Even Sky Frame's sliding window sections that are positioned on two sides of a corner can be opened soundlessly - by the press of a button on the wall or a handset. The secret: newly developed and invisible motorized telescopic cog drives. The sliding sections can be dimensioned up to four meters high and use either tempered safety glass or laminated safety glass if clients choose the certified version delivering resistance category 2 for greater burglary proofing. In order to avoid disturbing the aesthetics of the frameless sections, the drive is mounted inside the frame without any additional service flaps or faring. Stainless-steel tracks provide optimal glide for the large doors. The window wings are automatically unlocked when you press ‘open' and relock when you press ‘close'. In the event of a power-down, manual operation is possible, despite the presence of the drive.