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SECTlON!—GENERAL lNFORMATION <br /> . UL EX.5174 10-31-97 Page 1-3 <br /> DEFINITION OFTERMS(Continued) <br /> Terminal Detector: The last in a series of detectors, or the only <br /> detector used in a single-detector system. This detector is thus <br /> named because it is at the point at which the wire rope ends, <br /> or"terminates."There is only one terminaf detector per detection <br /> system. <br /> Thru Tee: A thru tee is defined as a tee positioned in the system <br /> so that as the flow enters a side inlet and exits straight through the <br /> tee to the outlet opposite and also exits 90° through the center <br /> outlet. <br /> Transition: An extension of the hood or canopy which allows for <br /> the smooth transmission of gases, air, and vapors between the <br /> hood opening and the base of the ventilation duct. <br /> Vent Plug:A device used to prevent pressure build-up within the <br /> agent tank or agent distribution lines due to temperature fluctua- <br /> tions. <br /> Water Flow Valve: A specially-designed valve located within the <br /> ANSUL AUTOMAN Regulated Release and the Regulated <br /> Actuator which controls the flow of water following the agent <br /> discharge. <br />