| 摘要 |
<p>The ventilation shutter consists of a frame (1) enclosing an opening and closeable by a lid mounted on a building roof (4). Inner lid (5) and outer lid (6) are interconnected by plastics profiles (7). Cavities between the inner and outer lids (5, 6) may be filled with insulating material (8). Plastics profiles (7) form the connection between outer lid and have a slot (17) to clamp the top side of inner lid . Plastics profiles (13, 15, 16) carry two sealing strips (21) cooperating in the closed position with lids (2, 3).</p> |
