| 摘要 |
<p>A wall entrance through a building wall extends along an entrance axis (D) with a first section (12) of fire-resistant material, which extends along the entrance axis (D) and an entrance space for receiving a pipe and with a second section (14) of fire resistant material which radially surrounds the first section (12), at least along one section of the entrance axis (D). Radially between the first- and second-sections, is an open air gap (28) extending along the entrance axis, and in the peripheral direction around the entrance axis.</p> |
