| 摘要 |
<p>A ventilation device (1) is provided for location at the outer edge of a window frame (52) and comprises side members (5A) defining inlet and outlet portions. The members (5A) provide opposing sockets (13B) to receive plates (4) completing a closed duct in the device for air flow, the width of this device (1) being varied by providing plates (4) of different width. The ends of the duct include closure assemblies (17), and the side members (5A) preferably comprise exactly similar structures. Weather members (6) are fitted to the side members by releasable fastening means (7, 8). In an alternative embodiment (Fig. 4), the side members are dissimilar, one integrally carrying the plates (37) while the other includes the socket (35) for the plates.</p> |
