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-, Chapter 3-System Design Page 3-2 � � Revision 5 1 � � FOR CIRCUMFERENCES 0 to 50°(0-127 cm): � i MAXIMUM DIAMETER SHALL NOT EXCEED � I 16"(41 cm); \\ I - --- --- FOR GIRCUMFERENCES 0 to 150"(0381 cm) aERIME7ER NOZZLE TIP � �USlNG THE N-2W:MAXIMUM DIAMETER MEA9UREMENT—� ------- � GENTERED, � � SHALL NOT EXCEED 47-112"(121 cm). 1/2 WAY INTO AIMED INTO DUCT TRANSITION NOZZLETIPCENTERED, I NOZZLETIPCENTERED, � � I AIMED INTO DUCT � AIMED INTO DUCT ' � „Zw � , Figure 3.3. � ---, W � ��2 W�, Proper Measurement And Nozzle -- --- -- -------- - ; (� ; � Placement For Larger To Smaller Transition Ducts. lT�—t/2 L I-�-112 L-r l�—�� `-'" Smaller to Larqer Duct Transitions FOR PERIMETERS 0 to 50"(0-727 cm):LONGEST SIDE SHALL NOT EXCEED 16-3f4"(42.5 cm); FOR PERIMETERS 0 to 150"(0381 cm)USING THE To determine the ro er covera e for ducts that have a N-2W:LONGEST SIDE SHALL NOT EXCEED 50"(127 cm). P p 9 VIEW OF DUCT CROSS-SECTIONAL AREA smaller opening into the plenum than the final exhaust duct, measure the perimeter of the final exhaust,duct. Figure 3-2. The nozzle will be located as per standard duct Proper Duct Nozzle Placement coverage at the duct/plenum intertace and aimed at the center of the duct opening. See Figure 3.4 The Model N-2W noule is a two (2) flow point nozzle that can protect a square or rectangular duct of FERIMETER _I___ MEASIIREMENT � unlimited length and changes of direction with a � maximum 150" (381 cm) perimeter and a maximum one I side length of 37-1/2"(95 cm) (square)and 50" (127 cm) � (rectangular) respectively. It can also protect a round � duct with a maximum circumference of 150" (381 cm) (47-1/2" (121 cm) maximum diameter) See Figure 3-1 Figure 3.4. and 3-2. Proper Measurement And Nozzle Placement For Smaller To Larger Transition Ducts. Ducts Larqer than 150" (381 cm) Perimeter Upper/Lower Plenums For ducts with perimeters larger than 150° (381 cm), more than one Model N-2W nozzle must be used. When protecting exhaust hoods with multiple risers When using multiple Model N-2W noules to protect a (upper / lower plenums), each riser must be protected single duct, the cross sectional area of the duct must be as an individual duct. See Figure 3.5 divided into equal symmetrical areas. Each nozzle must � � then be installed in the center of the area it is protecting and aimed directly into the duct opening. No,cross sectional area can exceed the sin le nozzle covera e. � 9 9 _ � � � � � DUCT �I�� ! Transition Ducts ' — PLENUM Protection of any non-standard duct should be Figure 3.5. discussed and agreed upon with the local authority Upper 1 Lower Plenum Protection having jurisdiction before proceeding with any system Electrostatic Precipitators installation. Typically, transition ducts are protected in the following manner , Ventilation systems that utilize electrostatic precipitators Larqer to Smaller Duct Transitions require duct protection above and below the precipitator. Standard duct nozzles are used for this application. To determine the proper coverage for ducts that have a See Figure 3.6. � , NOIILE larger opening into the plenum than the final exhaust , duct, measure the perimeter of the duct half way between the largest and smallest cross sectional areas. I` � PRECIPITATOR The nozzle will be located as per standard duct ��' coverage at the ducUplenum intertace, rather than at the � No��E PLENUM - point of ineasurement, and pointed into the duct, aimed � _� � at the center of the final.duct opening. See Figure 3.3. Figure 3.6. Electrostatic Precipitator Protection. r ULEX 6885 ULC-EX 6885 BPN: BFR-TM January 1, 2013 �