Master streams are ______ ______ fire streams delivered by either fixed or portable appliances.

Master streams are ______ ______ fire streams delivered by either fixed or portable appliances.

• A. Pressure driven
• B. Flow driven
• C. Volume driven
• D. Rate driven

Answer: (C)

Master streams are designed to deliver a large volume of water. The effectiveness of these streams comes from the sheer amount of water they put on the fire, which cools the area, replaces hot gases with steam, and helps knock down flames from a distance. Because they rely on large-diameter nozzles and high flow, they’re typically operated at moderate nozzle pressures to maximize gallons per minute rather than pushing for the highest pressure possible. That’s why they’re described as volume driven: the key factor is the total water volume delivered, not just the pressure or the rate alone.

Master streams are designed to deliver a large volume of water. The effectiveness of these streams comes from the sheer amount of water they put on the fire, which cools the area, replaces hot gases with steam, and helps knock down flames from a distance. Because they rely on large-diameter nozzles and high flow, they’re typically operated at moderate nozzle pressures to maximize gallons per minute rather than pushing for the highest pressure possible. That’s why they’re described as volume driven: the key factor is the total water volume delivered, not just the pressure or the rate alone.