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• • Chapter 3 — System Design Page 3 -2 REV. 2 ■ Modularizing Ducts ' When working with Chart 2, one half of the quantity of nozzles determined must be equally positioned in the top half of the DUCT SIZES GREATER THAN 100 IN. (254 cm) PERIMETER area of the duct and the remaining half of the nozzles must be • Ducts over 100 in. perimeter must be modularized using Positioned In the bottom half of the duct area. 2D nozzles (Part No. 551038) Example: The duct to be protected has a Side "A" of 40 in. • No round duct option available and a Side "B" of 60 in. Referring to the design chart, this duct requires 4 nozzles. One half of 4 = 2. Therefore, 2 • Follow the design chart to determine maximum module nozzles must be equally positioned In each of the two duct size for each 2D nozzle areas. See Figure 3 -1b. • When determining number of nozzles required, It Is some- SIDE "B" times an advantage to check the chart using the shortest 30 IN. (76 cm) 30 IN. (76 cm) side as Side "A" and then recheck It using the longest side as Side "A ". This comparison may reveal a need for a 20 IN. • 1 • lesser quantity of nozzles one way versus the other way. (51 Om) When working with Chart 1, the quantity of nozzles deter- S A E � -- -- — — — -- 002 N. mined must be equally divided within the duct area. 2015 (51 cm) • CHART NO. 1 B ` 50 IN. T I (152 cm) A s o 10 Figure 3 -1b. SIDE "B" 0c6623 25126 27128 29130 31132 33)34 35136 37138 39190 41142 43144 45140 47148 49150 51152 53154 55156 57158 59160 61162 63164 65106 67108 09170 71172 5 5 1 6 8 y ID 1 12 13 1.1 r _J 15 1 16 r 2 7 --- 1 8 1 1 IB SIDE 0 1 " 10 J 21 22 2 r r . 24 25 1 25 3 27 28 29 r- 30 1 1 31 32 1 1 1 1 4 33 34 35 I i 5 36 t 6 1 6 7 CHART NO. 2 B • • • A - • • • NOTE: NOZZLE QUANTITIES LISTED IN CHART 2 MUST BE EQUALLY DIVIDED INTO EACH OF THE TWO DUCT MODULES. 36 J 37 30 39 40 2 4 f 41 42 43 6 47 45 46 • 07 — 1 48 006522 ULEX 3830 April 1, 2004 PN551274(2)