... happened 4.Protecting time: 40&60minutes Gas Smoke Hood1. Fire escape mask, smoke hood, fire fighting mask This kind ... 40mins (for XHZLC40 ) and 60mins ( XHZLC60). Poison gas and smoke protecting, fireproof, hot-radiation protecting, good sealing property, suitable for ... of protection: Carbon monoxide (CO),hydrocyanic acid(HCN), poison smoke and fog, etc. 3. Mist permeability coefficient<5%, Inhalation ...