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! : -- -- - - � -- � -- ---- <br /> i • . <br /> ' SECTiON IV — SYST6M DESIGN <br /> UL EX. 3470 ULC CEx74T Pege 4-4 <br /> kev. s 3-1-04 <br /> � Transitlon Protecllon <br /> 7ransltlona era protecled et a point In the lranettlon where Uie <br /> � � perimelar or the diemeler Is equai to or less ihan ih� mexlmum The 1/2N noule (Patt No. 419334) must be cenlered 10 to ZG in. <br /> � size duct lhal can be prolecled The noule musi be loceied fa �io (25 l0 88 cm) below 1he practpftetor end almed lo dlscharge at fhe <br /> cenler ot the transltlon opening where lhe maxlmum perimeter or cenler of each preclpllator ceil. Howevar, ff it is physicaNy Impos- <br /> • dlemetef beglfls. SAe FlqUfe 4. albia [v nwunl flie noula at '!0 to 20 In. (25 to 88 cm) due to pre. <br /> cipllalorplacemenl, Ihe noula may be mountad closer than 10 in. <br /> (26 cm). 3ea FlQure 6. <br /> i <br /> oucr <br /> �, � <br /> rruNSmoN <br /> I � r BEE WC7 FOH <br /> � i� NOIIIE 1 7RAN91710N <br /> ^ � � PROTECTION <br /> � � <br /> P.R6CIPIIMUH^ <br /> � �-201N.' <br /> I cze-ee �m� <br /> FIQURE 4 �.�, <br /> oron. i <br /> nou�e Foa <br /> Electrostallc Proclpl[atorProtecllu�i rlto7E0iAoNR <br /> Some reslauranl venqlating ducts have en eleclroaletla preclplle- � <br /> lor installed el or near Ihe base. These preclpllelors ere used lo .�pNY81CALLY1MP09SiBl8AT 10 TO YB IN. (25 TO 88 cm), NOZZLE MAY.BE MOUNT- � <br /> ald ln the cleaning of exhausl alr. eoctiosexn+�wmw.�:a�,�. <br /> Normally electroslallc preclpllalors do not requlre protecllon but FIGUR QE�M i <br /> should Ihe 'aulhoriry tiav(ng Jurlsdlcllon" requlre prolacllon, uae " I <br /> ihe foliowing guldeltnes. ,' <br /> Ducls wllh preclplletore loasled a! or near fhe hase can be pro + <br /> lecled using duct nozzle(e) above the preclplletor and 1/2N noz- <br /> zle(s) (Part No, 4i9334) tor lhs precipitetor. One tl2N nozzle must ' <br /> ba used for eech cel! being proiecled. Thla nozzle Ifp !a slemped ' <br /> w�tn snN, indir.a�inp that !t Is e 1/2-8ow noule end musl ba.couni• � <br /> ed as 7/2 flow number. � <br /> When profecling ducts equlpped wilh precipllalore, Ih� duci noz- , ' <br /> zle{s) musl ba Inalef(ed above.the prec�pltelor and.ehned lo dis- ' <br /> chargA rtnwnstream. lf the area ebove fhe precipllelor ls e tluct, <br /> Ihe noule(s)• must ba poallloned acco�ding lo duct profectlon <br /> gufdeflnes. if the ares .above Ihe precipilaior (s e UeneUlon, fhe . <br /> � Iranslllon guidellnes must be lollowed. <br /> , <br />