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SECT10Pf lV — SYSI'EM DESIGN UL EX3470 ULC EX3470 Page 4-4 AEV.7 7-1-09 YYansition Protection 7ransitions ara proteCted ai a point fn the transttlon where the The 1/21V nozzle(Part No.419334}must be centered 10 to 261n. perimeter or the diameler is equa!to or less than the maximum (25 to 66 cm�beiow the precipitator end almed to discharge at the �size duct thaf can be protected.The nozzle(s)must be focated in center of each precipitator ceil.However,if it Is physically imposst- the center ot the area at that point,or center ot it�e module pro- ble to rnount ihe nozzle at 1U to 26 in.(25 to 66 cm)due to pre- tected when more than one duct nozzle is required.Nate:Nozzles cipitator placement,the nozzle may be mounted closer ihan 10 in. to pratect ducts wfth a transftlon thet is more than 4 ft(1.2 m) (25 cm).See Figure 5. fn helght,wiQ be required to.be posltEonad in the opening of ihe transltton from the hood 2 to 8 En.(5.1 to 20.3 cm}fnto the opentng ustng standard duct noule design parameters.See .Figure 4. o� se�oucr Fop i rAnNSmok � DUCT �II�E PROTECTfON �� a TRqNSITION ��``� PRECIPITATOR � �� 4 FT � (1.2 m) 1428 IN' MAX. I (25-8e cm) > ` NOZZLE FOR PRECIPRATOA PROTEGTION •IF ptlyg�CALLY fMp03916LE AT t0 T026 If1,i28 TO B8 om),N07ZtE MAY B@ FIGUR�4 MOUNTEO CLOSEq THAry 7p IN.(25 cm). 000n. Electrostatic Precipitator Protection FIGURE 6 �� Some restaurant ventilating ducEs have an electrostatic reci ita- ,�ote:For prote�tion of PolluUon Conirol Units(PCUs)or air scrub- ►tor installed at or near the base.These prec(pitators are pene ar � �bers with or without ESPs, contact Ansul Technical Services(or ►smalE and are used to sid in the cleaning of exhaust air.g ry �n-UL Iisted recommended applicatfon. . Ducts with precipitators located at or near the base can be pro- tected using duct nozzle(s)above the precipitator and 1/2N noz- zle{s)(Aart No.419334}for the precipitator.One 1/2N nozzle must be used tor each celi being protected.This noule Up is stamped with 1/2N,indicating that it is a 1/2-Ilow nozzfe and must be count- ed as i/2 flow number. When protecting ducts equfpped with precipitators,ihe ciuct noz- zls(s) must be installed above the precipitator and aimed to dis- charge downstream,If the area above the precipitator Is a duct,the nozzle(s}must be positioned accordng to duct proiection guide- ilnes.If the area above ihe precipitator is a transition,the transitlon guidelines must be followed.