Architectural aluminium systems supplier Kawneer has enhanced its AA540 window range, which combines value for money with a BRE Green Guide "A" rated frame*, with a tilturn variant. The AA543 tilturn window joins an AA541 casement and AA542 pivot window in suiteing with Kawneer's AA100 and AA110 curtain walling, 451PT framing and door systems to give specifiers and architects ultimate …