ÿWPC5 Ù±+~Ø9è0ÒC¸8c…W”Òvëº1þauþûÓÈb^„Öy2;u˜ðWÛ¦~!'žNêÇÄíncêVLŽÎ³ÏPå'FOÙ”V–ZÄaŸ"5´…|1I×̓ÌOL: ¹ï¶ÃÊ%‡—7²‹Î;tz×ØÝžƒ×8'º"‚xbÅüýúàuÒ ïöC#J-›‘(r~…‰š·£Åæé"Ž Âv3Gm@ñ‘¢'BZ2k¿Îô*:?kv©®/.8ÃÜGíGĬË #D“zVŸr%$-ÙÀ6JXŒY' ÷ € 4¦úU®.Œ‹O@4³ÄëÒ}à•çh À®‡l/ÉØQá¿¥»šö7s\³ G·–³Ä«ƒá¯ÇH1:£¡{b–¾3.ý´×©t~xÊó\#Á É %Ö 0RÜ(.U :VV^ wœ4 ´ÃÆÅf‹a m¡¡ 0n¸N&&& D+(•SSSSU,èèèèèèèèèèè 0nE‚‚‚B„„„„„„„„„„„„MÆ 0nÊU>88U,vvvvvvvvvvvvvvvvv@ ¢oû¬¬¬¬ AŸ§3 0nF4F4 B´4´4 0KÑ4˜HP DeskJet 840C SeriesT(,,,,T(0 Ý ƒ/î'ÝÓ  ÓÓ °°—…°œXÓÝ  ÝÔ_ÔÓ  Óßn€VQ:*&`>©è!! `ÀœœE°X!!!!eX··nßâ  (# (#°(#°(#âà @¡ àà @& àà @« àà @0 àà @µ àà @: àà @¿ àà @D àà @É àà @N à€€à0 @Ó àÔ_ÔEPA„Ô_Ô452/F„03„004à @ç" àà @ç" àà @ç" àà @ç" àà @ç" àà @ç" àà @ç" àà @ç" àà @ç" àà @ç" àà @ç" àà @ç" àà @ç" àà @ç" àà @ç" àà @ç" àà @ç" àà @ç" àà @ç" àà @ç" àà @ç" àÔ‡Xõ…XòòÔÔ‡>XduXXXõ…ÔÑ @ ÑÐ X ÐÓ  ÓÓ?+Ü Ü4Œ ä <”ìDœôL¤ü!°°—…?ÓÔ#†>òU|òX>Xduœ#ÔÔ#†ò;òò>òU|»#Ôà t àà Ì àà $ àÌÌò òÔ‡ SŽòò;ÔÔ‡@ SŽ SŽÔÓ  Óà @t àAir€Pollution€Ô_ÔControl€TechnologyÔ_Ô€Ô_ÔÐ ˜@ ÐFactÔ_Ô€Ô_ÔSheetÔ#† SŽ@ SŽÓ#ÔÔ#†ò;ò SŽ´#ÔÔ‡ SŽòò;ÔÔ_ÔР؀ ÐÓòÓÓ  ÓÔ‡ SŽ SŽÔ€€Ô#† SŽ SŽ@#Ôó óÔ#†ò;ò SŽà#ÔÐ À ÐÓ  Óà t àà Ì àÔ_ÔÔ_Ôò(*c$¡¡Ó  ÓÓ °°—…°œXÓ,æ«) AZ‹"Arial RegularÖ™/â d,-c„À¿¤ò„3|xLevel 1Level 2Level 3Level 4Level 5ˆÇTABLE AÿU‹ÿÀÀÀ(F3/î$§§Ý ƒc!ÝÓ  ÓÓ °°—…°œXÓÝ  Ý'ÈÈÈÈdxd ‹Ý ƒ&/î)ÝÓ  ÓÓ °°—…°œXÓÝ  ÝÔ_ÔßA€Y-) °°xdEE°WxAßÐ X ÐòòÔ‡ô;òòòÔEPA„Ô_ÔCICAÔ_Ô€Fact€Sheetóóà€´´>(#àòòFabric€FilterˆÐ g Ðà€3(#àCartridge€Collector€TypeÔ#†ò;òòô;®#Ôóó,2ÇÝAZ‹Arial (F3/î$©©Ý ƒc!ÝÓ  ÓÓ °°—…°œXÓÝ  Ý 8ѰXÑÑÂÂÑÒ°°ÒÒ°°Ò<ÿÿ:Default ParaÔ‡XXXÔÔ‡XXXÔô\  `&Times New Roman,2ÇÝAZ‹Arial R ÿWPC__††††††__ ÿÀoŠ™œÿÿÿ0T#4\;c-C~%L„0R,S-]–:^—;ižHjžIt¥Vu¦W€­d­eŒ´rŒµs—¼˜¼£Ã£Ä®Ë¯ËºÒ«ºÓ¬ÆÚºÑáÇÒâÈÜéÕÝéÖèðãéñäóøñôøò-Q.T0V2[4_6f8i:m@zDF„Gˆ-O%,M)0P.5^:6g0BdDTxQrŽtv•w…ŸŠ9XF>\KC_Q±¢¤¸±ºÇ¿ÚáÜZqlª®²½Á->š.?š1A›¬/ž]jlfƒD‚jJD‚jJiYND…jg˜«/ ]jlfi`VgNƒjƒjVR‚jlJTYdš-ª/œ`jjGG‚jVVƒjgdƒj]RjjTiž)©/.5œlƒjGT`dƒjd]ƒjdiVljlViœ-ˆ/.ˆ/.ˆ/.Š/(6œYJVd‚]VgƒjVVƒji‚gRjjlV›6'.†/+ˆ/)ˆ/'+ˆ/)$=› fDd]NJjƒjVTƒj…dJjjDg™=$'-„/,%%,…/.)$+…/.)$$)-„/'$%Œ" djVTjNjD‚jJJ‚jG‡`Djf‹ "ˆ&$%)++*'ƒ$'*‚+(%‚$%(‚+)%„$(‚+'‚$ˆ / djVVjgVjdJ‚jJJ‚jJdl‚jƒJTŒ„/  …6¨$=…  „/Ž jTVjdVjdJ‚jGJ‚jJfl‡jg‹ ‡/ ƒ@%¦$„ ‡/Ž jJiVjVVJjdTƒjƒjRƒfƒdV`‰/ ‚5¦$9‚ ‰/Žl‡j`VƒjƒjVi]„VTN` Š/ @&¤$ Š/N‚jJJNVYiVƒjƒjVY‡jDŒ/ 7£$%? …/‚/‘fddf‚Vƒjƒj VfRJTJjVVDj ƒ/„/5¢$6…/ #‚/iJjV`‚jJVƒjƒjV„TjJjŽ ‚/ƒ „/  $5 „/ „‚/  Tjl`VjGDjgVƒjƒjVƒdljdJjŽ‚/…ƒ/1ž$:ƒ/…#‚/  DlfVji]jYVƒjƒjTiV‚jRdljŽ"// †#ƒ/1œ$:„/#†‚/ jJYldjVVƒjJ‚jJiGjjTJ‚jJ‚/‡‚/2š$Aƒ/ˆ‚/ jG„VjYVƒjJ‚j Jdjl]fNjJf ‚/ˆ#ƒ/30–$09ƒ/ ˆ#‚/ ‘Gj]‚iljdJ‚jGJ‚j JdigYVV`‘‚/‰ƒ/;“$0Aƒ/ #‰‚/‘ `jjGTTDjGJ‚jJTƒj‚iR„jGi"//#‰‚/C<0Ž$0Ah‚/ #‰#//“Y„jGgD‚jJVƒj‚NjjGVTDjR‚/Š! ‚/ <0ˆ$2  Ð1998a).Ð Á   ÐÌThe€cartridge€is€closed€at€one€end€with€a€metal€cap.€€The€media€is€sealed€to€the€cap€using€polyurethaneÐ g·  Ðplastic,€epoxy,€or€other€commercially€available€sealant.€€For€certain€applications,€two€cartridges€may€beÐ :Š  Ðplaced€in€series.€€The€cartridges€are€placed€in€a€frame€constructed€of€wood€or€metal.€€A€neoprene€or€siliconeÐ  ]  Ðgasket€seals€the€frame€to€the€clean€air€plenum€of€the€collector.€€The€cartridges€may€be€mounted€horizontallyÐ à0  Ðor€vertically,€if€retrofitting€a€Ô_ÔbaghouseÔ_Ô.€€(EPA,€1998a)Ð ³ ÐÌReplacement€of€the€cartridges€is€generally€performed€outside€of€the€collector.€€This€reduces€the€risk€ofÐ Y© Ðexposure€to€PM€by€the€maintenance€workers.€€This€feature€is€especially€important€for€HAP€applications.€€TheÐ ,| ÐOccupational€Safety€and€Health€Administration€(OSHA)€requires€special€filter€replacement€procedures,Ð ÿO Ðcommonly€referred€to€as€bag€in/bag€out€procedures,€for€many€HAP€applications.€€(Ô_ÔHeumannÔ_Ô,€1997)Ð Ò" ÐÌOperating€conditions€are€important€determinants€of€the€choice€of€filter€media€and€sealant€used€in€theÐ xÈ Ðcartridges.€€Some€filter€media,€such€as€cellulose€paper€filters,€are€useful€only€at€relatively€low€temperaturesÐ K› Ðof€95€to€150ððC€(200€to€300ððF).€€For€high-temperature€flue€gas€streams,€more€thermally€stable€filter€media,Ð n Ðsuch€as€Ô_ÔnonwovenÔ_Ô€polyester,€polypropylene,€or€Ô_ÔNomexÔ_Ôòòððóó,€must€be€used€(EPA,€1998a).€€A€variety€ofÐ ñA Ðcommercially€available€sealants€such€as€polyurethane€plastic€and€epoxy€will€allow€for€operating€temperaturesÐ Ä Ðup€to150ððC€(300ððF).€€Selected€sealants€such€as€heat€cured€Ô_ÔPlasitcolÔ_Ôòòðð€óówill€withstand€operating€temperaturesÐ —ç Ðup€to€200ððC€(400ððF)€(EPA,€1998a;€IFF,€1999).Ð jº ÐÌPractical€application€of€cartridge€collectors€requires€the€use€of€a€large€media€area€in€order€to€avoid€anÐ `  Ðunacceptable€pressure€drop€across€the€filter€media.€€The€number€of€cartridges€utilized€in€a€particular€collectorÐ ã3! Ðis€determined€by€the€choice€of€air-to-cloth€ratio,€or€the€ratio€of€volumetric€air€flow€to€filter€media€area€(Ô_ÔICACÔ_Ô,Ð ¶ " Ð1999).€€The€selection€of€air-to-cloth€ratio€depends€on€the€particulate€loading,€particulate€characteristics,€andÐ ‰!Ù# Ðthe€cleaning€method€used.€€A€high€particulate€loading€will€require€the€use€of€a€larger€number€of€cartridgesÐ \"¬$ Ðin€order€to€avoid€forming€a€heavy€dust€cake,€which€results€in€an€excessive€pressure€drop€(Ô_ÔICACÔ_Ô,€1999).€€TheÐ /#% Ðpaper€and€Ô_ÔnonwovenÔ_Ô€filter€media€used€in€cartridge€filters€have€a€larger€pressure€drop€across€the€filter€thanÐ $R& Ðthe€woven€fabric€used€in€bags.€€For€this€reason,€cartridge€collectors€are€utilized€at€lower€air€flow€rates€and€Ð Õ$% ' Ðparticulate€loadings€than€traditional€Ô_ÔbaghouseÔ_Ô€designs€(Ô_ÔHeumannÔ_Ô,€1997).€Ð ¨%ø ( ÐÌDeterminants€of€cartridge€collector€performance€include€the€filter€media€chosen,€the€cleaning€frequency€andÐ N'ž"* Ðmethods,€and€the€particulate€characteristics.€€Filter€media€can€be€chosen€which€will€intercept€a€greaterÐ !(q#+ Ðfraction€of€particulate,€and€some€filter€media€are€coated€with€a€membrane€with€very€fine€openings€forÐ ô(D$, Ðenhanced€removal€of€submicron€particulate.€€Such€filter€media€tend€to€be€more€expensive.€€(Ô_ÔICACÔ_Ô,€1999)Ð Ç)%- ÐÌPulse„jet€cleaning€of€cartridge€filters€is€relatively€new,€having€only€been€used€for€the€past€30€years.€€ThisÐ m+½&/ Ðcleaning€mechanism€has€consistently€grown€in€popularity€because€it€can€treat€high€dust€loadings,€operateÐ @,'0 Ðat€constant€pressure€drop,€and€occupy€less€space€than€traditional€bag„type€fabric€filters.€€Pulse„jet€cleanedÐ -c(1 Ðcartridge€filters€can€only€operate€as€external€cake€collection€devices.€€The€cartridges€are€closed€at€theÐ æ-6)2 Ðbottom,€and€open€at€the€top.€€Particulate„laden€gas€flows€into€the€collector,€with€diffusers€often€used€toÐ ° Ðprevent€oversized€particles€from€damaging€the€filter€media.€The€gas€flows€from€the€outside€to€the€inside€ofÐ ƒÓ Ðthe€cartridges,€and€then€out€the€gas€exhaust.€The€particles€are€collected€on€the€outside€of€the€filter€mediaÐ V¦ Ðand€drop€into€a€hopper€below€the€cartridge€after€cleaning.€€(EPA,€1998b)Ð )y ÐÌDuring€pulse„jet€cleaning,€a€short€burst,€0.03€to€0.1€seconds€in€duration,€of€high€pressure,€415€to€830Ð Ï ÐÔ_ÔkiloPascalsÔ_Ô€(Ô_ÔkPaÔ_Ô)€(60€to€120€pounds€per€square€inch€gage€(Ô_ÔpsigÔ_Ô)),€air€is€injected€into€the€cartridges€(EPA,Ð ¢ ò Ð1998b;€Ô_ÔAWMAÔ_Ô,€1992).€€The€pulse€is€blown€through€a€venturi€nozzle€at€the€top€of€the€cartridges€andÐ u Å Ðestablishes€a€shock€wave€that€continues€onto€the€bottom€of€the€cartridges.€€The€wave€flexes€the€filter€media,Ð H ˜ Ðdislodging€the€dust€cake.€€The€cleaning€cycle€is€regulated€by€a€remote€timer€connected€to€a€solenoid€valve.€Ð  k  ÐThe€burst€of€air€is€controlled€by€the€solenoid€valve€and€is€released€into€blow€pipes€that€have€nozzles€locatedÐ î >  Ðabove€the€cartridges€(EPA,€1998b).Ð Á   ÐÌThere€are€several€unique€attributes€of€pulse„jet€cleaning.€€Because€the€cleaning€pulse€is€very€brief,€the€flowÐ g·  Ðof€dusty€gas€does€not€have€to€be€stopped€during€cleaning.€€The€other€cartridges€continue€to€filter,€taking€onÐ :Š  Ðextra€duty€because€of€the€cartridges€being€cleaned.€€In€general,€there€is€no€change€in€filter€pressure€drop€orÐ  ]  Ðperformance€as€a€result€of€pulse„jet€cleaning.€€This€enables€the€cartridge€collectors€with€pulse„jet€cleaningÐ à0  Ðto€operate€on€a€continuous€basis€with€solenoid€valves€as€the€only€significant€moving€parts.€€Pulse„jet€cleaningÐ ³ Ðis€also€more€intense€and€occurs€with€greater€frequency€than€the€other€filter€cleaning€methods.€€This€intenseÐ †Ö Ðcleaning€dislodges€nearly€all€of€the€dust€cake€each€time€the€cartridge€is€pulsed.€€As€a€result,€pulse„jet€filtersÐ Y© Ðdo€not€rely€on€a€dust€cake€to€provide€filtration.€€Paper€and€Ô_ÔnonwovenÔ_Ô€filter€media€are€used€in€pulse„jetÐ ,| Ðcleaned€cartridge€collectors€because€they€do€not€require€a€dust€cake€to€achieve€high€collection€efficiencies.€Ð ÿO Ð(EPA,€1998b)Ð Ò" ÐÌSince€cartridges€cleaned€by€the€pulse„jet€method€do€not€need€to€be€isolated€for€cleaning,€the€collector€doesÐ xÈ Ðnot€need€extra€compartments€to€maintain€adequate€filtration€during€cleaning.€€In€addition,€the€pleating€of€theÐ K› Ðfilter€media€provides€increased€filter€area€per€housing€volume.€Consequently,€cartridge€collectors€cleanedÐ n Ðby€the€pulse„jet€method€can€be€smaller€than€traditional€fabric€filter€Ô_ÔbaghousesÔ_Ô€in€the€treatment€of€the€sameÐ ñA Ðamount€of€gas€and€dust€(EPA,€1998b).€€A€cartridge€collector€is€approximately€4€times€smaller€than€Ô_ÔbaghouseÔ_ÔÐ Ä Ðdesigns€for€similar€gas€streams€(Ô_ÔHeumannÔ_Ô,€1997).€Ð —ç ÐÌò òAdvantages:ó óÐ = ÐÌCartridge€filters€in€general€provide€high€collection€efficiencies€on€both€coarse€and€fine€(submicron)Ð ë;! ÐÔ_ÔparticulatesÔ_Ô.€€They€are€relatively€insensitive€to€fluctuations€in€gas€stream€conditions.€€Efficiency€and€pressureÐ ¾ " Ðdrop€are€relatively€unaffected€by€large€changes€in€inlet€dust€loadings€for€continuously€cleaned€filters.€€FilterÐ ‘!á# Ðoutlet€air€is€very€clean€and€may€be€Ô_ÔrecirculatedÔ_Ô€within€the€plant€in€many€cases€(for€energy€conservation).€Ð d"´$ ÐPM€is€collected€dry€for€subsequent€processing€or€disposal.€€Corrosion€and€rusting€of€components€are€usuallyÐ 7#‡% Ðnot€problems.€€Operation€is€relatively€simple.€€Unlike€electrostatic€Ô_ÔprecipitatorsÔ_Ô,€cartridge€filter€systems€doÐ  $Z& Ðnot€require€the€use€of€high€voltage,€therefore,€maintenance€is€simplified€and€flammable€dust€may€beÐ Ý$- ' Ðcollected€with€proper€care.€€The€use€of€selected€fibrous€or€granular€filter€aids€(Ô_ÔprecoatingÔ_Ô)€permits€the€high„Ð °%!( Ðefficiency€collection€of€submicron€smokes€and€gaseous€contaminants.€€Cartridge€collectors€are€available€inÐ ƒ&Ó!) Ða€large€number€of€configurations,€resulting€in€a€range€of€dimensions€and€inlet€and€outlet€flange€locations€toÐ V'¦"* Ðsuit€installation€requirements.€€(Ô_ÔAWMAÔ_Ô,€1992)Ð )(y#+ ÐÓM:ÓÌÔ  Ôò òDisadvantages:ó óÐ Ï)%- ÐÓ  ÓÌTemperatures€much€in€excess€of€95ððC€(200ððF)€require€special€filter€media,€which€can€be€expensive€(EPA,Ð }+Í&/ Ð1998a).€€Certain€dusts€may€require€filter€media€treatments€to€reduce€dust€seepage,€or€in€other€cases,€assistÐ P, '0 Ðin€the€removal€of€the€collected€dust.€€Concentrations€of€some€dusts€in€the€collector,€approximately€50€g/Ô_Ômòò3Ô_ÔóóÐ #-s(1 Ð(22€gr/ftòò3óó),€may€represent€a€fire€or€explosion€hazard€if€a€spark€or€flame€is€accidentally€admitted.€€CartridgeÐ ö-F)2 Ðfilters€can€burn€if€readily€oxidizable€dust€is€being€collected.€€Cartridge€filters€have€relatively€high€maintenanceÐ ° Ðrequirements€(e.g.,€periodic€cartridge€replacement).€€Filter€life€may€be€shortened€at€elevated€temperaturesÐ ƒÓ Ðand€in€the€presence€of€acid€or€alkaline€particulate€or€gas€constituents.€€They€cannot€be€operated€in€moistÐ V¦ Ðenvironments;€hygroscopic€materials,€condensation€of€moisture,€or€tarry€adhesive€components€may€causeÐ )y Ðcrusty€caking€or€plugging€of€the€filter€media€or€require€special€additives.€€Medium€pressure€drop€is€required,Ð üL Ðtypically€in€the€range€of€100€to€250€mm€of€water€column€(4€to€10€in.€of€water€column)€(Ô_ÔAWMAÔ_Ô,€1992).Ð Ï ÐÌA€specific€disadvantage€of€pulse„jet€units€that€use€very€high€gas€velocities€is€that€the€dust€from€the€cleanedÐ u Å Ðcartridges€can€be€drawn€immediately€to€the€other€cartridges.€€If€this€occurs,€little€of€the€dust€falls€into€theÐ H ˜ Ðhopper€and€the€dust€layer€on€the€cartridges€becomes€too€thick.€€To€prevent€this,€cartridge€collectors€withÐ  k  Ðpulse„jet€cleaning€can€be€designed€with€separate€compartments€that€can€be€isolated€for€cleaning.€€(EPA,Ð î >  Ð1998b)Ð Á   ÐÌò òÔ&  ÔOther€Considerations:ó óÐ g·  ÐÌCartridge€collectors€are€useful€Ô'g8oÔfor€collecting€particles€with€Ô_ÔresistivitiesÔ_Ô€either€too€low€or€too€high€for€collectionÐ e  Ðwith€electrostatic€Ô_ÔprecipitatorsÔ_Ô€(Ô_ÔSTAPPAÔ_Ô/Ô_ÔALAPCOÔ_Ô,€1996).€€They€are€ideal€for€HAP€applications€due€to€theÐ è8  Ðcartridge€replacement€procedure€being€performed€outside€the€collector€housing.€€€For€similar€air€flow€rates,Ð »  Ðcartridge€collectors€are€compact€in€size€compared€to€traditional€Ô_ÔbaghousesÔ_Ô.€€The€application€of€cartridgeÐ ŽÞ Ðcollectors€is€limited€to€low€air€flow€rates€(Ô_ÔHeumannÔ_Ô,€1997).€Ð a± ÐÓ¼gÓÌò òReferences:ó óÐ W ÐÌAAF,€1999.€€€AAF€International,€Inc.,€internet€web€page€www.aafintl.com/equipment/,€Core€ProductsÐ µ ÐInformation,€last€updated€December.Ð ˆØ ÐÌÔ_ÔAWMAÔ_Ô,€1992.€€Air€&€Waste€Management€Association,€€òòAir€Pollution€Engineering€Manualóó,€Van€Ô_ÔNostrandÔ_ÔÐ .~ ÐReinhold,€New€York.€Ð Q ÐÌEPA,€1997.€€U.S.€EPA,€Office€of€Air€Quality€Planning€and€Standards,€ð ðCompilation€of€Air€PollutantÐ §÷ ÐEmission€Factors,€Volume€I,€Fifth€Edition,€Research€Triangle€Park,€NC.,€October.Ð zÊ ÐÌEPA,€1998a.€€U.S.€EPA,€Office€of€Air€Quality€Planning€and€Standards,€ð ðÔ_ÔOAQPSÔ_Ô€Control€Cost€Manual,ððÐ  p  ÐFifth€Edition,€Chapter€5,€€EPA€453/B„96„001,€Research€Triangle€Park,€NC.€December.€Ð óC! ÐÌEPA,€1998b.€€U.S.€EPA,€Office€of€Air€Quality€Planning€and€Standards,€ð ðStationary€Source€ControlÐ ™!é# ÐTechniques€Document€for€Fine€Particulate€Matter,ðð€EPA„452/R„97„001,€Research€Triangle€Park,€NC.,Ð l"¼$ ÐOctober.Ð ?#% ÐÌÔ_ÔHeumannÔ_Ô,€1997.€€W.€L.€Ô_ÔHeumannÔ_Ô,€Industrial€Air€Pollution€Control€Systems,€Ô_ÔMcGrawÔ_Ô€Hill€Publishers,€Inc.,€Ð å$5 ' ÐWashington,€D.C.Ð ¸%!( ÐÌÔ_ÔICACÔ_Ô,€1999.€€Institute€of€Clean€Air€Companies€Ô_ÔinternetÔ_Ô€web€page€www.icac.com,€Control€TechnologyÐ ^'®"* ÐInformation€„€Fabric€Filters,€page€last€updated€January€11,€1999.Ð 1(#+ ÐÌIFF,€1999.€€Industrial€Filter€Fabric,€Inc.€€Ô_ÔinternetÔ_Ô€web€page€www.iff„filters.com,€Product€Bulletin€003;Ð ×)'%- ÐCartridge€Filters,€December,€1999.Ð ª*ú%. ÐÌÔ_ÔSTAPPAÔ_Ô/Ô_ÔALAPCOÔ_Ô,€1996.€€State€and€Territorial€Air€Pollution€Program€Administrators€and€Association€ofÐ P, '0 ÐLocal€Air€Pollution€Control€Officials,€ð ðControlling€Particulate€Matter€Under€the€Clean€Air€Act:€A€Menu€ofÐ #-s(1 ÐOptions,ðð€July.€Ð ö-F)2 ЇÔ_ÔToritÔ_Ô,€1999.€€Ô_ÔToritÔ_Ô€Products€a€Subsidiary€of€Donaldson€Company,€Inc.€€Ô_ÔinternetÔ_Ô€web€pageÐ ° Ðwww.torit.com/lproducts,€Industrial€Dust€Collection€Systems,€last€updated€December.