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KF 520 meets the highest demands for burglary protection, thanks to its state of the art locking system. The sleek frame offers excellent thermal efficiency and sound reduction for maximum comfort. This model is available in the flush mount Studio design, for an ultra modern aesthetic.

Its innovative design features a fully integrated locking system, which renders levering of the window impossible. Optional built-in ventilation can be added into the window frame with the I-tec Ventilation system. I-tec Glazing ensures excellent stability, thermal insulation, and security due to the all-round bonding of the glass pane.

Read more about Internorm I-tec Innovations.


Thermal Efficiency
UW as low as 0.65 W/m²K
Triple Glazed
Sound Reduction
Up to 46 dB
Resistance class RC2 | Fully integrated locking system
Construction Depth
uPVC: 90 mm | uPVC - Aluminum: 93 mm


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