The total flow for a 50% air-entrainment mask running at 8 L/min is _____ L/min
a. 18 c. 25
b. 22 d. 30
ANS: B
100% O2 – 50% = 50%. 20% air – 50% FIO2 = 30. 30:50 = 1:1.7. For every 1 L/min of O2, there is 1.7 L/min of air being entrained. 1 + 1.7 = 2.7 ? 8 = 21.6 L/min total flow.
Health Professions
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