| 摘要 |
<p>Extractor fan for window fitting contains an electric motor driving a screw. A first rigid ring is for application to one face of the wall or window, and supports the central motor box, and an annular piece, with movable shutters. A frame integral with the annular piece is mounted, elastically jointed, in this piece to control the orientation of the shutters, and can be actuated. A second deformable ring, pref. of polypropylene is for application to the other face of the wall or window, facing the first ring, for fixing in position.</p> |
