... 30 RHZK-6/30 RHZK-6.8/30 SCBA Equipment RHZKF series of positive-pressure air breathing apparatus ... are widely used in fire fighting, chemical industry, shipbuilding, petroleum, metallurgy, electricity, warehouses, laboratories, mines and other departments, ... ambulance personnel to the ideal of personal respiratory protection equipment. ModelCylinder Working Pressure(Mpa )Cylinder Volume(L)Max ...