PROTECTION DOORS: 205 door elements for "The Circle" The construction project owners engaged Hammer Metall AG in Nänikon with the planning, manufacture and assembly of 205 steel door elements. The majority [...] logistics requirements," explains Reto Meier, Managing Director of Hammer Metal. Each door is unique Although the different door elements with their various requirements could be combined into six or seven classes [...] our order into different steps, but not by door type but rather by the construction sections mentioned above. This means that each step comprised all of the door element types, which made series production