BS EN 17020-2:2022
防火和/或防烟门和可开启窗户自动关闭耐久性测试结果的扩展应用 钢质卷帘门自动关闭耐久性
Extended application of test results on durability of self-closing for fire resistance and/or smoke control doorsets and openable windows - Durability of self-closing of steel rolling shutters