Abstract: A sliding door arrangement for closing a passage opening in a mainly vertical wall construction and comprising a mainly horizontally movable door unit, a door frame unit attachable to the wall construction, guide and closure devices of said door unit and sealing members of the door and the frame unit. The door unit is moved between two frame members of the frame unit. The door unit comprises a number of door members, of which at least one is movably adjusted in the direction of the passage walk. This movable adjustment allows a shift of the door member against the passage opening, during a final or an initial phase of the door unit motion parallel to the wall construction and guided by the guide devices. The door unit is brought by the shift into a tight contact against sealing members of the frame unit or is disconnected from a contact thereof.