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cFCTlrJN IV–SYSTEM DESIGN UL EX. 5174 10-31-97 Page 4-10 DETECTION SYSTEM REQUIREMENTS Once fhe fire suppression system design has been determined, a Detector Placement Requirements detection system design must be completed.This section contains EXHAUST DUCTS guidelines and limitations for the detection system. Each exhaust duct must have at least one detector instalied in the Detector ldentification duct entrance, located in the airstream of the cooking vapors,or at The two types of detectors are distinguished from each other by a maximum of 20 ft. (6 1 m) into the duct opening See Figure 18 their location in the detection system. 1 The Terminal Detector(Part No 15375, or 417368) is the last in a series of detectors, or the only detector used in a single- �_�_� detector system.This detector is thus named because it is at =—=ii � � �-=-=_= the point at which the wire rope ends, or"terminates" 2.A Series Detector(Part No 15373,or 417369)is any detector located in-line between the regulated release mechanism and I the terminal detector zo Fr.�s m� MAXIMUM Detector/Pulley Elbow Quantity The quantity of detectors used in the system wiil vary depending on the style of detector used. 1 Conduit runs,puliey elbows,and number of detectors per sys- tem must be within the approved system parameters.The fol- lowing requirements must not be exceeded: Maximum Maximum Maximum —_—_ - - - --- Number of Number of Length of 1/2 Detectors Elbows in. Conduit FIGURE 18 per System �er Skstem �er System '�"��' Hinge Style 5 8 103 ft. (31 3 m) NOTICE Detector When gas appliances are used and the flue gases from the burner are exhausted into the Scissors Style 15 20 150 ft. (45 7 m) duct, the detector must be kept out of the air Detector stream of these exhaust gases. These gases 2. If hinge style detectors are mixed in a system with scissor can be very hot and could actuate the system style,4 series and 1 terminal is the maximum number allowed unnecessarily 3 If hinge style detectors are mixed in a system with scissor Duct openings that are long and narrow or large style, the maximum length of wire rope must not exceed 1 Q3 enough to require multiple duct nozzles may ft. (31 4 m) and the maximum number of puiley elbows must require additional detectors. not exceed 8. ELECTROSTATIC PRECIPITATOR If an electrostatic precipitator is located at or near the base of the exhaust duct, it is necessary to locate a detector below the pre- cipitator, at the base of the duct, and also locate one in the duct. just above the precipitator. See Figure 19 When installing the detector bracket and system conduit, make certain they do not interfere with the operation of the precipitator � , i � � FIGURE 19 �CJ?68