Ben Hirst Firefighter 1 Practice Exam

What is the most common type of self-contained breathing apparatus?

Closed-Circuit Open-Circuit Multi-Circuit Rebreather

Correct Answer:

Open-Circuit

Explanation:

Open-circuit SCBA is the most common type. In this setup, air is carried in a high-pressure cylinder and delivered to the facepiece through a regulator. The wearer inhales fresh air, and the exhaled gas is vented to the surrounding environment. This simple, lightweight, and reliable design is ideal for firefighting, giving predictable performance and easier maintenance in smoky, hot conditions. Since the breathing gas isn’t recycled, there’s no risk of CO2 buildup in the supply, and duration depends mainly on cylinder size and exertion. Closed-circuit systems, or rebreathers, recirculate and scrub exhaled air, which adds weight and complexity and is less common for routine firefighting. Rebreathers are more typical in diving or specialized industrial applications.

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