The RHZK series self-contained open-circuit compressed air breathing apparatus are used widely for fir-fighting, chemical industry, shipping, laboratory, mine, petroleum, warehouse, factory and metallurgy. It can provide effetely respiratory protecting from toxic gases for fire-fighter, life-saver, rescuer and operator who working in thick smoke, steam and oxygen deficiency hazardous atmosphere..   The product was awarded the certificate of ,inspection by state quality testing center for fire-fighting equipment and it is up to the China Standard of GA124《Self-Contained Open-circuit Compressed Air Breathing Apparatus for Fire-fighting》. The breathing apparatus for shipping was authorized by the China Classification Society of Shipping.(Provision of CCS, EC certificate)