| 摘要 |
The roller shutter (4) is located in a housing (5) made in two sections - one formed by a recess (6) in a concrete lintel (2) above the door or window (3), and the other by a housing (7) extending upwards from the door or window frame's upper fixed member (17). The housing is fastened to the concrete lintel by a cement strip (16), dowels and a seal (26).
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