The elements consist of statically effective top and bottom chords made of extruded aluminum. The front and rear panels, made of high-quality alloyed aluminum, are attachted to the chords and riveted, as are the side caps. Top and bottom chords act as a tongue and groove system to prevent the passage of sound. The side caps are also made of extruded profiles with incorporated gaskets. The structure of the product is also the basis for aluminum large area elements in various designs.