| 摘要 |
PROBLEM TO BE SOLVED: To provide a louver unit using a transmission type filter medium, easy to exchange a filter and made compact as a whole. SOLUTION: The louver unit is equipped with a filter aggregate 20 constituted of several kinds of sheetlike filter elements 21 and the sheetlike spacers 22 interposed between the filter elements 21. A large number of venting holes 22a are formed to the spacers 22 and a fixing means 23 for regulating the relative positional change of the spacers 22 and the filter elements 21 in the surface direction of the spacers 22 is provided in such a state that the positions of the venting holes 22a formed to the spacers 22 at the positions opposed so as to hold the filter elements 21 are positionally different in the surface direction of the spacers with respect to the spacers at the opposed positions.
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