Deluge sprinkler systems are characterized by which feature?

• A. All sprinkler heads are open
• B. Only one head is open until activated
• C. Piping contains air before release
• D. Sprinklers are all closed until water release

Answer: (A)

Deluge systems are built so every sprinkler head is open. When the system is activated, water is released into the piping and flows out of all heads at once, providing immediate, wide-area coverage. This makes them ideal for high-hazard environments where a quick, complete distribution of water is required. The other descriptions describe conditions that don’t match a deluge setup: having just one head open or heads remaining closed until release would not deliver water everywhere at once, and piping containing air before release aligns more with other system types rather than a deluge.