The total flow for a 35% air-entrainment mask running at 10 L/min is _____ L/min
a. 43 c. 60
b. 53 d. 65
ANS: B
100% O2 – 35% FIO2 = 65%. 20% air – 35% FIO2 = 15. Ratio: 15:65 = 1:4.3. For every 1 L/min of O2, there is 4.3 L/min of air being entrained. 1 + 4.3 = 5.3 ? 10 = 53 L/min total flow.
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