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Internorm KF 520 uPVC-Aluminium Triple Glazed Window

  • The new generation of KF520 windows from Internorm is a perfect combination of innovative design and technical know- how. With a glass sash and a slimline frame, the design evokes the look of fixed windows, and they can let more natural light into your home. Also, your new window will feature the revolutionary I-tec secure locking mechanism. Hidden in the window sash, this locking system makes levering the window almost impossible.


    • Thermal insulation Uw as low as 0.63 W/(m2K)
    • Sound reduction up to 46 dB
    • Security RC3, RC2, RC2N
    • Locking fully integrated
    • Construction depth 90/93 mm

Sound Made Simple

Acoustics Academy’s Sound Made Simple guide clarifies complex acoustic terminology with insights to design with sound.