| 摘要 |
The present invention relates to an air gap sheet comprising at least a planar surface and at least a distance means, whereby it comprises a planar sheet (1) provided with a number of folding lines (2, 3,4, 5, 6, 7, 8, 9, 10, 11, 12, 13), which are intended to form one or more distance means, two planar coinciding surfaces, and two fastening outer folds on either side of the planar sheet, as well as a fixation means (17) keeping the distance means together .
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