NIST researchers are working with the U.S. Naval Facilities Engineering Command and five manufacturers from the automatic fire alarm and sprinkler industry in an effort to develop information needed to design fire safety plans specifically for high-ceiling structures, such as aircraft hangars, hotel atriums, and warehouses. A research team assembled by the cooperating organizations conducted 35 full-scale experiments in two Navy aircraft hangars located in Hawaii and Iceland. Data were collected on the movement of smoke and heat in two high bay hangars for a variety of fire sizes, using various jet aviation fuels, and with both open and closed hangar doors. The tests also incuded evaluation of prototype fire detection and suppression methodologies and equipment.