The R05 NBC ﬁlter was developed in accordance with the NATOTriptych requirements for protection against chemical warfare agents /hydrogen cyanide, cyanogen chloride, chloropicrin, sarin, phosgene etc./. The ﬁlter canister is ﬁtted with High Efﬁciency Particulate Air /HEPA/ particle ﬁlter and has a standard connection in accordance with EN 148-1 and STANAG 4155 requirements. It is intended for use with a full face mask. The R05 combined ﬁlter canister consists of a lacquered aluminium casing and plastic cover providing resistance to corrosion and impact. The main elements, the particle ﬁlter and activated carbon have been selected to provide low respiratory resistance and weight while meeting the NATO Triptych requirements as well as requirements of EN 141. Air ﬂow resistance at 30 l/min is less than 120 Pa, at 95 l/min is less than 390 Pa, with gas mask less than 490 Pa. Weight: 240 g.