The Squall Wall is an easy-to-use device that creates a thin wall of water to help cool and protect structures. The user simply attaches the Squall wall to a water supply hose end, secures the fitting to the ground using a spike or two and starts the flow of water. The small, angled ramp helps direct the water flow up through the opening vent. The Squall Wall can create a wall of water up to 40 feet wide and 20 feet high. It is recommended that the user secure the unit with a spike or pre-fasten it to a 1x1' plywood plate for fast deployment. It can also be prepositioned and permanently mounted on rooftops, walls, gantries and even in tree. 1.5" NH. Specify 15 or 30 GPM.