Cord operated. For use with curtains 16 m w and 5 m h weighing not more than 25 kg. The curtain opening can be central, lateral, multiple or asymmetric. The system is suitable for ceiling installation with inset rotating steel keys and wall installation with overhanging brackets. The operating cords run in independent side-by-side channels allows systems with 90° curves or wide radius centring to be installed guaranteeing maximum sliding.