| 摘要 |
The installation body comprises a primary grid body (10), which forms a base wall with an edge flange, and intersecting grid bars, which extend between the opposite sections of the edge flange and are connected with the edge flange and form an adjacent, one-sided open chamber. A secondary grid body (30) is provided, which has intersecting grid bars arranged inside the area limited by the edge flange. The grid bars form adjacent both side open chambers, which are connected with each other by notches in the bar. |
