| 摘要 |
The sliding section (1) works in guides (10, 11) on the frame (4). The cowl (18) on the frame has walls forming a box-shape enclosing the sliding section, with one wall at least (21, 22) sloping inwards, and air inlets (24) at the bottom. The cowl walls can be in sections bent at different angles, the top ones being at a smaller angle. One wall at least can form a hinging section.
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