A series designed with a rounded sash profile, featuring important solutions that satisfy insulation requirements. The Piva75 series features profiles with 7 chambers on the sash and 6 chambers on the frame. It is possible to add insulating glazing up to 39 mm thick. Steel reinforcements are included on both the sash profile and on the frame for enhanced stability and durability. A tilt&turn opening system can be mounted, with and without roller shutter, and an internal- and external-fitting frame.