HDF Series Emergency Escape Breathing Device: Durayion :more than 15min Air Cylinder Volume:3L Normal Working Pressure:210Bar Emergency Escape Breathing Device: Durayion :≥15minAir Cylinder Volume :3LNormal Working Pressure:210BarWeight:7kgPacking Size :590*250*175mmCertificate:CCS,EC Mainly used in the condition of fire,heavy smoke,poison gas or less oxygen area.