The R series units are made with the same dimensions as the rack units with rear intake and front delivery, offering various advantages: The distribution of the treated air takes place near the servers, the horizontal intake and delivery does not change the direction of the flow to the inside of the machine, reducing pressure drops and consumption by the fansMaintenance is easy thanks to front accessibility. The direct expansion RXA version has, as standard, the DC brushless inverter compressor and can be air condensed with the provided remote condenser, or water condensed. An RXU version is available with a chilled water coil. The R series can be configured with the Two Sources system with two distinct means of cooling, or with the free cooling system, to maximise energy savings.