How does a reverse return system differ from a direct return system, and what are the benefits?

A reverse return system is piped so that the length of the water circuit through the supply and return piping to each fan coil or air handler is essentially the same. This design approach eliminates the need for balancing valves, as the flow rate at each fan coil unit or air handler is inherently balanced due to the equal piping lengths. Reverse return systems can provide more even cooling or heating performance across different areas of the building, but may require more complex piping designs and higher upfront costs.