This is the first stage of development of the standard system. To meet the requirements of the manufacturers, APS Arosio modified certain standard models by blunting the outer profile. The frames that can be created have a more compact shape. By using the standard assembly method, the assembly procedures remain unchanged. The union of the modules has been simplified by introducing a specific conjunction system. It is possible to obtain structures, externally blunted, by using the profiles PS140-25-0 with the corner pieces AS430-25-0, and create continuity between the modules by using the union profiles PG140-2500 and the related corner pieces AGS430-250. The completely flat internal surface obtained, enables the use of the union block TH5009-000 also inside the unit.