uPVC-Alu: Frameless Look, Maximum Security

The KF 520 combines cutting-edge design with advanced performance, offering a sleek, frameless aesthetic that maximises natural light. From the outside, the sash is virtually invisible—creating a smooth, minimalist appearance that closely resembles fixed glazing.

Beyond visual appeal, the KF 520 leads in security with Internorm’s I-tec Secure system. This innovative technology uses integrated locking flaps that press into the frame on all sides when closed, achieving burglary protection up to RC3—making it one of the most secure windows in its class.

With Uw values of up to 0.63 W/m²K and sound insulation up to 46 dB, the KF 520 ensures optimal energy efficiency and acoustic comfort. It's the perfect choice for those seeking contemporary style, enhanced daylight, and complete peace of mind.

Features:

• Material: uPVC interior, Aluminium exterior
• Design: Lots of glass, plenty of light, invisible sash from the outside (glass design).
• Security: Enhanced security up to RC 3 with I-tec Secure locking system (virtually impossible to lever out, integrated flaps).
• Availability: Also available as a uPVC window.

Benefits:

• Maximises natural light with its glass-focused design.
• Offers a sleek and modern aesthetic with the invisible sash.
• Provides exceptional security with the innovative I-tec Secure system.
• Ensures excellent thermal insulation for energy efficiency and comfort.
• Offers good sound insulation for a quieter home.

Homeowners looking for modern windows with a focus on maximising natural light and providing high levels of security.