At what flow rate does a non-rebreather mask operate?

A non-rebreather mask operates at a flow rate of 10 to 15 liters per minute (lpm) to effectively deliver high concentrations of oxygen to the patient. This flow rate is essential to ensure that the reservoir bag remains inflated, providing a continuous source of oxygen. When set at this rate, the mask can deliver up to 90% or more oxygen to the patient, which is particularly important in emergencies involving respiratory distress or hypoxia.

Higher flow rates help prevent the room air from entering the mask while the patient exhales, maintaining the concentration of oxygen as intended. A flow rate lower than 10 lpm may not keep the reservoir bag inflated and could allow for mixing of ambient air, thereby compromising the effectiveness of the non-rebreather mask in delivering the required oxygen concentration.