| 摘要 |
PROBLEM TO BE SOLVED: To reinforce underfloor ventilation, air passage, and moisture removal by suction from a retractable duct, and to resolve a problem of suction of every place by distributing the duct. SOLUTION: In a ventilation fan body 2, two ducts comprised by attaching the retractable ducts 5 to columnar pipe protrusion parts 4 of a suction side box cover 3 and fixing them by bands 6 can be extended freely. It is characterized by that a problem of a blind spot of ventilation is resolved by attaching the retractable duct comprising such a composition. COPYRIGHT: (C)2005,JPO&NCIPI
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