... 1999)a.Effective hour:Type 40≥40min,poison gas and smoke protectig,fireproof,hot-radiation protecting,good sealing property,suitable ... Object of protection:Cabon monxide(CO),hydrogen cyanide(HCN),Poison smoke and fog.c.Mist permeability coefficient 5%,d.Inhalation ... broken,you must consider that this respirator has been used and can not be used again. gas mask,fire fighting mask,fire escape mask