1.Artificial Nose 2.sponge,humidifying paper,pp membrane 3.efficiency is 99.9% ... intake of the patients exhaled gas; 3,it can effectively filter outside the foreign body and bacterial particles; 4, to avoid ... cross-infection; 5, the filter rate: the 0 3μm in the air above the ... particulate filter rate should be greater than 99.99%; 6,15 / ...