What is a typical nozzle pressure range for a fog nozzle used on a 1.75- or 2.5-inch attack line?

• A. Usually around 60 psi
• B. Usually around 100 psi, depending on nozzle type and GPM; confirm with manufacturer.
• C. Usually around 200 psi
• D. Usually around 1500 psi

Answer: (B)

The main idea here is that nozzle pressure for fog nozzles on handlines is not a fixed number; it’s determined by the nozzle design and the desired flow rate. Fog nozzles are engineered to perform best at specific pressures that match their internal flow paths and spray patterns. On 1.75- or 2.5-inch attack lines, you choose the nozzle and target flow, then use the pump to maintain the pressure that the nozzle manufacturer specifies for that combination. Because different nozzle models and GPM targets exist, the exact nozzle pressure can vary, so you should always check the manufacturer’s data for the correct setting. This is why the best answer emphasizes that the pressure depends on the nozzle type and the flow, and that you confirm it with the nozzle’s manufacturer. The other options imply a single fixed pressure, which wouldn’t accommodate the variety of nozzles and flows used in practice and could lead to suboptimal performance or damage.