What are some common applications where direct return systems are preferred over reverse return systems?

Direct return systems are often preferred in applications where piping costs are a significant concern, such as in large commercial or industrial buildings with extensive piping runs. They are also commonly used in retrofit projects where existing piping infrastructure needs to be reused or modified. Additionally, direct return systems may be preferred in applications where simplicity of design and installation is a priority, such as in smaller buildings or in areas with limited access.