Which of the following factors determine the actual O2 provided by an air-entrainment system? 1. O2 input flow to the jet 2. Air-to-O2 ratio of the device 3. Resistance downstream from the jet

a. 2 and 3 only
b. 1 and 2 only
c. 1, 2, and 3
d. 1 and 3 only


ANS: A
The FiO2 provided by air-entrainment devices depends on two key variables: the air-to-O2 ratio and the amount of flow resistance downstream from the mixing site.

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