| 摘要 |
PROBLEM TO BE SOLVED: To provide a filter unit which causes little dropout of an adsorbent, which has good collecting efficiency for particles having 0.3 to 0.5μm particle size under the condition of 5.3 cm/sec air flow with little pressure loss and which can be satisfactorily used even in a high humidity environment and has high deodorizing performance and a long deodorizing life. SOLUTION: The filter unit excellent in the pressure loss and collecting efficiency and showing extremely little dropout of powder can be obtained by disposing a filter medium 8 in the upstream side and a base material 12 to remove coarse dust in the downstream side. The filter medium 8 is composed of, from the upstream side, a water-repellent and air permeable base material 9, a filter medium to remove dust, an adsorbent 5 and an air permeable base material I. Moreover, the filter unit having a long deodorizing life is obtained by using the water-repellent air permeable base material 9 in the most upstream side.
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