Rack PCs * are powerful industrial computers for server applications that are mounted in a 19-inch rack. The front panel operational controls and interfaces are located behind a splash-proof door. Robust and easy-to-install card hold-down devices can be adjusted to any height and ensure that the built-in cards is held securely. For example, shockmounts mechanically decouple built-in components from the housings, and Flat contact is ensured via an HF seal (EMC, CE). The overpressure ventilation ensures that the housing is free of dust thanks to a replaced filter mat that can be.