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 included evaluation of prototype fire detection and suppression methodologies and equipment. A fire proximity suit is a suit designed to protect a firefighter from high temperatures, especially near fires of extreme temperature such as aircraft fires. Fire proximity suits first appeared during the 1930s, and were originally made of asbestos fabric (hence also known as the asbestos suit). Today they are manufactured from vacuum-deposited aluminized materials that reflect the high radiant loads produced by the fire.