SCBA Self-contained breathing apparatus RHZK-5/30 RHZK-6/30 RHZK-6.8/30 SCBA Equipment RHZKF series of positive-pressure air breathing apparatus is an open-air self-contained breathing apparatus. This series of products are widely used in fire fighting, chemical industry, shipbuilding, petroleum, metallurgy, electricity, warehouses, laboratories, mines and other departments, for firefighters or ...