Triple-leaf windows, symmetrical horizontal division triple-leaf with a movable mullion

Horizontal symmetrical division 33-33-33 with a movable post windows types-of-windows triple-leaf horizontal-symmetrical-division-33-33-33-with-a-movable-post

Triple-leaf windows with a symmetrical horizontal division trzyskrzydłowe with a movable mullion. The leaf widths are the same. The movable mullion is one of the elements of the window structure, permanently connected to one of the sash frames. This makes it possible to divide the window with the sashes closed, but after opening them, it allows free use of the non-divided space.