Respiratory protection filters [Safe protection against gases and particulates][Use]P3 particulate filters are respiratory protection filters that provide protection against a number of known harmful substances whose inhalation is harmful to health: toxic gases, vapours or particulates, as well as a number of compounds whose harmful effects on health are immediate or delayed. [Shelf life] Gas and combined filters, sealed and properly stored by the manufacturer, may be stored for the following periods:A, AX, B, E, K, Hg, reactor: 6 years CO, NO filters: 4 years Expiry dates are indicated on the individual filters. Opened gas and combined filters must be replaced at the latest 6 months after o