| 摘要 |
PROBLEM TO BE SOLVED: To provide a duct easy in secure connection work of a spiral duct and easy in suspension inexpensively. SOLUTION: The duct is provided with the spiral ducts 2 each comprising a spiral duct body 8 and a pair of flanges integrally formed at both ends of the spiral duct body 8 by using a flanging machine to project outwardly like a flange; and with connection fittings each comprising a ring-shaped connection fitting body 3 which includes a chevron flange storage part for covering superposed flange portions of the spiral ducts 2 formed by interconnecting the plurality of flange portions in series to be superposed on each other and support pieces protruded from both ends of the flange storage part outwardly in the approximately rectangular direction and abutting on the outer peripheral wall nearer to an end of the spiral duct 2 with a part cut, and a fixing tool mounted to a portion nearer to the cut end of the connection fitting body 3 and fastening and fixing the connection fitting body 3. COPYRIGHT: (C)2010,JPO&INPIT
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