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<br />MAXIMUM AND MINIMUM BASIC SYSTEMS <br /> <br />.' <br />.. <br /> <br />The maximum basic system, using a distributor, <br />consists of eight SW-2 appliance nozzles and a <br />total of eight SP-2 duct and plenum nozzles. <br />The minimum basic system, using a distributor, <br />consists of eight SW-2 appliance nozzles and a <br />total of four SP-2 duct and/or plenum nozzles, <br />For maximum and minimum extended systems, <br />see Section 6 of this manual. <br /> <br />PLENUM NOZZLE COVERAGE <br /> <br />Maximum Piping. Eight SP.2 Nozzles <br />With maximum piping, using eight SW-2 nozzles <br />and eight SP-2 nozzles, and assuming that four <br />SP-2 nozzles are used for duct protection and four <br />SP-2 nozzles are used for plenum protection, the <br />following plenum coverages are possible. <br />(1) A plenum of up to 48 feet long and 4 feet <br />wide can be protected by placing two SP-2 <br />nozzles, back-to-back, located on the quarter <br />points of the plenum length (See Figure 3-12). <br /> <br />:. <br /> <br /> <br />Figure 3-12. Four SP-2 nozzles can protect one <br />plenum of up to 48 feet long by 4 feet <br />wide. <br /> <br />. <br /> <br />NOTE: SP-2 nozzles must be attached direct- <br />ly to T2. <br />In this configuration, each SP-2 nozzle pro- <br />tects a plenum area 12 feet long by 4 feet <br />wide. <br />(2) Two plenums of up to 24 feet long and 4 feet <br />wide can be protected by two SP-2 nozzles, <br />back-to-back, centered in each plenum (See <br />Figure 3-13). <br /> <br />UL Ex 2153 <br />1 November 1981 <br /> <br />, -"",--.- <br /> <br /> <br />(0) <br /> <br />Figure 3-13. Four SP..2 nozzles can protect two <br />plenums., each 24 feet long by 4 feet <br />wide. <br /> <br />(3) Four plenums of up to 12 feet long by 4 teet <br />wide can be protected by entering each <br />plenum from the end (See Figure 3-14). <br /> <br /> <br />Figure 3-14. Four SP-2 nozzles can protect four <br />plenums, each 12 feet long by 4 f.eet <br />wide. <br /> <br />In configurations (2) and (3), each SP.2 nozzle also <br />protects a plenum area 12 feet long by 4 feet 'I ide. <br /> <br />Intermediate Piping. Six SP.2 Nozzles <br /> <br />With piping using eight SW.2 nozzles and six "',P-2 <br />nozzles, again assuming four SP-2 nozzles for <br />duct protection and two SP-2 nozzles for plenum <br />protection, the following plenum coveragefi are <br />possible. <br /> <br />3-5 <br />