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. Each class features specific filters.
Standard EN 1146 refers to open circuit compressed air self-contained breathing apparatuses equipped with a self-rescue hood. It specifies the minimum requirements for compressed air apparatus for leaks with a hood. The standard does not apply to work and rescue equipment and underwater respirators.