| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a filter structure which can be easily installed even in a ventilation path of a small cross sectional shape without lowering dust collecting efficiency. Ž<P>SOLUTION: A filter 1 pleated so that a peak part 1a and a dent part 1b alternately continue along an air flowing direction when installed in an air conduit includes: a first dust collecting surface 1f formed by being bent to the inner side with the dent part 1b as a bending center at the end part on the air inflow side of each dent part 1b; and a second dust collecting surface 1j formed by being bent to the inner side with the peak part 1a as the bending center at the end part on the air outflow side of each peak part 1a. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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