what range of oxygen concentration does a nasal cannula provide?
A face mask can be used if you find cannulas uncomfortable but will be better suited to a stationary situation such as sitting or in bed. Nasal Cannulas . A nasal cannula allows the delivery of oxygen concentrations of between 24 to 40% at flow rates between 1 to 6LPM â making them suitable for use with most portable oxygen concentrator units. One end of the plastic tubing is equipped with curved nasal prongs which fit into the front of the nostrils, with the loop hooked over the ears and the end attached to an oxygen source. Face Masks A face mask as the name suggests fits over the face.