BS EN 17020-3-2022
防火和/或防烟门和可开启窗户自闭耐久性试验结果的扩展应用 第3部分:钢质推拉门自闭耐久性
Extended application of test results on durability of self - closing for fire resistance and / or smoke control doorsets and openable windows Part 3 : Durability of self - closing of steel sliding doorsets