| 摘要 |
PROBLEM TO BE SOLVED: To obtain a duct efficiently preventing adhesion of air to an inner wall face of a duct body, reducing air resistance, achieving sufficient strength even by using a thin steel plate material and reducing costs. SOLUTION: In the duct formed by interconnecting the duct bodies formed by the steel plate material by using connecting fittings, an air adhesion prevention part comprising any of a large number of recesses, projections, or recesses and projections preventing adhesion of air made to flow within the duct body to the inner wall face and enhancing strength, is formed on the wall face of the duct body. COPYRIGHT: (C)2010,JPO&INPIT
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