🔍 Key Concepts

• Standard SCBA (Self-Contained Breathing Apparatus) cylinder ratings used in maritime firefighting • Difference between cylinder "rating" in minutes and actual time in stressful vs. non-stressful conditions • Typical capacity used in basic shipboard firefighting drills

💭 Think About

• Think about what time limit your basic on‑board fire drills usually assume for one SCBA bottle before you must rotate teams or exit. • Consider whether manufacturers and training courses base their planning number on calm breathing or heavy exertion. • Ask yourself which option best matches the commonly quoted "nominal" duration for an SCBA used in classroom examples.

✅ Before You Answer

• Check which of the choices matches the standard nominal duration printed on many SCBA cylinders used in basic training, not the maximum possible with very slow breathing. • Verify that the time you pick would realistically allow a firefighter to enter, work briefly, and exit safely during a drill scenario. • Eliminate times that seem too short to be practical for entry and search, and too long to be realistic given the limited air volume of a backpack cylinder.