A device for providing a passage between an external area and a room which is or can be rendered inert which is hermetically delimited from the external area by means of a wall, wherein the device comprises the following: - an airlock chamber able to be inserted into an opening provided in the wall which has a first opening forming a passage between the external area and the airlock chamber and which has a second opening forming a passage between the room rendered or able to be rendered inert and the airlock chamber; and - at least one revolving element which has at least one passage opening (15.1; 19.1; 15.2, 19.2) and which can be moved relative to the first and the second opening (13, 14) of the airlock chamber so as to enable alternatingly realizing at least one first state in which the at least one passage opening (15.1; 19; 19.1) substantially aligns with the first opening of the airlock chamber and allows entry into the airlock chamber from the external area and the revolving element essentially completely covers the second opening of the airlock chamber, and a second state in which the at least one passage opening (15.1; 19.1; 15.2, 19.2) or at least a further passage opening (15.1, 19.1, 15.2, 19.2) substantially aligns with the second opening of the airlock chamber and allows entry into the airlock chamber from the room rendered or able to be rendered inert and the revolving element essentially completely covers the first opening of the airlock chamber, wherein the at least one revolving element has two passage openings (15.1, 15.2) arranged in relation to their relative position to one another such that in a state in which the first passage opening (15.1) aligns with one of the two openings (13, 14) of the airlock chamber, the second passage opening (15.2) is not aligned with either of the two openings (13, 14) of the airlock chamber, and in a state in which the second passage opening (15.2) aligns with one of the openings (13, 14) of the airlock chamber, the first passage opening (15.1) is not aligned with either of the two openings (13, 14) of the airlock chamber. - an airlock chamber able to be inserted into an opening provided in the wall which has a first opening forming a passage between the external area and the airlock chamber and which has a second opening forming a passage between the room rendered or able to be rendered inert and the airlock chamber; and - at least one revolving element which has at least one passage opening (15.1; 19.1; 15.2, 19.2) and which can be moved relative to the first and the second opening (13, 14) of the airlock chamber so as to enable alternatingly realizing at least one first state in which the at least one passage opening (15.1; 19; 19.1) substantially aligns with the first opening of the airlock chamber and allows entry into the airlock chamber from the external area and the revolving element essentially completely covers the second opening of the airlock chamber, and a second state in which the at least one passage opening (15.1; 19.1; 15.2, 19.2) or at least a further passage opening (15.1, 19.1, 15.2, 19.2) substantially aligns with the second opening of the airlock chamber and allows entry into the airlock chamber from the room rendered or able to be rendered inert and the revolving element essentially completely covers the first opening of the airlock chamber,