gutter 30 can be seen which runs along the length and the width of the inner frame 10 over which the second seal 12 or silicon strip 80 is placed along the length of the gutter grooves 31 are seen over which the seal anchors 32 such as can be seen in fig1 and 10a are inserted this will allow proper fastening and will avoid the detachment of the second seal 12 in relation to the gutter 30 and more generally regarding the inner frame 10 alternatively if the silicon strip 80 is installed over the gutter 30 then the grooves can be excused similarly fig9 shows that in the inner frame 10 specifically close to the border between the front wall and the lateral wall a series of compression retainer holes 33 are provided as well as assembly holes 34 at least four compression retainer holes 33 are destined to receive and fasten by means of fastening means 4 the retainers 13 and as a consequence the tempered glass 3 on the other hand at least six assembly holes 34 are destined to receive and fasten by means of fastening means the outer frame 20 fig1 is a detailed view of the retainers 13 the retainer 13 is made up of five distinctive parts a first part 50 contains at least two holes 5 which shall receive locators of the outer frame 20 a second part 51 is substantially transversal to the first part a third part 52 substantially parallel to the first part 50 and consequently substantially transversal to the.