What is the minimum flow rate for a Simple Face Mask to effectively clear CO2?

The minimum flow rate for a Simple Face Mask to effectively clear carbon dioxide (CO2) is 6 liters per minute. This flow rate is essential to ensure that adequate volumes of fresh oxygen are delivered while also helping to flush out exhaled carbon dioxide from the mask.

At lower flow rates, such as 4 or 5 liters per minute, the mask may become rebreathing prone, allowing CO2 to accumulate. This can lead to inadequate ventilation and potential respiratory acidosis, particularly in patients who are already compromised. A flow rate of 6 liters per minute provides sufficient positive pressure to prevent CO2 retention while delivering a higher concentration of oxygen to the patient. This rate is generally recommended in clinical protocols to maintain effective ventilation and oxygenation in patients requiring supplemental oxygen.