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 d12 755* 460* 290 RHZK 6/ 30 30 6 1800 50-60 4-6 d14 755* 460* 290 RHZK 6.8/ 30 30 6.8 2040 50-60 4-6 2040 50-60 4-6 d10 755* 460* 290