Which statement about air-entrainment systems is FALSE?

The statement regarding air-entrainment systems that is falsely characterized is the one that claims the FIO2 values are directly proportional to total flow. In air-entrainment systems, the fraction of inspired oxygen (FIO2) is determined by the ratio of air to oxygen being mixed, which is dictated by the size of the entrainment ports and not by the total flow rate in a direct proportional relationship.

As total flow increases in these systems, the proportion of air and oxygen remains constant as long as the proportions of the entrainment ports are not altered. Therefore, FIO2 values will remain fixed as specified by the design of the device for given flow rates, rather than increasing proportionally with total flow. This indicates that while higher flow rates can be provided to maintain patient needs, the FIO2 is not determined in a direct proportionality to total flow but rather is fixed within a specified range based on the air-entrainment principles.

In contrast, fixed FIO2 indicates that these systems deliver a specific concentration of oxygen. The range of FIO2 being between 24-50% is characteristic of air-entrainment systems designed to deliver controlled oxygen concentrations. Lastly, it is essential that the output flow stays below