The Viking Model GN200/90 and GN200/180 Grate Nozzles® are designed for the protection of aircraft hangars and helipads. The 90° and 180° nozzles are installed on the edge of the helipad and spaced so their discharge will cover the entirety of the helipad. The 90° and 180° nozzles are utilized in aircraft hangars in conjunction with the 360° nozzle where a 360° discharge pattern is not desired (i.e., within 5’ of exterior wall or door per NFPA 409). The Grate Nozzle® is an AFFF foam discharge device located at the floor level of an aircraft hangar or helipad.