| 摘要 |
A building has a wooden outer door which is also a fire-door. The door has an outer frame (2) which is covered on both sides by hard fiber board, either side of a mineral fiber panel. The outer frame is surrounded by a bonded wooden strip (3). An expansion 'Roku' strip (15) is esp. located in the folding zone between the frame (2) and the strip (3). The frame (8) also incorporates a cement-bonded chipboard (7) and rubber seal (13).
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