DIN EN 17020-2 E:2016-08 防火和/或防烟门和可开启窗户自关闭耐久性试验结果的扩展应用 第2部分:钢质卷帘门自关闭耐久性(草案)
Extended application of test results on durability of self-closing for fire resistance and/or smoke control doorsets and openable windows - Part 2: Durability of self-closing of steel rolling shutters