What are the two system types defined by NFPA 16?

• A. Foam-water sprinkler systems and foam-water spray systems.
• B. Wet-pipe foam systems and dry-foam systems.
• C. Foam-water sprinkler systems and air-foam spray systems.
• D. Foam-only sprinkler systems and water-only spray systems.

Answer: (A)

NFPA 16 defines two system types based on how the foam-water mixture is delivered. The foam-water sprinkler system releases the foam-water through traditional sprinkler heads in the protected area, using the piping network to discharge the foam at discrete points. The foam-water spray system uses spray nozzles to apply the foam-water as a spray, creating a more uniform foam blanket over the hazard. The distinction is about delivery method and coverage pattern, not about different foam concentrates or separate technologies.