Which types of foam systems are permitted by NFPA 11?

Which types of foam systems are permitted by NFPA 11?

• A. Portable only.
• B. Portable, fixed and Semifixed.
• C. Fixed only.
• D. Semifixed only.

Answer: (B)

NFPA 11 recognizes three foam-proportioning approaches: portable, semifixed, and fixed. Portable systems mix foam concentrate with water at the point of use using portable containers and eductors or nozzles, offering flexibility where permanent installations aren’t practical. Semifixed systems have proportioning equipment set up in a fixed location (often on a skid or cabinet) while the foam concentrate is stored nearby and can be moved with the equipment if needed, giving a balance between mobility and reliability. Fixed systems have permanently installed proportioners and piping with on-site concentrate storage, delivering the most permanent and rapid response. Because NFPA 11 allows all three configurations, the correct choice includes portable, fixed, and semifixed.

NFPA 11 recognizes three foam-proportioning approaches: portable, semifixed, and fixed. Portable systems mix foam concentrate with water at the point of use using portable containers and eductors or nozzles, offering flexibility where permanent installations aren’t practical. Semifixed systems have proportioning equipment set up in a fixed location (often on a skid or cabinet) while the foam concentrate is stored nearby and can be moved with the equipment if needed, giving a balance between mobility and reliability. Fixed systems have permanently installed proportioners and piping with on-site concentrate storage, delivering the most permanent and rapid response. Because NFPA 11 allows all three configurations, the correct choice includes portable, fixed, and semifixed.