The product is a three part hinge, one part a door frame mounting body, one part a door mounting body, one part a connecting device linking the mounting bodies together in such a way as to allow the door to swing freely and to maintain the instantaneous axis of rotation of the leaf perpendicular to a horizontal plane during the full operational cycle between the closed and the open condition of the door, the mounting bodies and the related connecting device providing a variable geometry within a multi-axis concealed hinge assembly. The product is predominantly made of steel, stainless steel, aluminium or zamac. The product is not covered by a harmonised European standard (hEN).
Under the CPR, harmonised technical specifications are harmonised European product standards (hENs) established by CEN/CENELEC2 or European Assessment Documents (EADs) produced by the European CPR指令認證的依據是建築指令歐盟協調標準或歐盟評估檔（EADs）
European Organisation for Technical Approvals (EOTA) as the basis for issuing ETAs for products not covered by hENs.The harmonised technical specification for a product defines EEA-wide methods of assessing and declaring 對於沒有被協調標準完全覆蓋的建築產品的認證，可以通過EOTA機構核發ETA認證證書（等同於CE認證書）。
歐盟公告NB機構&TAB機構-捷克TZUS(NB1020)介紹
TZUS是歐盟公告號機構，其歐盟公告號為1020(Notified Body 1020-NB1020)。可以根據歐盟相關規定來簽發CE證書。 TZUS同時也是ETA(European Technical Approval)的認證委員之一，可以根據相關法規來簽發ETA證書。
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