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<br />.. Duct Protection - Multiple Nozzle (Continued) <br /> <br />I DUCT.SIZES GREATER THAN 135 IN. (343 cm) PERIMETER I <br /> <br />. Ducts over 135 in. perimeter must be modularized using 2W <br />nozzles (Part No. 419337) <br /> <br />. No round duct option available <br /> <br />. Follow the design chart to determine maximum module size for <br />each 2W nozzle <br /> <br />. When determining number of nozzles required, it is sometimes <br />an advantage to check the chart using the shortest side as Side <br />.An and then recheck it using the longest side as Side nAn. This <br />comparison may reveal a need for a lesser quantity of nozzles <br />one way versus the other way. <br /> <br />When working with Chart 1, the quantity of nozzles determined <br />must be equally divided within the duct area. <br /> <br />CHART NO.1 <br />B <br />AI- - -I <br /> <br />SIDE .B" <br /> <br />SECTION IV - SYSTEM DESIGN <br />UL EX. 3470 ULC CEx747 Page 4-3 <br />10-1-02 REV. 4 <br /> <br />"When working with Chart 2, one half of the quantity of nozzles <br />determined must be equally positioned in the top half of the area <br />of the duct and the remaining half of the nozzles must be posi- <br />tioned in the bottom half of the duct area. <br /> <br />Example: The duct to be protected has a Side nAn of 40 in. and a <br />Side "S" of 60 in. Referring to the design chart, this duct requires <br />4 nozzles. One half of 4 = 2. Therefore, 2 nozzles must be equal- <br />ly positioned in each of the two duct areas. See Figure 3. <br />SIDE "B" <br />30 IN. (76 mm) 30 IN. (76 mm) <br /> <br />20 IN. <br />(51 mm) <br /> <br />I _ r <br /> <br /> <br />I 40 IN. <br />---- - - - - -- (102mm) <br /> <br /> <br />i · J <br />.1 <br /> <br />- <br /> <br />SIDE <br />"A" <br /> <br />20 IN. <br />(51mm) <br /> <br />. <br /> <br />I. <br /> <br />60 IN. <br />(152mm) <br /> <br />.. <br /> <br />FIGURE 3 <br />006523 <br /> <br /> 25 26 27 28 29 30 31 32 33134 35 36 37 38 39140 41 42 43 44 45 46 47148 49 50 51 52 53 54 55156 57 58 59 60 61162 63 64 65 66 67168 69 70 711 72 <br />~ r <br />5 <br />~ r <br />7 <br />e!- r <br />9 <br />~ 1 r r <br />11 <br />~ r W <br />13 <br />J! r l-1 <br />15 <br />4 r 2 r <br />17 <br />J! r ~ <br />19 <br />~ r f-J <br />21 <br />~ r r <br />23 <br />1i. r -l <br />25 <br />1! ~ 3 <br />27 <br />~ r - r <br />29 <br />1Q... - -1 <br />31 <br />B.. I 4 r <br />33 I I <br />~ 5 <br />35 6 <br />36 I 5 I 6 7 <br /> <br />SIDE <br />"A" <br /> <br />CHART NO.2 <br />B <br /> <br />A ~;--:--;~ <br /> <br />NOTE: NOZZLE QUANTITIES LISTED IN CHART 2 MUST BE EQUALLY DIVIDED INTO EACH OF THE TWO DUCT MODULES. <br /> <br />~ -l <br />37 <br />1! r r <br />39 <br />~ 2 I 4 f..J <br />41 <br />~ W - 6 <br />43 <br />~ r r <br />45 <br />~ ..J r f-J <br />47 <br />48 <br /> <br />.. <br /> <br />006522 <br />