Nano 95 with valve respiratory mask
Nano 95 with valve masks are similar to FFP2 and N95 masks in terms of efficiency and pressure drop. These masks contain a nanofiber layer between the layers of their protective spun bond. These masks have the efficiency of 95% for 0.3 microns particles and pressure drop of 55 Pascal (also known as breathability).
The figure below shows the efficiency and pressure drop of nano95 with valve masks.