Discharge devices for foam-water wet pipe, dry pipe, and preaction systems shall be automatic in operation and non-air-aspirating.

• A. Manual In Operation and Air-Aspirating
• B. Automatic In Operation and Air-Aspirating
• C. Non-Air-Aspirating but Manual Operation
• D. Automatic In Operation and Non-Air-Aspirating

Answer: (D)

In foam-water systems, you want the foam discharge to happen automatically whenever the system is activated, so the fire is addressed without waiting for someone to turn a valve. Automatic discharge devices ensure foam concentrate is introduced into the water stream at the same time as the water flow begins, providing rapid, reliable foam delivery.

Non-air-aspirating devices are required because introducing air into the discharge stream can disrupt the planned foam concentrate proportions and foam quality. Air-aspirating components can also be more prone to clogging or instability, which undermines the effectiveness of the foam solution. Using non-air-aspirating discharge devices helps maintain consistent foam performance and system reliability across foam-water wet-pipe, dry-pipe, and preaction configurations.