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Any variable can be changed based on available data. If the flow rate is 40 L/min from the CPAP, the oxygen concentrations will be higher. If leaks are present or pressure results in a higher average vent-rate, the oxygen concentrations will be lower.
=xPAP Flow Rates vs Pressure=
The following chart shows the expected flow rate for several Resmed mask models and types at different flow rates. These flow rates are for a perfect circuit without unintentional mask leaks or mouth breathing, and so are a conservative estimate of the total flow in an xPAP circuit for different types of masks. It is clear that different mask types have different expected flow rates. Nasal masks have the lowest designed leak rate, followed by nasal pillows, and finally full-face masks.
[[file:Resmed Flow vs Pressure.png]]
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