1. The 120 series does not refer specifically to the profile section, but to the height of the vertical keel of the curtain wall.
2. At present, most large curtain wall companies have their own patents, and each company's atlas is different.
3. The 120 series of the same company is also divided into exposed frame and hidden frame, so you need to look at the curtain wall drawings in detail. But what is clear is that the height of the column is 120MM.