Which of the following is not a rated duration for SCBA?

The choice of 70 minutes as a non-rated duration for Self-Contained Breathing Apparatus (SCBA) materials is accurate because SCBA units typically come in standard durations that are based on industry guidelines and operational needs. The common durations for SCBA units include 30 minutes, 45 minutes, and 60 minutes, as these align well with the expected usage scenarios in firefighting and emergency situations.

Common SCBA configurations are designed to provide a consistent air supply appropriate for varying operational environments. While longer durations can be beneficial in certain situations, they are not standard for SCBA ratings. The selection and maintenance of SCBA must focus on established time frames to ensure effective performance and safety for firefighters.