Originally Posted by n981ms
Maybe someone with a pulse oximeter could test nasal cannula vs mask with nasal cannula in it as described above.
I suspect it will work better than nasal cannula alone.
I've got a PO. I've been trying to think of a suitable ground and flight test.
Take PO reading without mask
Put mask on, turn on O2, Take PO readings a (?) intervals.
If that's safe then I would take it up to (?) feet and run the same test.