... is a essential personal poison-gas-protecting respiratory apparatus when fire happens in hotels, office buildings, department stores, banks ... of protection: Carbon monoxide (CO),hydrocyanic acid(HCN), poison smoke and fog, etc. 3. Mist permeability coefficient<5%, Inhalation ... -saving. 2.Storage conditions: 0- 40 surrounding, no fire source nearby, no flammable, explosive and corrosive material nearby., ...