Why should you wear a self-contained...

🔍 Key Concepts

• Enclosed space hazards: lack of oxygen, presence of toxic gases, and smoke inhalation risks • Self-contained breathing apparatus (SCBA): how it protects you from multiple atmospheric dangers, not just one • Fire behavior in confined spaces: how combustion products build up when ventilation is poor

💭 Think About

• In a closed compartment, what happens to the air as the fire continues to burn and there is little or no ventilation? • Besides oxygen being used up, what harmful substances are commonly produced by fires that can affect breathing and the brain? • Does an SCBA protect you from only one specific hazard, or from the overall unsafe atmosphere inside the compartment?

✅ Before You Answer

• Consider all the different ways the atmosphere inside a closed, burning compartment can become deadly (not just one gas). • Think about whether the safest answer focuses on a single specific effect or on the combined risks of fire gases, smoke, and oxygen depletion. • Before choosing, ask: "Would I still need SCBA if only one of these problems existed, or because any or all of them might be present?"

Why should you wear a self-contained breathing apparatus before entering a closed compartment to fight a fire?

The fire consumes oxygen which may lead to asphyxiation.

The fire produces smoke, which contains toxic gases that cause breathing difficulties and irritation of the respiratory tract.

The fire produces carbon monoxide which causes an oxygen deficiency in the brain and body, leading quickly to death.

All of the above.

🔍 Key Concepts

💭 Think About

✅ Before You Answer