Discharge devices for foam-water deluge and spray shall be permitted to be air-aspirating, or they shall be permitted to be non-air-aspirating.

Discharge devices for foam-water deluge and spray shall be permitted to be air-aspirating, or they shall be permitted to be non-air-aspirating.

• A. Air-Aspirating Only
• B. Non-Air-Aspirating Only
• C. Either Air-Aspirating or Non-Air-Aspirating
• D. Neither Type Is Permitted

Answer: (C)

Both air-aspirating and non-air-aspirating discharge devices are allowed for foam-water deluge and spray systems. The design standard provides flexibility: you can use either type as long as the device chosen is appropriate for the foam concentrate and the system’s requirements. Air-aspirating devices mix air into the foam solution at discharge to achieve greater foam expansion and better coverage in some situations, while non-air-aspirating devices discharge the foam solution without adding air, which can be suitable for other concentrates or applications. The key is that the selected discharge device must meet the system’s foam performance needs and be properly integrated with the foam concentrate, proportioning, and overall system design.

Both air-aspirating and non-air-aspirating discharge devices are allowed for foam-water deluge and spray systems. The design standard provides flexibility: you can use either type as long as the device chosen is appropriate for the foam concentrate and the system’s requirements. Air-aspirating devices mix air into the foam solution at discharge to achieve greater foam expansion and better coverage in some situations, while non-air-aspirating devices discharge the foam solution without adding air, which can be suitable for other concentrates or applications. The key is that the selected discharge device must meet the system’s foam performance needs and be properly integrated with the foam concentrate, proportioning, and overall system design.