This kind of mask is heavily used in hospital and clinics that have patients who are possible carrier of highly contagious diseases or viruses to protect the medical staff who will treat the disease or the virus. This is a Niosh approved face mask which means that the center for disease control had certified this particular product as having the efficiency the same as the standards by which 3M N95 face masks are being tested. The filtration efficiency of this mask is >95%~98%

San Huei N95