MFRI Firefighter I Test 2025 – 400 Free Practice Questions to Pass the Exam

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What is the fire behavior phenomenon known as "backdraft"?

An explosion caused by gas accumulation in open air

An explosive ignition of gases in a structure when oxygen is introduced, typically after ventilation

The phenomenon known as "backdraft" refers to an explosive ignition of accumulated gases within a structure that occurs when fresh oxygen is introduced, typically following a ventilation tactic. In situations where a fire has been smoldering and depleting the available oxygen, combustible gases can accumulate to a volatile level. When a door or window is opened—allowing oxygen to flow into the fire environment—this sudden influx can ignite the trapped gases, leading to a rapid and dangerous fire reaction, often resulting in an explosive force. Understanding this behavior is crucial for firefighting tactics, as it emphasizes the dangers associated with ventilation and the importance of controlling oxygen supply during a fire response to prevent such occurrences.

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A slow burning process without flames

A technique to cool down hazardous areas

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