In exterior operations, when is a deck gun particularly useful?

• A. Suppression on large fires or exposures when interior access is limited.
• B. Delivering water to interior crews.
• C. Lifting personnel to upper floors.
• D. Testing pump pressure.

Answer: (B)

Deck guns are a high-volume exterior water delivery tool. Their purpose is to apply large amounts of water quickly from outside the building, which is especially valuable on big fires or when access inside is blocked or unsafe. By delivering a powerful master stream from the exterior, you can knock down flames, protect exposures, and buy time for interior crews to operate or for conditions to improve. This makes them the best choice when interior entry is limited or not yet feasible.

Delivering water to interior crews isn’t the primary role of a deck gun; interior water is typically supplied by handlines or standpipes and managed by the interior attack team. A deck gun’s fixed, high-volume stream isn’t suited for precise interior positioning and can complicate interior operations. Lifting personnel and testing pump pressure aren’t functions of a deck gun either.