BS 8468-6.2:2020 pdf free.Respiratory protective devices for use against chemical, biological, radiological and nuclear (CBRN) agents. BS 8468-6.2 This British Standard specifies requirements for compressed air line breathing apparatus with constant airflow as a respiratory protective device intended to be used during rescue, evacuation,escape, hazard containment and decontamination, and similar activities by emergency first responders or first receivers (e.g. fire,...