Opti Therma Curtain Wall façades The technical department at Granada Aluminum has developed curtain wall facade sections, where all of these sections have become thermally insulated and high-efficiency glass such as DS, SN is used to comply with modern construction requirements. These sections are available in different sizes from 5 to 25 cm and several thicknesses for the same section in accordance with the size of the construction openings. The most appropriate section is chosen according to precise technical construction studies.