A door unit consists of 2 door slabs, matching jambs and casings, extensions (if needed), hinges, a lock and a handle (single- or double-sided). This is the most traditional and frequently used door configuration in the market. For closet openings, we use double magnetic catches to keep the doors closed. In inter-room doorways, one slab usually remains passive and fixed with a flush-bolt. Astragal is used in order to seal a small gap between a pair of doors. It is a vertical molding attached to one or both swinging doors, against which the other door seals when closed.