| 摘要 |
<P>PROBLEM TO BE SOLVED: To avoid filtration dominant on the surface and rapid deposition of a filter cake causing too early clogging. Ž<P>SOLUTION: A cladding material for buildings or other constructions comprises an outer air-permeable cover 3, an inner air-permeable cover 4, and an intermediate layer 2. The intermediate layer is provided with a stepped filtering profile for allowing selective particle filtration, thereby promoting filtration through depth to delay clogging. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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