Respiratory protective devices are protective devices intended to protect against hazardous substances in the aeriform state such as particles, vapours and gases by means of the filtering mechanism. These devices, which partially or completely cover the face, are made of filtering material or consist of a reusable structure fitted with replaceable filters.
The EN 13794 standard specifies the minimum requirements for self-contained closed-circuit breathing apparatus, of the chemical oxygen (KO2, NaClO3) and pressurised oxygen type. So-called self-contained closed-circuit breathing apparatus for escape. It does not apply to work and rescue apparatus or to diving apparatus.