| 摘要 |
The window comprises an external frame and separate glass support frames with a passage for the renewal and/or circulation of air round the glass support frames. The glass (13) on the room side of the window preferaly incorporates a heating element. Air circulation is created by a fan (5) placed above the inner pane and is directed along the surface of the heated glass towards the ceiling of the room. Fresh air, which enters round the top of the external frame (7) traverses the filter (6) installed between the outer frame and the intermediate frame (11). |
