Everywhere need to fire prevention work rigorous treatment, fire in the event of consequences, including firefighters in fire air breathing apparatus, when the male positive pressure 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.