AluK 40N is an outward-opening casement window solution with a range of high-performance product options for single and double glazing of 5 to 36 mm, allowing this system to stand out for its affordability, aesthetics, functionality and performance. Constructed on a 40 mm module, the 40N casement series is available in complete flush or overlap look from inside and comes in both with or without glazing bead option. The system can be easily integrated with AluK SC40 Sliders, and is suitable for both residential and commercial buildings.