BS EN 404:1993 Specification for respiratory protective devices for self-rescue: filter self-rescuer
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This European Standard specifies performance requirements, test methods and marking requirements for filtering devices designed for protection against carbon monoxide as respiratory protective devices for personal escape (in short: filter self-rescuer). Such devices are intended for use against carbon monoxide arising from fire or explosion underground. Laboratory and practical performance tests are included for the assessment of compliance with the requirements. This standard does not include requirements for training devices. However, when such devices are available care should be taken to ensure that only correct parts are fitted to the filter self-rescuer.
This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 132, Respiratory protective devices — Definitions.
For the purposes of this European Standard the definitions given in EN132 apply, together with the following. A filter self-rescuer is a respiratory protective filtering device in a suitable packing for personal escape designed to protect the wearer against carbon monoxide. It is dependent on ambient atmosphere and does not provide protection against oxygen deficient atmospheres (less than17% oxygen).
The filtering device consists of a mouthpiece assembly with a filter. The mouthpiece assembly of the filtering device is connected directly or indirectly to the filter(s). Filter self-rescuers are of various minimum test durations as specified in this standard.
