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<br />'IP <br /> <br />t <br /> <br />'i. <br /> <br /> <br />" <br /> <br /> <br />3"-6" FROM HOOD <br />6 DUCT INTERFACE TO <br />NOZZLE THREADS <br />NEAR WRENCH HEX <br /> <br />75" PERIMETER <br /> <br />Figure 3-21 <br /> <br />SP-2 Nozzle placement in a <br />duct of up to a maximum of 75 <br />Inches in perimeter. <br /> <br /> <br />TI./O SP-2 duct nozzles can be used to protect one <br />duct of up to 150 perimeter-inches or two separate <br />ducts of up to 75 perimeter-inches (See Figure <br />3-22). <br /> <br />Four SP-2 duct nozzles can be used to protect one <br />duct of up to 300 perimeter-inches (See Figure <br />3-23); or two separate ducts of up to 150 perimeter- <br />inches; or four separate ducts of up to 75 <br />perimeter-Inches. <br /> <br />If risers exist they must be protected as ducts of <br />equivalent size. <br /> <br />If more than four duct nozzles are required, SP-2 <br />plenum nozzles may be used with the same <br />coverage limitations as stated for the SP-2 duct <br />nozzles. However, using plenum nozzles for duct <br />coverage will diminish the amount of plenum <br />coverage available. <br /> <br />:, - 8 <br /> <br />r~L <br /> <br />.!.L <br />2 <br /> <br />. I l <br />4L <br /> <br />. <br /> <br /><t. <br /> <br />f-.!.L-L.!.L-j <br />4 I 4 <br /> <br /><t. <br />NOZZLES SHOULD BE <br />CENTRALLY LOCATED <br />ON THE 1/4 POINTS <br /> <br /> <br />3" - 0" FROM HOOD <br />AND DUCT <br />INTERFACE TO <br />NOZZLE THREADS <br />NEAR WRENCH HEX <br /> <br />ISO" PERIMETER <br /> <br />. <br /> <br />Figure 3-22. <br /> <br />SP-2 Nozzle placement in a <br />duct of up to a maximum of <br />150 inches in perimeter. <br /> <br /> <br />300" PERIMETER <br /> <br />Figure 3-23. SP-2 Nozzle placement in a <br />duct of up to 150-300 inches in <br />perimeter. <br /> <br />. <br /> <br />UL Ex 2153 <br />1 November 1981 <br />