Which option correctly lists the MK 25 UBA's two consumption rates in liters per minute?

• A. 0.5 L/min and 1.0 L/min
• B. 1.3 L/min and 2 L/min
• C. 2.5 L/min and 3.0 L/min
• D. 1.0 L/min and 1.5 L/min

Answer: (B)

Gas management for the MK 25 UBA hinges on understanding two breathing gas flow rates that correspond to different effort levels. At rest or minimal effort, the unit draws about 1.3 liters per minute. During heavier effort or more active maneuvering, the demand increases to about 2 liters per minute. These two figures are used to estimate how long a given cylinder will last under varying workloads and to ensure there’s enough contingency gas. The pairing of 1.3 L/min and 2 L/min matches the two consumption rates for planning and is the correct option.