Hello, I need to design a piping system with an array of nozzles 72mm apart in the horizontal and vertical direction to spray water and perform a rain test on the face of a large enclosure. The enclosure face has dimmensions of 8' X 20'.  What is the best piping configuration to use? We will probably be tapping into our fire hydrant for our water pressure. So basically a water main feeding a grid of nozzles in a square pattern. The nozzles must flow at 40 psi. Thanks in advance.