BS EN 17020-1:2022
防火和/或防烟门和可开启窗户自关闭耐久性测试结果的扩展应用 铰链和枢轴钢门自关闭耐久性
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 hinged and pivoted steel doorsets