uPVC: Invisible Sash & Secure

The KF 520 brings together sleek design and advanced technology in a high-performance uPVC window. Its innovative sash design is nearly invisible from the outside, creating a seamless glass appearance that closely resembles fixed glazing—maximising natural light and modern appeal.

Internorm’s I-tec Secure system delivers outstanding security, with integrated flaps that lock on all sides for resistance up to RC3. This industry-leading technology makes the window virtually impossible to lever open, offering true peace of mind.

With Uw values of up to 0.63 W/m²K and sound insulation up to 46 dB, the KF 520 ensures excellent energy efficiency and acoustic comfort. Built with high-quality, low-maintenance uPVC, it’s the ideal choice for those seeking clean lines, daylight-filled spaces, and reliable long-term performance.

Features:

• Maximum Light: Designed with a large glass area to allow plenty of natural light into your home.
• Invisible Sash: The window sash is concealed from the outside due to its innovative glass design, creating a sleek and modern appearance.
• Seamless Look: Visually indistinguishable from fixed glazing, offering a clean and uninterrupted aesthetic.
• Revolutionary I-tec Secure: Features a unique locking system that makes it virtually impossible to lever the window open, providing exceptional security.
• Integrated Locking Flaps: When locked, integrated flaps press into the frame profile on all sides, offering maximum burglary protection.
• High-Quality uPVC Frame: Constructed from durable and low-maintenance uPVC material.
• Excellent Thermal Insulation: Achieves a U-value of up to 0.63 W/m²K, contributing to energy efficiency and reduced heating costs.
• Effective Sound Reduction: Offers sound reduction of up to 33 - 46 dB, creating a quieter and more comfortable indoor environment.
• High Security Rating: Achieves a security rating of up to RC 3, providing a high level of protection against intruders.
• Fully Integrated Locking: The locking mechanism is fully integrated within the window system for smooth and reliable operation.
• Standard Installation Depth: Features an installation depth of 90 mm, suitable for various wall constructions.
• I-tec Glazing: Incorporates advanced I-tec Glazing technology for enhanced thermal performance and security.

Benefits:

• Bright and Airy Interiors: Enjoy naturally lit living spaces, enhancing comfort and well-being.
• Modern and Minimalist Design: Elevates the aesthetic appeal of your home with its clean, contemporary look.
• Enhanced Security and Peace of Mind: The I-tec Secure system provides unparalleled protection against break-ins, ensuring your safety and security.
• Energy Savings: Excellent thermal insulation helps to reduce heat loss, leading to lower energy bills and a more sustainable home.
• Improved Comfort: Effective sound reduction creates a more peaceful and quiet indoor environment, free from external noise.
• Low Maintenance: The uPVC frame requires minimal upkeep, saving you time and effort.
• Smooth and Reliable Operation: The fully integrated locking system ensures ease of use and long-lasting performance.
• Versatile Installation: The standard installation depth makes it suitable for a wide range of building projects.
• Increased Property Value: High-quality, secure, and energy-efficient windows can enhance the value of your property.
• Availability: Also available as a uPVC-Alum window.

In summary, the KF 520 uPVC Window primarily targets homeowners, architects, and property developers who prioritise modern design, exceptional security, and high performance in a uPVC window system.