Urban design sliding window U21

The urban design sliding window U21 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 designed windows U11Urban designed windows U11hSliding door U22 in urban designUrban designed sliding door U22h for particularly large openingsUrban designed doors U12U12h Urban DoorsParticularly narrow Belgian sliding window B21


[single glass]: 5-10mm;  [glass layers]: 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 fans.

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