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Achieving hydraulic balance in chilled water systems is a critical challenge for HVAC designers. Often, the shortest piping route leads to the 'starved unit' phenomenon, where terminal units furthest from the pump receive insufficient flow. This article examines the physics behind flow resistance and introduces the 'Same Piping Length' (Reverse Return) principle. Through detailed animated diagrams, we demonstrate how altering the return path naturally equalizes pressure drops across all fan coil units, ensuring consistent cooling performance and eliminating the need for excessive manual balancing.