Fig. 1
From: Effect of flow and cannula size on generated pressure during nasal high flow
The graph shows the positive airway pressure, cmH2O, that is generated by nasal high flow (NHF) using a smaller cannula (O.D. 6.1 mm) and larger cannula (O.D. 7.2 mm) in “nares” with two different diameters: 10 mm (left panel) and 9 mm (right panel) in the bench top model. Pressure generated by NHF can be increased by higher flow and by occluding a larger area of the nare, which can be achieved by increasing the cannula size