1. It is a filtering gas mask that can provide effective protection for personnel's respiratory organs, eyes, and facial skin in the event of chemical, biological, and radioactive pollution. 2. (1) The anti cyanide time shall not be less than 30 minutes (30L/min, 1.5mg/L, relative humidity 80-80%). (2) The oil mist transmittance shall not exceed 0.005% (30L/min). (3) The inspiratory resistance shall not exceed 186Pa (30L/min). (4) The expiratory resistance should not exceed 300Pa (160L/min).