Wall trays are available in 4 widths:
The wall trays are attached to the support pillars . If the trays are made of steel, the use of rivets is recommended . In all other cases, the connectors are individually matched with the material from which the pillars are made. The sealing tape is placed along the pillars , on the front of the tray  and between the trays . Use 4.8 x 20mm connectors  for fastening vertically connected trays. Maintain a ~1cm distance for horizontally connected trays , in order to enable the structure to operate smoothly.