The thin upper layer (2) of the adapter sheet (1) is made of aluminum, wood, or plastic and is provided with a grid pattern (3). The even thinner bottom layer (4) is made of the same material and has several openings (14) for being connected to the vacuum creating units (10, 11). A central layer (5) consisting of a lightweight foam material and provided with horizontally positioned ducts (8) is located between them. The ducts (8) are closed at their outer ends.
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