A device for treating objects having a treatment chamber, which has a wall having a gap extending between first and wall segments. The device includes an apparatus having at least one component which extends from outside of the treatment chamber into the treatment chamber through the gap and can be moved along the gap. A sealing assembly seals the gap leaving at least one passage opening, through which the at least one component extends. The sealing assembly includes a first and a second sealing element, which extend on the first or second wall segment along the gap and have a coupling edge, the coupling edges being complementary to each other. The coupling edges are coupled to each other and, during the movement of the at least one component, separate from each other in front of the passage opening and couple to each other behind the passage opening.