What is a deck gun or portable monitor, and when is it used in exterior operations?

• A. A large-capacity water delivery device used for exterior suppression on large fires or exposures when interior access is limited.
• B. A small handheld spray nozzle used for interior suppression.
• C. A device used to monitor wind effects.
• D. A ladder accessory for reaching high windows.

Answer: (A)

Deck guns and portable monitors are large-diameter water delivery devices mounted on a fire engine or portable frame that can project a high-volume water stream from the outside. They’re used during exterior operations when interior access is restricted or hazardous, such as with a large fire or when protection of exposures is needed. By delivering a powerful, concentrated stream from outside, firefighters can knock down flames quickly, cool exposed areas, and create a safer window for interior crews to operate or for the fire to be controlled from a distance. This approach is distinct from interior suppression with handlines, and it isn’t a wind-monitoring device or a ladder accessory.