This product series is called self-powered open pattern breathing apparatus whichcan keep the firefighters and ambulance men from noxious gas, smog and harmfulpollutant suspending in the air. It can be used in anoxic environment as well. This series of products meet the standard of GA124-2004 positive pressure firefightingbreathing apparatus and the product standard of self-supporting breathingapparatus. This series of products have already achieved the certificate of special typeof labor protection products' safe mark which is awarded by the Special Type ofLabor Protection Products Safe Mark Administration Center. Certificate number isLA-2007-0627. Mark number is 07-21-204001.The onepiece pressure gauge and alarm whistle can be put on the chest so that cylinderpressure can be observed. According to user's need, model RHZKF6.8/30, RHZKF9/30and RHZKF 6.8/30-2 can be matched with junction of other's help. The switchof cylinder can be equiped with self-locked switch.(1)RHZKF6.8/30 self-supporting breathing apparatus (firefighting name is positivepressure firefighting breathing apparatus)Its cylinder is a composite carbon fiber cylinder with a small weight, a large columnand a long life.(2) RHZKF3.0/30 self-supporting breathing apparatus (firefighting name is positivepressure firefighting breathing apparatus for commander) It bears a 3L cylinder. The total weight is 1/3 of model RHZKF 6.8/30. It is quitesuitable for commanders.(3) RHZKF9/30 self-supporting breathing apparatus (firefighting name is positivepressure firefighting breathing apparatus) This breathing apparatus carries a 9L composite carbon fiber cylinder which isof a large volume and a long life.(4) RHZKF 6.8/30-2 self-powered breathing apparatus (fire fighting name is positivepressure firefighting breathing apparatus) This breathing apparatus carries two 6.8L composite carbon fiber cylinders whichare of large column and a life of two times of model RHZKF 6.8/30 producing area:China