| 摘要 |
Air filter supplying breathable air, including filter elements in series, namely a prefilter, a submicrofilter and a filter containing active charcoal. This filter is characterised in that it additionally includes, at the outlet of the third filter containing active charcoal, a fourth filter containing silica gel and, at the outlet of the latter, a fifth filter containing an agent which converts carbon monoxide into carbon dioxide.
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