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, . � ; <br /> � <br /> Chapter 3—System design � <br /> i � <br /> B.PLENUM PROTECTIaN � Figure <br /> The NL1H nozzle is a one(1)flow nozzle used for plenum i 3-8. <br /> � protection.A single NLIH nozzle can protect a glenum{with <br /> � single or V-bank filters) 10£t.long by 4 ft.wide.Dividing the � <br /> length into sections equal to or Iess than 10 ft.in length and <br /> positioning a nozzle at the start of each section can be done to f <br /> protect longer plenums. ! io'MAX. <br /> On V bank plenums,the nozzle(s)must be located at the center � �o�MAx. <br /> of the V-bank width,1!3 of the vertical height af the filters.On � <br /> o°TO 6" <br /> single filter bank plenums,the nozzle must be located 2 in.from <br /> the back edge of the filter,1!3 dawn from the vertical height_ <br /> �' For either application,the nozzIe must be located within 6 in.of ' <br /> the end of the plenum(or madule)and aimed directly down the <br /> Iength of the plenum.See Fig.3-8. <br /> i W <br /> � t12 W <br /> � <br /> 1/3 H <br /> � <br /> � H <br /> V-BANK <br />� <br /> i <br /> . 1t3 H <br /> 1' <br /> H I„�_ <br /> ; 21 <br /> SINGLE BANK <br /> I <br /> ����= ,, .- <br /> �;-�-:i. 1 �%-"'`�� <br /> �,. <br /> �GE`�': - <br /> �,��� , �''- 9�,�.�� <br /> UL EX4521 December 12,2006 13 Page rev.C <br /> Part#10053 <br /> � <br />