| 摘要 |
The element (10) has a main projection body (20) fixed on an opening element (100) formed in a tile support plate for cooperating with the element, where the support plate comprises undulations. A returning body (30) is connected to the support plate, so that the projection body and the support plate are at the same level when the element is on the opening element. An outlet conduit is used as a ventilation conduit or a chimney conduit. |
