40N Casement Window System

The AluK 40N Casement Window System is designed to deliver reliable performance, smooth operation, and a clean modern look while maintaining excellent value. Built on a compact 40 mm module, this system supports glazing thickness from 4 mm to 26 mm, giving you flexibility for single or double glazing based on your insulation needs. It offers both hinge and friction-arm opening options, along with a choice of flush or double-overlap sashes to match different design styles. Rectangular or round glazing bead options further enhance the system’s versatility.

The 40N performs well in demanding environments with rated performance of Air Permeability Class 4 (600 Pa), Water Tightness Class 9A (600 Pa), and Wind Load Class C4 (1600 Pa). Its outward-opening design offers excellent ventilation and clear views, while the tight sealing helps improve insulation, reduce outside noise, and protect the interior from dust and weather. With strong structural performance and easy-to-maintain hardware, the 40N is a dependable choice for homes, schools, hospitals, hotels, and light commercial spaces.
Key Highlights
Glazing thickness range: 4 mm – 26 mm
Frame depth: 40 mm module
Opening options: hinge or friction-arm
Sash styles: flush or double-overlap
Glazing bead choices: rectangular or round
Performance ratings:
Air Permeability: Class 4 (600 Pa)
Water Tightness: Class 9A (600 Pa)
Wind Load: Class C4 (1600 Pa)
Max sash dimensions: approx. 700 mm width, 1500 mm height
Max sash load: approx. 32 kg
Available in single or double sash configurations
Outward-opening design for effective ventilation