| 摘要 |
A building element of concrete or the like having a through duct element (2; 102) for a ventilation pipe (7, 8) or the like. The duct element (2; 102) is together with a sheet metal lid (3; 103) able to be cast into the concrete, the pipes (7, 8) being insertable into holes (5, 6) in the lid and securely held therein. The lid (3; 103) has locking means (10; 110a) enabling the lid to be readily fastened to the duct element (2; 102) by jamming or snap action. <IMAGE>
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