[gas_dr]

The inspired oxygen content of air is 21%. Not 95%. And a mask does not change that. There is no such thing as an SpO2 oxygen intake.

[PIF]

The inspired oxygen content of air is 21%. Not 95%. And a mask does not change that. There is no such thing as an SpO2 oxygen intake.

—
then you are at odds with the medical profession, and dead wrong.