Key features: Stainless steel canister with mechanical & chemical filters can filter carbon monoxide (CO) and other toxic gases. One way breathing valve is made of ABS plastic which prevents inhaling of toxic gases and is used only to exhale out. Escape Smoke Hood: (With Box) Canister to filter, Carbon Monoxide(CO), Hydrogen Cyanide(HCN), Hydrogen Chloride(HCL), Acrolien(C3H4O), FR Hood with Visor, Exhalation Valve, Flexible Neck Belt, Stainless Steel Canister, with wall mounting box.