| 摘要 |
A hollow vessel (1) which is partitioned into one or a plurality of hollow chambers (S) by blow molding is used as a resonator (2), and the hollow vessel (1) is arranged to form a fan shroud body (3), and that a drain hole (13) is formed in a bottom portion and/or a lower side portion of the hollow vessel (1), and a communicating pipe (4) fitted to the hollow vessel (1) and an air intake duct (5) connected to the communicating pipe (4) are formed integrally with the hollow vessel (1).
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