Firemen also need to be protected, air breathing apparatus is to protect a fireman a security equipment, air breathing apparatus is widely used in fire fighting, chemical, shipbuilding, petroleum, metallurgy, electric power, warehouse, laboratory, mining and other fire key departments, for the firefighters or rescue and ambulance crews in the smoke, gas, steam and anoxic environments such as safe and effective fire-fighting and rescue and disaster relief and rescue work, is the ideal of firefighters or rescue and ambulance personnel individual respiratory protective device.