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<br />'r;' <br />rll <br /> <br />Sf;CTION IV - SYSTEM DESIGN <br />UL EX. 3470 11-1-94 Page 4-8 <br /> <br />.,0 <br />1 <br />" <br /> <br />NOZZLE PLACEMENT REQUIREMENTS (Continued) <br />Plenum Protection (Continued) <br /> <br />,;~,...I,.. <br />~> <br />~ . j <br />i <br /> <br /> <br />11 <br />." <br /> <br />i' <br />I <br />i <br />., <br />i ' <br />t : ~ <br />~ 'j <br />!" <br /> <br />NOZZLE TIP <br />MUST BE WITHIN <br />THIS AREA <br /> <br />FIGURE 26 <br /> <br /> <br />1 N NOZZLE - PART NO. 56930 <br /> <br />One 1 N nozzle will protect 8 linear feet (2.4 m) of single filter <br />bank plenum or two 1 N nozzles will protect 8 linear feet (2.4 cm) <br />of "V" bank plenum. In either application, the nozzle(s) must <br />be mounted in the plenum, 2to 4 in. (5 to 10 cm) from the face <br />of the filter, centered between the filter height dimension, and <br />aimed down the length. The filter height must not exceed 20 <br />in. (51 cm). See Figure 27. <br /> <br /> <br /> <br />il <br />r,! <br />.' <br /> <br />8 FT. (2.4 m) <br />MAXIMUM <br /> <br />~i <br /> <br />1~ <br />~i <br /> <br />I <br />:1 <br />'1 <br />I, <br /> <br />1:' <br /> <br />,j <br /> <br />II <br /> <br />~ <br />/1~> <br /> <br />2-4IN. <br />(5-10 em) <br /> <br />, <br />I" <br /> <br />./ 2-4 IN. <br />(5-10cm) <br /> <br /> <br />I <br />j <br /> <br />FIGURE 27 <br /> <br />Exception: When the plenum chamber containers filters that do <br />not exceed 10 in. (25.4 cm) in height and the 1 N nozzle can be <br />installed at the intersecting center lines of both filter banks and <br />not exceed the 2-4 in. (5 to 10 cm) distance from either filters, <br />a single 1 N nozzle can be used. See Figure 27a. <br /> <br /> <br />10 IN. (25.4 em) <br />MAXIMUM <br /> <br />FIGURE 27a <br /> <br />NOTICE <br /> <br />If 1 N nozzle coverage does not exceed 7 linear <br />ft. (2.1 m), the nozzle can be mounted 2 to 6 <br />in. (5-15 cm) from the face of the filter. <br /> <br />For a plenum, either single or "V" bank, with a linear extension <br />longer than 8 feet (2.4 m), each bank may be protected using <br />one 1 N nozzle every 8 ft. (2.4 m) or less depending on the overall <br />length of the plenum. See Figure 28. The nozzles may point in <br />the opposite directions as long as the entire plenum area is pro- <br />. tected, and the 8 ft. (2.4 m) limitation is not exceeded. See Figure <br />29. The nozzle positioning shown in Figure 30 is not an accept- <br />able method of protection because the plenum area directly. <br />under the tee is not within the discharge pattern of either nozzle. <br /> <br /> <br /> <br />FIGURE 28' <br /> <br />