To prevent grit, gravel or other objects from getting stuck in the sill’s guide grooves and thus impairing the movement of the door panels, we offer a hidden track version.
In this case, the sill creates a flat surface without any guide grooves, the

fast door panel is guided from below over a metal plate that is folded 180°.
The slow panel(s) is/are guided either on a roller set on the sill or in the outer guide grooves in the sill.

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