1.Artificial Nose 2.sponge,humidifying paper,pp membrane 3.efficiency is 99.9% for 0.3um Product Use: This ... to reduce the heavy intake of the patients exhaled gas; 3,it can effectively filter outside the foreign body and bacterial ... , to avoid cross-infection; 5, the filter rate: the 0 3μm in the air above the particulate filter rate should be ...