The clear height in the box cleaning area between the finished floor and the ceiling has to be 4.00 m Above the panel ceiling, with a distance of one meter, a primary construction will be installed by the Buyer (primary steel construction with double T beams, parallel every 2500 mm in same direction as the roof construction. The load, which has to be carried, is between 300 to 700 kg/m on request of the seller). For this purpose the Seller will provide the load data and the horizontal distances which are required to carry out the primary construction in an adequate form. The primary construction will be lowered from the roof beams of the building.