| 摘要 |
The device has two sheet panels (1,2) each folded up with a support at its left end and right end, respectively and placed at a doorway. The panels are rigidified by U-shaped flanged sheets (10) on their circumference. The panels are provided with foam joints (3,4,5,6) at their junction and circumference to ensure sealing. Threaded rods modulate the panel spacing to ensure pressure on side joints of panels.
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