... mask is a essential personal poison-gas-protecting respiratory apparatus when fire happens in hotels, office buildings, department stores, banks, posts and ... eqv En403:1993=15/ 30/ 60min, poison gas and smoke protecting, fireproof, hot-radiation protecting, good sealing property ... : Carbon monoxide (CO),hydrocyanic acid(HCN), poison smoke and fog, etc. 3. Mist permeability coefficient<5%, Inhalation ...