| 摘要 |
<p>The sleeve is used for connecting air conditioning outlets into the opening in the wall (4) of a building to also hold the sleeve on the outlet itself. It is made from plastics, has a large number of tongues (4) moulded in a spiral pattern around its external surface (3). There tongues are flexible can flex about a forward section which forms a solid pivot. When pushed into an opening, the tongues grip seal against its sides (13) those tongues passing through the opening prevent any axial movement.</p> |
