletin warns about 'thermal layering' in a compartment fire: 'In a confined space, hot gases and smoke will stratify into distinct layers, with the hottest gases at the top. Interrupting this stratification, for example, by aggressive vertical ventilation without coordinated fire attack, can push superheated gases down, potentially causing flashover or firefighter injury.' What is a potential hazard of uncoordinated vertical ventilation?

Question: A safety bulletin warns about 'thermal layering' in a compartment fire: 'In a confined space, hot gases and smoke will stratify into distinct layers, with the hottest gases at the top. Interrupting this stratification, for example, by aggressive vertical ventilation without coordinated fire attack, can push superheated gases down, potentially causing flashover or firefighter injury.' What is a potential hazard of uncoordinated vertical ventilation?

Answer options:

• It will always extinguish the fire more rapidly. ✅ It can disrupt thermal layering, increasing risks to firefighters.
• It creates a safe, clear exit path immediately.
• It reduces the overall temperature within the structure without adverse effects.

Correct answer: It can disrupt thermal layering, increasing risks to firefighters.

Explanation: The bulletin explicitly states that interrupting thermal stratification through uncoordinated vertical ventilation 'can push superheated gases down, potentially causing flashover or firefighter injury,' clearly indicating an increased risk.