Which type of sprinkler head is designed to release water through all outlets when activated?

• A. Pendant sprinkler head
• B. Deluge head
• C. Upright sprinkler head
• D. Concealed head

Answer: (B)

Deluge heads are used in deluge sprinkler systems where every head is connected to open piping. When the system is activated, water is released into the entire network, so it flows through all sprinkler outlets at once. This provides immediate, full-coverage suppression, which is why all heads discharge water simultaneously. In contrast, pendant and upright heads operate in more common wet- or dry-pipe configurations, releasing water only through the heads that are activated by heat, and concealed heads release water through the individual head after the cover plate is compromised—not through every outlet.