| 摘要 |
<p>Ventilating device comprises flat elements (1, 2) with passages (1b, 2b) for an air flow. The space between the passages can be adjusted using an adjusting device (3, 4). The passages are arranged on the flat elements so that they are closed when further flat elements are placed on top. Preferred Features: The adjusting device has a screw (3) arranged on one flat element (1) and a nut (4) arranged on the other flat element (2).</p> |
