Discharge devices and foam concentrates shall be listed for use together.

• A. When Compatible With Water Supply
• B. For Use Together
• C. Only With Certain Devices
• D. Not Required to Be Listed

Answer: (B)

The key idea is compatibility verified by listing. In foam-water sprinkler systems, the discharge devices (like foam outlets, nozzles, and eductors) must be tested and approved to work with specific foam concentrates. When a combination is listed for use together, it means a recognized testing laboratory has evaluated and approved that exact pairing, so the foam concentrate will mix correctly with water and pass through the discharge devices as intended. This ensures reliable foam quality, proper surge and drainage, and overall system performance.

Choosing the option that states they shall be listed for use with each other is the best answer because it explicitly requires that the components be evaluated together, not just generally compatible or used with water supply. Options suggesting compatibility with water alone, restricting to certain devices, or not requiring listing do not guarantee the necessary tested combination and could lead to improper performance or safety concerns.