| 摘要 |
To avoid a disadvantageous influencing of the lifetime of a chemically active absorption filter (7) which is arranged in the flow path (6) of an air supply containing at least one further flow path (5), a change-over flap provided for the alternating switching-on of these two flow paths (5, 6) has allocated to it a time element (12) which allows the absorption filter (7) to be effective only for a time span which is inversely proportional to the respective travel velocity. <IMAGE>
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