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Dropouts are essentially gravity operated acrylic double dome single leaf smoke vents with domes which are designed to automatically drop out in the event of a fire which reaches in excess of 500F. These units are equipped with a UL/FM fusible link activated cable release system that will cause the domes to drop out when a certain temperature is achieved and can also be used in conjunction with a building's early surpression system.
ESSLDOUL Product Data Sheet
AutoCAD Drawing (PDF)