| 摘要 |
<p>A sheet element for use as an air channel and windscreen over insulation, constructed of two foldable sheet members (5 and 6). The sheet members (5, 6) are joined together along two adjacent side edges (7, 8) parallel to the folds. The sheet element may be folded up into a compact, elongate pack, which may optionally be bent crosswise. The one sheet member (5) has a height for its fold ridges that is lower than the height of the fold ridges for the other sheet member (6). When the sheet element is drawn out from its folded state, said one sheet member (5) will thus be extended substantially flat, while the other sheet member (6) will still be provided with stiffening folds.</p> |
