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Licensed Copy: Gilbert Athens, University of Birmingham, 11/06/2008 06:11, Uncontrolled Copy, (c) BSI BRITISH STANDARD BS EN 12941:1999 Incorporating Amendment No Respiratory protective devices — Powered filtering devices incorporating a helmet or a hood — Requirements, testing, marking The European Standard EN 12941:1998 with the incorporation of Amendment A1 has the status of a British Standard ICS 13.340.30 12&23