The method involves separating a part of oxygen from a gas mixture in gas separation systems (3, 4). A gas mixture enriched with nitrogen is guided at room temperature of enclosed rooms (2), and is provided at an outlet of the gas mixture. A control unit (5) controls the gas separation systems in such a manner that an oxygen residual content of the gas mixture enriched with the nitrogen is changed as a function of the oxygen content in the room atmosphere of another enclosed room (10). An independent claim is also included for an inerting system for setting and holding predetermined oxygen content in a room atmosphere, comprising a gas separating system.
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