BS EN 17020-4-2021Extended application of test results on durability of self-closing for doorsets and openable windows. Durability of self-closing of fire resistance and/or smoke control hinged and pivoted metal framed glazed doorsets and openable windows

标准类别：[BS] 英国标准学会标准
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标准编号：BS EN 17020-4-2021
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更新时间：2022-04-01
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BS EN 17020-4-2021Extended application of test results on durability of self-closing for doorsets and openable windows. Durability of self-closing of fire resistance and/or smoke control hinged and pivoted metal framed glazed doorsets and openable windows

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