The RHZK series self-cbntained open circuit compressed air bresthing apparatus are used widely for fire-fighting,chemical industry,shipping,laboratory,mine,petroleum,warehose,factory and metallurgy.It can provide effetely respiratory protecting from toxic gases for fire-fighter,life-saver,rescue and operator who working in thick smoke,steam,and oxygen deficiency hazardous atmosphere. Product Inspection Standard:Requirements of the International Code for Fire Safety Systems and GA124-2004.EC Type Examination Certificate No.54 775 - 08 Lux. Type Working Pressure(Mpa) Volume (L) Tolerance of Storing (L) Working Time (min) Warning Pressure (Mpa) Weight (Kg) Dimension (mm) RHZK 5/30 30 5 1500 40-50 4-6 ≤12 755*460*290 RHZK 6/30 30 6 1800 50-60 4-6 ≤14 755*460*290 RHZK 6.8/30 30 6.8 2040 50-60 4-6 2040 50-60 4-6 ≤10 755*460*290