Florida Fire Inspector 1 Practice Exam

Operating pressure is the driving force that pushes water through the tiny nozzles to create a fine mist. If the pressure is too low, atomization fails and droplets are too large, reducing effectiveness. If it’s too high, you waste water and may stress components. Ten psi is a typical target for low‑pressure misting systems because it provides enough energy to produce a fine mist with common nozzle sizes without demanding more complex or larger equipment. Five psi is usually insufficient for consistent atomization, while fifteen or twenty psi, though usable in other designs, aren’t the standard for the common low‑pressure configurations referenced here.