FiO2
• Room air = 21%
• NPO2 1L/min = 25%
• NPO2 2L/min = 29%
• NPO2 3L/min = 33%
• Simple facemask: 35 – 60%
• Venturi mask: depends on the FiO2 of the venturi nozzle
• High-flow mask: 70 – 90%
• High flow nasal cannula: 30 – 100%
*FiO2 for NPO2: 4% FiO2 added above room air for increase in every 1L/min