A HAFOE (high air flow with oxygen enrichment) mask is set at 50%. What is the air-to-oxygen entrainment ratio?

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Quizplus · Accepted Answer

The air-to-oxygen entrainment ratio is calculated by dividing the total gas flow by the oxygen flow. A HAFOE mask delivers a mixture of high-flow air and oxygen enriched gas to the patient. If the mask is set at 50%, then the oxygen flow is half of the total flow. Therefore, the air-to-oxygen entrainment ratio would be 1.7:1. (total flow = 100%, oxygen flow = 50%, air flow = 50%, 50/30=1.7)

A HAFOE (High Air Flow with Oxygen Enrichment) Mask Is