| 摘要 |
PROBLEM TO BE SOLVED: To provide a drainboard structure capable of controlling the air volume regardless of a simple structure. SOLUTION: The drainboard structure 21 is composed of a first board part 31 and a second board part 61 capable of changing the relative position and being mutually superposed. The drainboard structure 21 is constituted so as to enable control of the air volume which passes a first through hole group 41 which passes through the first board part 31 and a second through hole group which passes through the second board part 61 by change of relative position of both board parts. The control of the air volume can be carried out by a simple structure of only the first board part 31 and the second board part 61. COPYRIGHT: (C)2005,JPO&NCIPI
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