| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ventilation sleeve capable of improving the efficiency of construction and maintenance performance. <P>SOLUTION: The ventilation sleeve 2 wherein a ventilation passage communicating with an indoor side and outdoor side is formed and is constructed on a wall 1 of a building is composed of a cylindrical sleeve part 3 provided with a flange 3a on one end and a second flange 4 fitted and inserted into the sleep part 3. The sleeve part 3 has a plurality of projections 3b on the outer circumferential surface vertically and regularly arranged in the axial direction protruding toward outside. The second flange 4 has a projection 4a protruding toward inside to engage with the projection 3b of the sleeve part. <P>COPYRIGHT: (C)2012,JPO&INPIT |
