| 摘要 |
<p>PURPOSE:To remove many kinds of gases by bringing an exclusive removing filter corresponding to the gas into and out from an air passage by a filter driving part based on the signal from a detector for detecting the gas component in the air. CONSTITUTION:The gas component in the air is detected by the detector 32. The respective removing filters 12, 14 and 18 corresponding to the gas component is brought into and out from the air passage 24 by the filter driving part 10 based on the signal from the detector 32. As a result, many kinds of gases can be removed, and the man-hour for exchanging the stage of a universal filter 22 is eliminated.</p> |
