The ATLAS detector relies on a large electronic infrastructure requiring reliable thermal management to ensure stable operation of its readout and control systems. The cooling method of the ATLAS electronics racks is based on a closed-loop air-circulation system in which tangential turbines circulate air through air-water heat exchangers connected to the CERN chilled-water network. The original turbine units currently used in the cooling system are no longer commercially available. Consequently, a replacement turbine configuration must be integrated while maintaining compatibility with the existing rack infrastructure and preserving cooling performance. This thesis presents the integration and validation of a revised ventilation system for ATLAS electronics racks.