EN 17020-1:2023 防火和/或防煙門和可開啟窗戶自動關閉耐久性測試結果的擴展應用 第 1 部分:鉸鏈和樞軸鋼門自動關閉耐久性 Extended application of test results on durability of self-closing for fire resistance and/or smoke control doorsets and openable windows - Part 1: Durability of self-closing of hinged and pivoted steel doorsets