Abstract: The present invention concerns a rack for computer servers consisting of a carrier structure supporting a plurality of superposed trays extending substantially horizontally, each of said trays being fitted with electronic components organised so as to allow air to flow between the superposed trays and said electronic components, the air flow taking place between the ambient air, via an open area, and an inner discharge space extending perpendicular to said trays, said discharge space having a cylindrical configuration, said trays having the shape of superposed trapezoidal petals completely surrounding said cylindrically configured inner discharge space and said trays supporting radial separation means extending to a height of at least half the distance separating two superposed trays.