Particularly narrow Belgian sliding window B21

Sliding windows system B21, belongs to the Belgian design series. This design is characterized by narrow aluminum profiles with a non-smooth surface.

The focus in this category is the sash sections with combination of fixed sides. The B21 system is designed for small to medium openings. Joint sashes and trims are cut at a 45 degree angle. This is the most narrow sliding window system on the market.

Similar products:

Belgian window B11- two sashes with lower fixed sectionBelgian window B11-two sashes with upper fixed archBelgian designed window B11- two sashes with fixed sides and lower sectionsBelgian window B11- turn and tilt with side fixBelgian opening window B11Belgian designed sliding door B22h for large openingsDouble panel+ 2 fixed sides in B12 Belgian designed iron door


[single glass]: 4-6 mm;  [glass layers]: 6-12 mm;  [insulated glass]: 14-18 mm.


Lock handles

Locking system with 2 points. Locking mechanism  handles in varied and unique designs including push and slide handles. It is customary to complete the designed look of these windows with handles in an antique appearance.


Maximum sash size

Width up to 90 cm, height up to 160 cm for single sash.



In this series it is recomended to use the metallic fans for an antique look with an iron appearance.

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