Which type of assembly must undergo forward flow testing?

The requirement for forward flow testing is specifically applicable to backflow prevention assemblies. This process is crucial because backflow prevention assemblies are designed to protect the public water supply from contamination or pollution that could occur if water were to flow backward into the potable water system.

Forward flow testing ensures that the device is functioning properly and preventing any backflow when water flows in the intended direction. During this test, the device is assessed for its ability to maintain pressure and resist backpressure or siphonage, confirming that it effectively prevents any potential backflow incidents.

By conducting this test, it ensures compliance with safety standards and regulations that protect public health, which is a primary objective of NFPA 24 guidelines. Other assembly types, such as check valves, pressure relief valves, and flow control valves, have different testing protocols and requirements that do not specifically involve forward flow testing or are not subject to the same regulatory scrutiny regarding backflow prevention.