PLA Daily 2003-05-22

　 　This protective mask system, developed by the Army's Anti-Chemical Research Institute, consists of a full-face mask, airway pipe, air-transmitting pipe and a filter. The mask's air pressure, which is higher than that of the outside environment, can prevent the penetration of noxious air. The filtration device can effectively filter out various virus particles, including coronavirus.

　　by Zhang Zhiwei

　　(May 22, PLA Daily )