Urban design U21 sliding window

The urban design U21 sliding window is characterized by profiles that are marked by their bold and modern presence. This design recently gained momentum in private and luxury homes lokking for a trendy upmarket appearance.

The system is built to incorporate an inner shutter between the glass panes. This system is designed to withstand heavy duty use and is suitable for large openings.

Similar products:

Urban design U11 windows Urban design U11h windows  Urban design U22 Sliding door Urban design U22h sliding door Urban design U12 doors Urban design U12h  DoorsBelgian design B21 sliding window


[monolithic glass]: 5-10mm;  [laminated]: 8-16 mm;  [insulated glass]: 17-28, 31-43 mm.



Locking mechanism with three locking points. Handles come in a variety of unique designs, including push and slide handles, uniquely designed to enable easy opening of heavy windows.


Maximum sash size

Width up to 120 cm, height up to 280 cm. Meaning, a double panel door could reach up to a width of 2.40 m and a height of 2.80. If interested in a larger width, additional sashes could be added, or move to the U22h series.



In this series it is recommended to use the RAL and metallic color chart.

You can choose a color from Extal's colorcharts, including: (S) satin, (M) metallic or (G) grain.