| 摘要 |
<p>This invention relates to a rotatable shutter for slot ventilation through a hollow profile of which the internal wall and external wall form a continuous hollow chamber, characterized in that in above said hollow chamber a shut off element (8) is mounted, which can revolve around an axis (9) extending over the entire length of the hollow chamber, between the open and closed positions, to which purpose said shut off element (8) shows an oblong cavity (14) in which fits a tap (13) being part of a disc (11) which is rotatable from outside the hollow profile. <IMAGE></p> |
