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The MT-40 D is designed as a metallic substructure system that is made of thin-walled steel in C shape with surface coating for the indoor environment. The open side of the profile interfaces with other assembly components to form a flexible modular support substructure that is fastened to concreate or steel frame structures. They are horizontal and vertical members at different lengths that interconnect to form either 2D or 3D structures to carry the weight and hold in place mechanical, electrical, and piping services. For the placing of the product on the market in the European Union European Free Trade Association EU/EFTA) (with the exception of Switzerland) Regulation (EU) No. 305/2011 (CPR) applies. The product needs a declaration of performance taking into consideration the following European Technical Approval ETA-21/0414 assessed based on EAD 280016-00-0602 `Products for installation systems for