A box of 10 FFP3 (the equivalent of N99) valved respirator masks which conform to the EN149:2001 standard. These disposable FFP3 (N99) respirator masks with exhalation valve offer effective protection against bacteria and virii including Avian Flu (H5N1), Swine Flu (H1N1) and SARS. The exhalation valve allows you to wear the mask for longer periods (8 hours max) without the discomfort of heat and moisture build up. FFP3 is the European equivalent of N99.