An O2 delivery device takes separate pressurized air and O2 sources as input, then mixes these gases through a precision valve. What does this describe?
a. O2 blending system
b. Reservoir system
c. Air-entrainment system
d. Low-flow system
ANS: A
With a blending system, separate pressurized air and O2 sources are input, and the gases are mixed either manually or with a precision valve (blender).
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