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Room air is 21% oxygen.

For every liter of oxygen delivered by nasal cannula add 4% for example:

1L= 24%

2L=28%

3L=32% and so on.

Yes, its right but the formula of Lpm to FiO2 is:

lpm*4+20 = FiO2

Example:

1L*4+20 = 24%

2L*4+20 = 28%

3L*4+20 = 32% and so on.

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