EN 405:2001 Respriratory protective devices - Valved filtering half masks to protect against gases or gases and particles - Requirements, testing, marking

This document has been prepared by Technical Committee CEN/TC 79 "Respiratory protective devices", the secretariat of which is held by DIN. This European Standard was approved by CEN 8 November 2001. This European Standard supersedes EN 405:1992. — 42 p.
This European Standard specifies the performance requirements, test methods and marking requirements for valved filtering half masks incorporating either gas or combined filters as respiratory protective devices except for escape purposes. It does not cover gas filtering half masks which do not have valves or are fitted only with exhalation valves. It does not cover devices designed for use in circumstances where there is or might be an oxygen deficiency (oxygen less than a volume fraction on 17 %).
Laboratory and practical performance tests are icluded for the assessment of compliance with the requirements.