Abstract: The module comprises a stainless sheet steel framework 40 shaped to provide a rabbet 38 for receiving a double glazing and a stiffening element 3 for the fixation of the module or assembly 41, i.e., the framework 40 and the glazing assembly to the supporting structure of the building facade. To enable direct fixing into the supporting structure, the stiffening element 3 is associated with a stainless steel spring tab 4 located on the supporting structure which allows clipping of the assembly 41 to the supporting structure 5. The space between the rabbets of two adjacent modules is reduced to that required for housing a calibrated, preformed EPDM seal.