A fan assembly for a computer system that includes a fan, which has a flange having at least three fastening openings; and a holding device with at least two spring-loaded first fastening elements and a second fastening element. The fastening elements are arranged relative to one another such that in a relaxed state of the first fastening elements, the fan can be placed on the holding device in a first manner such that only the first fastening elements engage into respective two fastening openings, and in a second manner against a spring force of the first fastening elements.