Blower Silencers - Technical Literature - Universal: Acoustic Silencers

Blower SilencersTechnical LiteratureInlet SilencersUCI/UCIY/UCIA Series Page 4RIS/RISY/RISH Series Page 5Discharge SilencersUCD/UCDY Series Page 6URB/URD/URBY/URDY Series Page 7SD/SDY/SDH/SDS Series Page 8RD/RDY/RDH/RDS Series Page 9SURS/SURSY Series Page 10CBF/CBFI Series Page 11CB Series Page 12UNI-BASE Series Page 13–14AccessoriesAttachment Brackets and Legs Page 15–19Companion Flanges Page 20–21Inspection Openings and Relief Covers Page 22Universal AET retains the right to update this technical sheet without notice.Please contact your Universal representative to verify the timelines of this technical literature sheet.© 2011 Universal Acoustic & Emission Technologies, Inc. All rights reserved.Toll-Free: 1-888-300-4272www.universalAET.com94-1547 Rev 0

Notes:

In a closed blower discharge system,structure-borne noise—such as that radiatedby pipe wall and silencer shell—may be aconsideration, particularly where a stringent,close-proximity noise specification applies.For these applications, various means are availableto treat the pipe and shell radiated noise, such thatmost reasonable specifications may be met.For instance, it is possible to lag the silencer shellexternally and reduce any shell noise contributionto below the casing and mechanical noise of theblower and driving machinery.Universal invites your inquiries concerningspecial applications where EPA, OSHA or othernoise specifications apply. Special applicationsare handled on an individual basis andrecommendations are made according tospecific requirements of the installation.GeneralInformationBlower SilencersRotary Positive BlowersThe Rotary Positive Blower is a two impellercompressor that delivers a large quantity of gasor air relative to the individual pulses. Blowercapacities are expressed in CFM at inlet conditions(ICFM). Blower size is usually expressed as geardiameter by rotor length. Pitch Line Velocity (PLV)is the peripheral velocity of the timing gear—equalto the product of the gear circumference and therotative speed of the blower, usually expressed infeet per minute (FPM).The blower presents two problems:1) pulsation within the piping system and,2) noise radiation in the vicinity of the blowerand piping.The importance of these relative to each other is afunction of blower size and speed; both increaseproportionately to the blower size and the squareof the speed.Pulsation is more pronounced on the dischargeside. Peak pulse pressures are quite severe andcan result in unsilenced discharge sound powerlevels up to 140–145 dB. The inlet, althoughproducing less severe pulsation and noise, receivesequal attention since the inlet is usually open toatmosphere and the noise much more apparent.SilencersThere is little question that silencers are a necessityon any blower installation. Regardless of the sizeor speed of the blower, silencers of some type arenearly always used.In the selection of blower silencers, there are twobasic considerations: 1) the silencer must be thecorrect size (i.e., sufficient capacity for the volumeflow) and, 2) the silencer must be the propertype for the application. The nominal silencersize need only be based on the gas volume,(i.e., the CFM of the gas or air at the operatingconditions). However, the silencer (design) must beselected with consideration of the blower size andoperating speed. Complete application and capacityinformation is given on page 3.There are two types of silencers commonly usedon positive blowers: a reactive type silencer whichconsists of a series of expansion chambers havinginterconnecting tubes, a more sophisticatedsilencer design. is the combinationchamber-absorptive type. This combination silenceris similar to the reactive type with the exceptionthat an acoustically-packed, sound absorbingsection is included, comprising an extension of thesilencer connection closest to the blower. The inletof a discharge silencer and the outlet of an inletsilencer are the ends having the packed section.A third basic type of silencer—the simple,straight-through packed type—is occasionally usedon blowers. This type of silencer is usually used onsmall, high speed machines which characteristicallyproduce significant high frequency noise andrelatively mild pulsations.The PLV is normally the criterion for silencer typeselection. If the blower is operating in the criticalPLV range, it will generate objectionable highfrequency noise which may cause shell ring or tankhammer in the piping and silencer. These criticalPLV conditions will always require a combinationchamber-absorptive silencer for satisfactory results.Inlet SilencersFor inlet service, a PLV of 3,300 ft/min or greateris considered critical. This transition speed isempirically established and is somewhat arbitrary,however, it is commonly accepted that blowersoperating at or above 3,300 ft/min are consideredcritical for the purpose of inlet silencer application.Those operating below 3,300 ft/min are consideredsubcritical. Subcritical PLV applications canusually be silenced adequately with a chambertypesilencer, such as Universal URB or UCISeries. Blowers operating above the critical PLV of3,300 ft/min will invariably require the RIS Seriescombination chamber-absorptive type silencer. InletFilters or Filter Silencers are commonly used onblower inlets, either individually or in series with aseparate inlet silencer. Please reference Filters andFilter Silencers Technical Literature booklet#94-1553.Discharge SilencersFor the more severe discharge conditions of typicalblower installations, a PLV of 2,700 ft/min isaccepted as the critical transition speed. Blowersoperating below 2,700 ft/min are consideredsubcritical and can usually be adequately silencedon the discharge side by use of a chamber-typesilencer UCD or URD Series. Machines operatingabove the 2,700 ft/min transition speed will requirecombination chamber-absorptive silencers such asSD or RD Series.In some larger blower installations, pipingrequirements or space restrictions may precludethe use of a large, single discharge silencer such asthe SD or RD Series.Where two or more blowers discharge into acommon header, individual silencers upstream ofthe header are required to subdue the individualblower pulsations. Otherwise, the pulsations tendto beat with each other and can be extremelyobjectionable.Note: Silencers should be mounted as close to theblower as possible since any piping between theblower and silencer will radiate noise. Standardsilencer connections are not designed to carryexternal piping or valve loads, so good pipingsupport practices should be used to preventstresses that cause fatigue and eventual fractureof the silencer or piping. It is also good practice toisolate the blower from the silencer with a flexibleexpansion joint. Contact Universal for specialdesign considerations where loading is a factor.Attenuation CurvesNoise attenuation curves are given for the variousmodels within this catalog.The curves represent insertion loss of airbornenoise for typical applications under averageconditions. It is not feasible to chart the expectedperformance of a silencer over a wide range ofapplications and conditions, therefore, the curvesmust be used with discretion. Structure-bornenoise (see above) may be a consideration and willrequire separate analysis, since it is not airbornenoise and not used for silencer performance rating.Use our online Blower Silencer calculator atwww.universalAET.com.© 2011 Universal Acoustic & Emission Technologies, Inc. All rights reserved.Toll-Free: 1-888-300-4272www.universalAET.com94-1547 Rev 01

GeneralInformationRotary Positive BlowersThe silencers shown below are more fullydescribed on the individual catalog pages. Theseunits are designed specifically for use on RotaryPositive Blowers.There are fundamental similarities between blowersilencers and other types, particularly reciprocatingengine silencers, which also require a silencerdesign that provides effective pulse control as wellas noise attenuation. However, blower silencersgenerally must be constructed more ruggedly towithstand prolonged exposure to severe pulsationsproduced by the blower.All silencers described are of standard with end in,end-out design. Low or high side inlet and outletconnections are available and are described on theindividual catalog pages.Accessories,Special FeaturesMounting BracketsInspection OpeningsPressure Vessel ConstructionOversize FlangesSpecial FinishesSpecial MaterialsUCI SeriesInlet SilencerChamber-type inlet silencer for use on sub-criticalPLV applications. Available in pipe sizes 8"–30".Smaller sizes use URB Series. Available with sideconnections and mounting brackets.RIS SeriesInlet SilencerCombustion chamber-absorptive type inlet silencerfor critical PLV applications. Available in pipe sizes2"–30". Low or high side outlet and mountingbrackets available on most sizes.UCD SeriesURB/URD SeriesDischarge SilencersChamber-type discharge silencer for use onsub-critical PLV applications. Available in pipesizes 8"–30". (Smaller sizes use URB Series). Low,high, or opposed side connections and mountingbrackets available.SD SeriesRD SeriesDischarge SilencersCombination chamber-absorptive type dischargesilencers for critical PLV applications. Availablein pipe sizes 2"–30". Low, high, or opposed sideconnections and mounting brackets available onmost sizes.© 2011 Universal Acoustic & Emission Technologies, Inc. All rights reserved.Toll-Free: 1-888-300-4272www.universalAET.com94-1547 Rev 02

Silencer RecommendationsAs mentioned on page 2 pitch line velocity (PLV) isthe speed of the timing gear in feet per minute (ft/min). For purposes of silencer application. PLV isconsidered “critical” at 3,300 ft/min for intake and2,700 ft/min for discharge.Table 1 gives transition speeds in RPM. Blowersrunning at these speeds or greater will have criticalPLV. Operating speeds below transition will be inthe sub-critical range. Blowers operating in thesub-critical speed range usually require only simplechamber-type silencers while those in the criticalrange require combination chamber-absorptivetype silencers. If there is doubt, it is best to usethe combination-type silencers. When gear sizeand operating speeds are known, the proper typesilencer is easily selected.Silencer Size Selection, CapacityTable 3 gives the nominal capacity of the varioussize silencers. “Size” in this table refers to thesilencer “nominal size,” or its “inlet size.” Capacitiesare expressed in inlet CFM (ICFM), thus, dischargesilencers are rated at higher capacities than inletsilencers since the air is compressed to reducedvolume at the discharge operating pressure.3Size11.522.533.545681012141618202224262830Est Temp.Silencer CapacityInlet Silencer30701201902703704807501,0801,9203,0004,3005,9007,7009,70012,00014,50017,30020,30023,50027,00070˚FA From Table 1 determine whether blower RPM isabove or below the transition speed forcritical PLV.B Consult Table 2 for recommendedsilencer models.Pressure DropThe following formulas may be used to calculatepressure drop through the silencers covered in thiscatalog.VP = Inlet:4005(assumes silencer inletis open to atmosphere)Application,Capacity,Pressure Drop DataBlower Silencers1 Blower Transition SpeedBlower Transition Speed-RPMGear Size Inlet DischargeDischarge:2P V c P 5302 6,300 5,1552.54005 14.75,040 4,125T3 4,200 3,435P = pressure drop through silencer, inchesof waterV = air velocity through silencer, ft/min*c = individual silencer restrictioncoefficient—empirical constant (seeTable 4)P = discharge pressure, PSIA (operatingpressure in PSIG + 14.7)T = discharge temperature, ˚R absolute(operating temperature in ˚F + 460)* To calculate velocity through silencer, divide flow in ACFM bycross-sectional area of silencer inlet diameter in square feet.45678101214161820223,1502,5202,1001,8001,5751,2601,0509007857006305702,5752,0601,7201,4701,2901,03086073564557051547024525 430Capacity (Inlet CFM 14.7 PSIA at 70˚F)Discharge Silencer4 PSIG 6 PSIG 8 PSIG 10 PSIG 15 PSIG 2 Silencer Model Specifications35 40 40 40 45Pitch Line Inlet DischargeVelocity Silencer Silencer80 85 90 95 1052c140 150 160 165 185BelowTransition220 235 245 255 285UCI, URB URB, UCD, URD320 335 355 370 415AboveTransition430 455 480 505 560RIS SD, RD560 600 630 660 735880 935 985 1,030 1,1501,260 1,340 1,410 1,480 1,6504 Pressure Drop Coefficients2,250 2,390 2,510 2,630 2,940ModelPressure DropCoefficient (C)3,520 3,730 3,930 4,110 4,590URB, URBY4.25,070 5,370 5,660 5,920 6,600UCI, UCIY, UCIH4.26,890 7,310 7,700 8,060 8,990RIS, RISY, RISH4.29,000 9,550 10,000 10,500 11,800UCD, UCDY4.211,400 12,100 12,700 13,300 14,900URD, URDY, URDH 4.214,000 14,900 15,700 16,400 18,400SD, SDY, SDH4.217,000 18,100 19,000 19,900 22,200RD, RDY, RDH4.220,200 21,500 22,600 23,700 26,400RDS, SDS, URDS7.023,800 25,200 26,600 27,800 31,00027,600 29,300 30,800 32,200 36,00031,700 33,600 35,400 37,000 41,300115˚F 140˚F 165˚F 190˚F 240˚F© 2011 Universal Acoustic & Emission Technologies, Inc. All rights reserved.Toll-Free: 1-888-300-4272www.universalAET.com94-1547 Rev 03

SpecificationsUCI GroupChamber TypeInlet SilencerAttenuation, dB5040302010Typical Attenuation Curve063 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, HzPressure Vessel ConstructionSilencers may be fabricated in accordance withDiv. 1, Section VIII—ASME Code for UnfiredPressure Vessels. Dimensions are similarto standard models, but material typesand thicknesses are selected to meet coderequirements. Prices are quoted on application tomeet your pressure and temperature conditions.The UCI Series Inlet Silencer is a heavy-duty, allwelded unit constructed of carbon steel sheet andplate. It provides pulse control and silencing formost subcritical PLV applications. Sizes 8" andlarger are equipped with flanged connections drilledto 125/150 lb ANSI specifications. Exterior surfacesreceive a shop coat of rust-inhibitive primer andmay be finish painted in the field if desired. TheUCI Series is the basic inlet model and is theconventional end-in,end-out version. The low sideinlet model is designated UCIY Series and the highside inlet type is designated UCIH Series. The threetypes are fundamentally alike and performance isidentical. Mounting brackets and other options areavailable—see page 11.UCI SeriesNL H DUCIY Series(Low Side Outlet)YUCIH Series(High Side Outlet)YNPDrainKKChamber Type Inlet SilencersP(Size)11.522.533.545681012141618202224262830PartNumber53-108-AA53-110-AA53-112-AA53-114-AA53-116-AA53-118-AA53-120-AA53-122-AA53-124-AA53-126-AA53-128-AA53-130-AAD L N H K222630303642424854546066617487991131261401531671791932063.53.53.53.53.53.54.54.54.54.54.54.5Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.54678092106119131144158170184197MinSizes 1"–6" Use URB Series (page 7)14.516.518.518.521.524.525.528.531.531.534.537.591112.513.515.517.51920.522.523.525.527.5UCIYMax212734404855.560.566.572858795YMin28.534.54147.553.559.56775838491100UCIHMax45.5576980.591.5103.5114126138149161173Weight2403455756359251,2001,3501,9502,5002,7503,4454,650© 2011 Universal Acoustic & Emission Technologies, Inc. All rights reserved.Toll-Free: 1-888-300-4272www.universalAET.com94-1547 Rev 04

Pressure Vessel ConstructionSilencers may be fabricated in accordance withDiv. 1, Section VIII—ASME Code for UnfiredPressure Vessels. Dimensions are similarto standard models, but material typesand thicknesses are selected to meet coderequirements. Prices are quoted on application tomeet your pressure and temperature conditions.Attenuation, dB50403020100Typical Attenuation Curve63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, HzSpecificationsRIS GroupCombination Chamber-Absorptive TypeInlet SilencerThe RIS Series Inlet Silencer is a heavy-duty, allwelded unit constructed of carbon steel sheet andplate. It features an acoustically-treated outlet andwill provide pulse control and silencing suitablefor critical PLV applications. Sizes 4" and largerare equipped with flanged connections drilled to125/150 lb ANSI specifications. Smaller sizes arestandard with male threaded pipe nipples. Unitssized 4" and 5" are available in either flanged ormale pipe threads. Exterior surfaces receive a shopcoat of rust inhibitive primer and may be finishpainted in the field if desired.RIS SeriesNRISY Series(Low Side Outlet)RISH Series(High Side Outlet)EThe RIS Series is the basic model, havingconventional end-in, end-out configuration. A lowside outlet version is designated RISY Series andhigh side outlet configuration is designated RISHSeries. The three types are fundamentally alike andperformance is identical. Mounting brackets andother options are available—see page 11.L HNDPKYKYCombination Chamber-Absorptive Type Inlet SilencersP(Size)11.522.533.545681012141618202224262830PartNumber54-102-AA54-125-AA54-103-AA54-135-AA54-104-AA *54-105-AA *54-106-AA54-108-AA54-110-AA54-112-AA54-114-AA54-116-AA54-118-AA54-120-AA54-122-AA54-124-AA54-126-AA54-128-AA54-130-AAD L N H8881010121418222630364242485454606628.5333939.54557.56472859811111312614015316717919320633333333.53.53.53.53.53.54.54.54.54.54.54.522.5273333.53951.558657891104106119131144158170184197Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.*Specify -TT for male pipe threaded units.RISY8.59101112.515.51721.525.529.53035.5414746.55455.56166.5KRISH————14.517.52026.532.5384049.557.562.565.575.57684.593.5E————2.252.753.254567.5000000007.5991213.51516.518.520.52223.525.525.529.530.5RISYMin MaxSizes 1"–1.5" use U5 Series (Absorptive Silencers Technical Literature booklet #94-1549 page 2)FIXED AT 6FIXED AT 7FIXED AT 7FIXED AT 816.52325.530.53744505158.563.569.575879198YRISHMin Max2.5" THRU 3.5"AVAILABLE ONSPECIAL ORDER30.5 32.540 43.543.5 4949.5 5461.5 65.569 7781 89.556.5 88.562.5 100.570 11178 12386 13586 14795 157103 170Weight2525304050801101903805508001,0501,3501,5002,1002,7003,0503,8505,150© 2011 Universal Acoustic & Emission Technologies, Inc. All rights reserved.Toll-Free: 1-888-300-4272www.universalAET.com94-1547 Rev 05

SpecificationsUCD GroupChamber TypeDischarge SilencerAttenuation, dB50403020100Typical Attenuation Curve63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, HzPressure Vessel ConstructionSilencers may be fabricated in accordance withDiv. 1, Section VIII—ASME Code for UnfiredPressure Vessels. Dimensions are similarto standard models, but material typesand thicknesses are selected to meet coderequirements. Prices are quoted on application tomeet your pressure and temperature conditions.The UCD Series Discharge Silencer is a heavy-duty,all welded unit constructed of carbon steel sheetand plate. It provides pulse control and silencingfor subcritical PLV applications where the higherperformance of the URD Series on page 7 is notwarranted. Sizes 8" and larger are equipped withflanged connections drilled to 125/150 lb ANSIspecifications. Exterior surfaces receive a shopcoat of rust-inhibitive primer and may be finishpainted in the field if desired. The UCD Series isthe basic end-in, end-out configuration. A low sideinlet version is designated UCDY Series. The twotypes are fundamentally alike and performancecharacteristics are identical. Mounting brackets andother options are available—see page 11.UCD SeriesNL H DUCDY Series(Low Side Inlet)YNPDrainKChamber Type Discharge SilencersP(Size)PartNumberD L N H KMinYMaxWeight11.522.533.54568101214161820222426283056-108-AA56-110-AA56-112-AA56-114-AA56-116-AA56-118-AA56-120-AA56-122-AA56-124-AA56-126-AA56-128-AA56-130-AA222630303642424854546066617487991131261401531671791932063.53.53.53.53.53.54.54.54.54.54.54.5Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.Sizes 1"–6" use URB Series (page 7)5467809210611913114415817018419714.516.518.518.521.524.525.528.531.531.534.537.591112.513.515.517.51920.522.523.525.527.5212734404855.560.566.5728587952403405205959501,2001,3501,9502,4502,7503,4454,650© 2011 Universal Acoustic & Emission Technologies, Inc. All rights reserved.Toll-Free: 1-888-300-4272www.universalAET.com94-1547 Rev 06

Pressure Vessel ConstructionSilencers may be fabricated in accordance withDiv. 1, Section VIII—ASME Code for UnfiredPressure Vessels. Dimensions are similarto standard models, but material typesand thicknesses are selected to meet coderequirements. Prices are quoted on application tomeet your pressure and temperature conditions.Note: Sizes 1"–6" are URB Series;sizes 8"–30" are URD Series. Both series arefundamentally the same in design and theperformance characteristics are identical.Attenuation, dB50403020100Typical Attenuation Curve63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, HzSpecificationsURB GroupURD GroupChamber TypeDischarge SilencerThe URB/URD Series Discharge Silencer is aheavy-duty, all welded unit constructed of carbonsteel sheet and plate. It provides pulse control andsilencing for subcritical PLV applications. Sizes 4"and larger are equipped with flanged connectionsdrilled to 125/150 lb ANSI specifications. Smallersizes are standard with male threaded pipe nipples.Units sized 4" and 5" are available in either flangedor male pipe threads. Exterior surfaces receive ashop coat of rust-inhibitive primer and may befinish painted in the field if desired. The URB/URDSeries is the basic end-in, end-out configuration.A low side inlet version is designated URBY/URDYSeries; high side inlet is designated URDH Series;and low opposed connection is designated URDSSeries. The four types are fundamentally alike andperformance characteristics are identical. Mountingbrackets and other options are available—seepage 11.URB,URD SeriesNURBY,URDY Series(Low Side Inlet)URDH Series(High Side Inlet)URDS Series(Opposed Connections)L HDYYYChamber Type Discharge SilencersP(Size)11.522.533.545681012141618202224262830PartNumber55-101-AA55-115-AA55-102-AA55-125-AA55-103-AA55-135-AA55-104-AA *55-105-AA *55-106-AA55-108-AA55-110-AA55-112-AA55-114-AA55-116-AA55-118-AA55-120-AA55-122-AA55-124-AA55-126-AA55-128-AA55-130-AAD L N H4.56.58101012141618222630364248485454606672212433344652536572971221351611811882022042392592793042233333333.53.53.53.53.53.54.54.54.54.54.54.517202728404647596690115128154174181193195230250270295Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.*Specify -TT for male pipe threaded units.NPK——788910111214.516.518.521.524.527.528.531.531.534.537.540.5KYURBY, URDY URDH URDSMin Max Min Max Min Max————————————FIXED AT 6FIXED AT 7FIXED AT 7FIXED AT 8————————————————66.5891112.514.516.518.519.521.522.52527292229324863.5698192.598103103126132144161—28316276.588107119.5126.5134137156.5175188203—525982106117.5141158.5164.5175.5175.5210.52282462728910121415.517.519.521.522.524.525.52731321619222940.5424955.556.5616076.5788596KKKWeight101525304065751151503555457751,2401,6002,3002,5002,9503,4504,4006,1507,250© 2011 Universal Acoustic & Emission Technologies, Inc. All rights reserved.Toll-Free: 1-888-300-4272www.universalAET.com94-1547 Rev 07

SpecificationsSD GroupCombination Chamber-Absorptive TypeDischarge SilencerAttenuation, dB50403020100Typical Attenuation Curve63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, HzPressure Vessel ConstructionSilencers may be fabricated in accordance withDiv. 1, Section VIII—ASME Code for UnfiredPressure Vessels. Dimensions are similarto standard models, but material typesand thicknesses are selected to meet coderequirements. Prices are quoted on application tomeet your pressure and temperature conditions.Acoustical packing is suitable for 325˚FThe SD Series Discharge Silencer is a heavy-duty,all welded unit constructed of carbon steel sheetand plate. It will provide excellent pulse controland is equipped with an acoustically-treated inletfor use on critical PLV applications. Its pulse andnoise performance is recommended for all but themost demanding applications, which may requirethe RD Series on page 9. Sizes 4" and larger areequipped with flanged connections drilled to125/150 lb ANSI specifications. Smaller sizes arestandard with male threaded pipe nipples. Unitssized 4" and 5" are available in either flanged ormale pipe threads. Exterior surfaces receive a shopcoat of rust-inhibitive primer and may be finishpainted in the field if desired. The SD Series is thebasic end-in, end-out configuration. A low sideinlet is designated the SDY Series; high side inlet,SDH Series; and low opposed connection, SDSSeries. The four types are fundamentally alike andperformance characteristics are identical. Mountingbrackets and other options are available—seepage 11.NL HSD SeriesDSDY Series(Low Side Inlet)YSDH Series(High Side Inlet)EYSDS Series(Opposed Connection)YNPDrainKKBKCombination Chamber-Absorptive Type Discharge SilencersP(Size)11.522.533.545681012141618202224262830PartNumber54-102-AA54-125-AA54-103-AA54-135-AA54-104-AA*54-105-AA*54-106-AA54-108-AA54-110-AA54-112-AA54-114-AA58-116-AA58-118-AA58-120-AA58-122-AA58-124-AA58-126-AA58-128-AA58-130-AAD88810101214182226303642424848545460Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.*Specify -TT for male pipe threaded units.L28.5333939.54557.564728598111137150176195213233250276N33333333.53.53.53.53.53.54.54.54.54.54.54.5H22.5273333.53951.5586578911041301431671862042242412678.59101112.515.51721.525.529.53035.541474755.5556268KSDY SDH SDSSizes 1" and 1.5" use URB Series (page 7)————14.517.52026.532.538404752626172768190————14.517.52026.532.538404752626172768190B————891012.514.516.518.521.524.525.528.528.531.531.534.5E————2.252.753.254567.59.511.510.512.511.513.512.514.5Min MaxSDYMin Max————7.5991213.51516.518.520.521.523.524.52628.529.5————16.52325.530.53744506570.587.593.5110.5117126.5139Min Y MaxSDSMin Max————7.59101213.51516.518.520.521.523.524.52628.529.5————9.512.515.516.51824253640.548.550.560.57071.581Min MaxSDHMin Max————30.54043.549.561.5698196104.5120.5138.5146.5157.5173.5190————32.543.5495465.57789.5113.5124.5147.5165.5182.5201.5216.5241.5Weight2025304050801151854055358201,2651,6401,9002,7103,0303,9154,4005,425© 2011 Universal Acoustic & Emission Technologies, Inc. All rights reserved.Toll-Free: 1-888-300-4272www.universalAET.com94-1547 Rev 08

Pressure Vessel ConstructionSilencers may be fabricated in accordance withDiv. 1, Section VIII—ASME Code for UnfiredPressure Vessels. Dimensions are similarto standard models, but material typesand thicknesses are selected to meet coderequirements. Prices are quoted on application tomeet your pressure and temperature conditions.Acoustical packing is suitable for 325˚FAttenuation, dB50403020100Typical Attenuation Curve63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, HzSpecificationsRD GroupCombination Chamber-Absorptive TypeDischarge SilencerThe RD Series Discharge Silencer is a heavy-duty,all welded unit constructed of carbon steel sheetand plate. It provides excellent pulse control andis equipped with an acoustically treated inlet foruse on critical PLV applications. Pulse controland noise attenuation provided by the RD Seriesis the ultimate and is necessary for only the mostdemanding installations. Sizes 4" and larger areequipped with flanged connections drilled to125/150 lb ANSI specifications. Smaller sizes arestandard with male threaded pipe nipples. Unitssized 4" and 5" are available in either flanged ormale pipe threads. Exterior surfaces receive a shopcoat of rust inhibitive primer and may be finishpainted in the field if desired. The RD Series is thebasic end-in, end-out configuration. A low sideinlet is designated the RDY Series; high side inlet,RDH Series; and low opposed connections, RDSSeries. The four types are fundamentally alike andperformance is identical. Mounting brackets andother options are available—see page 11.NL HRD SeriesNDPDrainRDY Series(Low Side Inlet)KYRDH Series(High Side Inlet)EKYRDS Series(Opposed Connection)BKYCombination Chamber-Absorptive Type Discharge SilencersP(Size)11.522.533.545681012141618202224262830PartNumber57-102-AA57-125-AA57-103-AA57-135-AA57-104-AA*57-105-AA*57-106-AA57-108-AA57-110-AA57-112-AA57-114-AA57-116-AA57-118-AA57-120-AA57-122-AA57-124-AA57-126-AA57-128-AA57-130-AAD8101012141618222630364248485454606672Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.*Specify -TT for male pipe threaded units.L3334435253657297122135161181188202204239259279304N33333333.53.53.53.53.53.54.54.54.54.54.54.5H2728404647596690115128154174181193195230250270295910101114.516.520.524.528.53540.544.54753.559.566727878KRDY RDH RDS————161822.528.5344247.552.554657281.58793.595.5————14.516.520.5263239.545.55052.563.57079.5859194B————10111214.516.518.521.524.527.528.531.531.534.537.540.5E————44.5567810.512.514.513.515.514.516.518.520.5RDYMin MaxFIXED AT 6FIXED AT 7FIXED AT 7FIXED AT 88 209 26.510 3012 4514 60.515.5 6617.5 7819.5 89.521.5 9522.5 10024.5 10025.5 12327 13031 14032 158YRDSMin Max————8910121415.517.519.521.522.524.525.5273132————1416.5202637.5394652.553.5585773.5768193RDHMin MaxSizes 1"–1.5" use URB Series (page 7) or use U5 Series: (Absorptive Silencers Technical Literature booklet #94-1549 page 2)————3343.5466579.591110122.5129.5137140159.5177192205————39515679103114.5138155.5161.5172.5172.5207.5226242266Weight25304075801552004306008801,4101,8252,5502,7953,3003,8855,0257,0308,140© 2011 Universal Acoustic & Emission Technologies, Inc. All rights reserved.Toll-Free: 1-888-300-4272www.universalAET.com94-1547 Rev 09

SpecificationsSURS GroupChamber Type Multi-Use SilencerAttenuation, dB50403020100Typical Attenuation Curve63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, HzPressure Vessel ConstructionSilencers may be fabricated in accordance withDiv. 1, Section VIII—ASME Code for UnfiredPressure Vessels. Dimensions are similarto standard models, but material typesand thicknesses are selected to meet coderequirements. Prices are quoted on application tomeet your pressure and temperature conditions.SURS Series blower silencers are heavy-duty, allwelded steel construction, suitable for applicationas either and inlet or discharge silencer on rotarypositive. These units are designed for blowersrunning above critical transition speed, andtherefore, no acoustic packing material is includedin the design. Instead, these units have a speciallydesigned, high-performance, three chamber systemwhich incorporates a diffuser on the blower sideof the silencer units. The unit will provide excellentpulse control and is designed for themost demanding applications.Sizes smaller than four inches are equipped withstandard male threaded pipe nipples, while the 4"and larger units have flanged connections drilled to125/150 lb ANSI specifications. The SURS Seriesemploys a high-heat aluminum paint system.The SURS is a basic end-in, end-out configuration.A low-side inlet model is designated as the SURSYSeries; the SURSY is fundamentally identical to theSURS SeriesSURSY Series(Low Side Inlet)SURS series in both dimension and attenuationperformance. Both series are designed to operateat pressures to 15 psi. Mounting brackets, shelllagging and other accessories are available for bothseries of blower silencers.YYKKCombination Chamber Type Multi-Use Discharge SilencersSURSSURSYModel Part Model PartSURS-2SURS-2.5SURS-3SURS-3.5SURS-4SURS-5SURS-6SURS-8SURS-10SURS-12SURS-14SURS-16SURS-18SURS-2055-A02-SS55-A25-SS55-A03-SS55-A35-SS55-A04-SS*55-A05-SS*55-A06-SS55-A08-SS55-A10-SS55-A12-SS55-A14-SS55-A16-SS55-A18-SS55-A20-SSSURSY-2SURSY-2.5SURSY-3SURSY-3.5SURSY-4SURSY-5SURSY-6SURSY-8SURSY-10SURSY-12SURSY-14SURSY-16SURSY-18SURSY-2055-B02-SS55-B25-SS55-B03-SS55-B35-SS55-B04-SS*55-B05-SS*55-B06-SS55-B08-SS55-B10-SS55-B12-SS55-B14-SS55-B16-SS55-B18-SS55-B20-SS*Specify -TT for male pipe threaded units.P D L N H22.533.545681012141618201212121414*16*18263036364248484040465959717211113613816818118821433333333.53.53.53.53.53.54.534344053536566104129131161174181205YK Min. Max Weight9991010111216.518.521.521.524.527.528.54.54.555.5678101214161820221313152020252541515063514856555565901001651955758001,2751,3801,8152,5202,880© 2011 Universal Acoustic & Emission Technologies, Inc. All rights reserved.Toll-Free: 1-888-300-4272www.universalAET.com94-1547 Rev 010

CBF/CBFI SeriesCompact BlowerInlet Filter-SilencerPressure Vessel ConstructionSilencers may be fabricated in accordance withDiv. 1, Section VIII—ASME Code for UnfiredPressure Vessels. Dimensions are similarto standard models, but material typesand thicknesses are selected to meet coderequirements. Prices are quoted on application tomeet your pressure and temperature conditions.Filter and silencer combined in one unit.The CBF and CBFI have the acoustic capabilities ofthe Universal Silencer RIS Series silencers and thefiltration performance of CC series filters.Reduced cost, overall package size, weight,storage space, freight cost and damage.¹⁄₈" NPTpressure tapCBF Series (outdoor use)WDRemovable weatherhoodfor filter element access¹⁄₈" NPTpressure tapCBFI Series (indoor use)WDRemovable platefor filter element accessApproximately one third the size of conventionalblower silencer, with the added benefit ofexcellent, high-efficiency filtration.Reduced overall package noise without furtheracoustic treatment.Versatile—Suitable for inlet applications inconfined areas, outdoor or indoor, withoutcompromising acoustic or pressure dropperformance.P (nom.)22.53456810Element Part NumberPaper Felt81-0471*81-0471*81-106381-106381-047581-047581-116381-116381-1203*81-1203*81-120581-120581-120781-120781-120981-120912 81-1164 81-1210*Pair of elements required (stacked).Wire81-1036*81-1036*81-103881-103881-104081-104081-120081-120081-1201LP, inches of H 2 O7654321HDKPY70°F200°F300°FPressure Drop Curves0500 1K 1.5K 2K 2.5K 3K 3.5K 4K 4.5K 5K 5.5KVelocity, ft/minLHDKPYModels, Dimensions, Weights and ElementsP (nom.)22.5345681012D8812121616243034CBF/CBFIH Y K CFM CAP Part89.510.515172327.535.539.544.755.257.58.511.513.7517.7519.757799111115.518.520.51201752755007501,1002,2003,0004,30034-702-AA34-725-AA34-703-AA34-704-AA34-705-AA34-706-AA34-708-AA34-710-AA34-712-AANotes: 1. Non-ASME Code construction suitable for 15" Hg vacuum.2. Weights are approximate and do no include the weight of the filter element.CBFWD L Weight Part10101616202030364013.2514.751721.2526323946.4454.5252550608510521533543034-G02-AA34-G25-AA34-G03-AA34-G04-AA34-G05-AA34-G06-AA34-G08-AA34-G10-AA34-G12-AACBFIWD L 1 Weight6.56.510.510.514141717241314.516.520.87525.62531.62537.545.37553.752025405585100195305370© 2011 Universal Acoustic & Emission Technologies, Inc. All rights reserved.Toll-Free: 1-888-300-4272www.universalAET.com94-1547 Rev 011

Pressure Vessel ConstructionSilencers may be fabricated in accordance withDiv. 1, Section VIII—ASME Code for UnfiredPressure Vessels. Dimensions are similarto standard models, but material typesand thicknesses are selected to meet coderequirements. Prices are quoted on application tomeet your pressure and temperature conditions.CB SeriesCompact Blower SilencerPKThis extremely compact blower silencer worksas either an inlet or discharge silencer on rotarypositive blowers. It is about one-third the size ofa standard silencer, and reduces overall packagesize, cost, weight and storage space. The unit’sinternal pack material is suitable for temperaturesup to 325 degrees. The unit is operable inconditions up to 15 psig. Flanged or threadedconnections are available. Exterior surfaces receivea shop coat of rust inhibitive primer.LHDPYPressure Drop CurvesAttenuation, dB50403020100Typical Attenuation Curve63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, HzCompact Blower SilencersP, inches of H 2 O765432170°F200°F300°F0500 1K 1.5K 2K 2.5K 3K 3.5K 4K 4.5K 5K 5.5KVelocity, ft/minModelCB-2CB-2.5CB-3CB-4CB-5CB-6CB-8CB-10CB-12Part Number P (nom.) D L H Y K Weight56-702-AA56-725-AA56-703-AA56-704-AA56-705-AA56-706-AA56-708-AA56-710-AA56-712-AA22.534568101288121216162430341112.513.518202631394389.510.515172327.535.539.544.755.257.58.511.513.7517.7519.757799111115.518.520.51520405075105250440510CFM CAP1201872704807501,0801,9203,0004,320© 2011 Universal Acoustic & Emission Technologies, Inc. All rights reserved.Toll-Free: 1-888-300-4272www.universalAET.com94-1547 Rev 012

UNI-BASEUltra-Wide BasePlates/ComponentsRotary Positive BlowersThese wide base plate products accommodatea variety of blower package designs. The UNI-BASE package and the USI-BASE base plateuse the same basic base plate and dischargesilencer. The UNI-BASE package includes theUniversal Silencer model URBN high-side inletsilencer and CCF inlet air filter, while the UNI-BASE base plate is only the basic plate and theURBY discharge silencer. Please see page 2 forperformance and sizing information for the URBYseries silencers, page 2 for information on theURBN series silencers, and page 9 in Filters andFilter-Silencers (#94-1553) for performance data,weights and dimensions of CCF filters.UNI-BASE PackageCCF (see Filter and Filter-SilencersTechnical Literature #94-1553 page 9)URBN (see page 15)URBY (see page 7)UNI-BASE Base Plate OnlyURBY (see page 7)UNI-BASE Base Plates/Components Part NumbersSize22.53456UNI-BASE Package80-187380-187480-187580-187680-187780-1878Base Plate Only URBN Only URBY Only CCF Only55-202-ABP55-225-ABP55-203-ABP55-204-ABP55-205-ABP55-206-ABP55-502-AA55-525-AA55-503-AA55-504-AA55-505-AA55-506-AA55-202-AA55-225-AA55-203-AA55-204-AA55-205-AA55-206-AA34-L02-TT*34-L25-TT*34-L03-TT*34-L04-TT*34-L05-TT*34-L06-TT**Specify “P” at end of part number for unit with pleated paper elements, “F” for pleated felt or “W” for wire mesh.Refer to Filter and Filter-Silencers Technical Literature booklet #94-1553 for filter element details.© 2011 Universal Acoustic & Emission Technologies, Inc. All rights reserved.Toll-Free: 1-888-300-4272www.universalAET.com94-1547 Rev 013

UNI-BASEUltra-Wide BasePlates/ComponentsRotary Positive BlowersDimensions and WeightsUNI-BASE Base Plate (w/URBY)P (nom.) A B C CD D2 E FS22.53944.555.51.51.520.7534565666664———20.8831.537.543.55210.7511.3751215.518.2518.25810101416186.56.757.5813.7510.51314.2515.2516.514.7515.25G H2 J K2 L Q (Dia.) S Y23.527.529.75333535.2516171724.523.526.55668910.257881011123031435062.5693.544.7561112212526.2529.7530.530.5677111212Approx.Weight125160250335460600Notes: 1. Sizes 2"–3" URBY discharge silencers are shipped standard with male pipe threaded connections. 4" and 5" URBY discharge silencers are shipped standard with malepipe threaded discharge connections and plain pipe blower connections. 6" URBY discharge silencers are shipped standard with flanged discharge connection drilledto 125/150 lb. ANSI specifications and plain pipe blower connections.2. Sizes 2"–3" URBY discharge silencers have a 2" NPT relief valve coupling and plug. Sizes 4"–6" URBY discharge silencers have a 3" NPT relief valve coupling and plug.URBN SilencersP1/P2 (nom.) D1 H1 K1 Y1 Y2 Approx. Weight22.5345681010141618272840476066Notes: 1. Sizes 2"–4" URBN inlet silencers are shipped with male pipe threaded inlets and plain pipe outlets. Sizes 5" and 6" URBN inlet silencers are shipped standard withflanged inlet connections drilled to 125/150 lb ANSI specifications and plain pipe outlets.78810111267766.583.54.54.55.56.57.525355080140170© 2011 Universal Acoustic & Emission Technologies, Inc. All rights reserved.Toll-Free: 1-888-300-4272www.universalAET.com94-1547 Rev 014

All information correct at time of printing. Universal has a policy ofcontinuous improvement. Therefore we reserve the right to change thespecifications of these silencers without notice.Weld-On Attachment BracketsAll dimensions are in inches unless otherwise stated. All weights arein lbs and are approximate.Universal provides several options for attaching the silencer to a structure or floor. Verticalsilencer installations have a Type B or D attachment option. Horizontal silencer installationshave a Type E or Type F attachment option. Please indicate attachment option on order. Thebrackets and legs will be factory installed so no field welding is required.(Page 3.23)(Page 3.24)© 2011 Universal Acoustic & Emission Technologies, Inc. All rights reserved.Toll-Free: 1-888-300-4272www.universalAET.com94-1547 Rev 015

All information correct at time of printing. Universal has a policy ofcontinuous improvement. Therefore we reserve the right to change thespecifications of these silencers without notice.All dimensions are in inches unless otherwise stated. All weights arein lbs and are approximate.Weld-On Attachment BracketsType “B” Mounting Brackets*Body Diamter A B C D E10.12 C4 7.25 4.0 2.0 0.500 14.311.12 C4 7.25 4.0 2.0 0.500 15.312.12 C4 7.25 4.0 2.0 0.500 16.314.12 C4 7.25 4.0 2.0 0.500 18.316.12 C4 7.25 4.0 2.0 0.500 20.318.12 C4 7.25 4.0 2.0 0.500 22.322.12 C4 7.25 4.0 2.0 0.500 26.426.12 C4 7.25 4.0 2.0 0.625 30.430.12 C4 7.25 4.0 2.0 0.625 34.436.12 C4 7.25 4.0 2.0 0.625 40.442.25 C4 7.25 4.0 2.0 0.625 46.548.25 C4 7.25 4.0 2.0 0.625 52.554.25 C4 7.25 4.0 2.0 0.875 58.560.25 C4 7.25 4.0 2.0 0.875 64.5*Add “N” to the part number when ordering a silencer with Type B brackets (for example, a 61308F would be ordered as 61308N).© 2011 Universal Acoustic & Emission Technologies, Inc. All rights reserved.Toll-Free: 1-888-300-4272www.universalAET.com94-1547 Rev 016

All information correct at time of printing. Universal has a policy ofcontinuous improvement. Therefore we reserve the right to change thespecifications of these silencers without notice.Weld-On LegsAll dimensions are in inches unless otherwise stated. All weights arein lbs and are approximate.Type “D” Mounting Brackets* - LegsBody Diameter A Hole Diameter Foot Width Foot Gauge Leg Angles F10.12 10.0 0.500 6.0 0.5 2.0 2.0 .187 5.011.12 11.0 0.500 6.0 0.5 2.0 2.0 .187 5.012.12 12.0 0.500 6.0 0.5 2.0 2.0 .187 5.014.12 14.0 0.500 6.0 0.5 2.0 2.0 .187 5.016.12 16.0 0.500 6.0 0.5 2.0 2.0 .187 5.018.12 18.0 0.500 6.0 0.5 2.0 2.0 .187 5.022.12 22.0 0.625 6.0 0.5 3.0 3.0 .500 5.026.12 26.0 0.625 6.0 0.5 3.0 3.0 .500 5.030.12 30.0 0.625 6.0 0.5 3.0 3.0 .500 5.036.12 36.0 0.875 6.0 0.5 3.0 3.0 .500 5.042.25 42.0 0.875 7.0 0.5 4.0 4.0 .500 5.048.25 48.0 1.125 7.0 0.5 4.0 4.0 .500 5.054.25 54.0 1.125 7.0 0.5 4.0 4.0 .500 5.060.25 60.0 1.125 7.0 0.5 4.0 4.0 .500 5.0*Add “E” to the part number when ordering a silencer with Type D brackets (for example, a 61308F would be ordered as 61308E).© 2011 Universal Acoustic & Emission Technologies, Inc. All rights reserved.Toll-Free: 1-888-300-4272www.universalAET.com94-1547 Rev 017

All information correct at time of printing. Universal has a policy ofcontinuous improvement. Therefore we reserve the right to change thespecifications of these silencers without notice.All dimensions are in inches unless otherwise stated. All weights arein lbs and are approximate.Weld-On Attachment BracketsType “E” Mounting Brackets*Body Diamter A B C D E10.12 C4 7.25 4.0 2.0 0.500 14.311.12 C4 7.25 4.0 2.0 0.500 15.312.12 C4 7.25 4.0 2.0 0.500 16.314.12 C4 7.25 4.0 2.0 0.500 18.316.12 C4 7.25 4.0 2.0 0.500 20.318.12 C4 7.25 4.0 2.0 0.500 22.322.12 C4 7.25 4.0 2.0 0.500 26.426.12 C4 7.25 4.0 2.0 0.625 30.430.12 C4 7.25 4.0 2.0 0.625 34.436.12 C4 7.25 4.0 2.0 0.625 40.442.25 C4 7.25 4.0 2.0 0.625 46.548.25 C4 7.25 4.0 2.0 0.625 52.554.25 C4 7.25 4.0 2.0 0.875 58.560.25 C4 7.25 4.0 2.0 0.875 64.5*Add “C” to the part number when ordering a silencer with Type E brackets (for example, a 61308F would be ordered as 61308C).© 2011 Universal Acoustic & Emission Technologies, Inc. All rights reserved.Toll-Free: 1-888-300-4272www.universalAET.com94-1547 Rev 018

Notes:Frequently the engine’s flange size is largerthan the required silencer’s connection. Ratherthan use a larger silencer, it is usually moreeconomical to use an oversize reducing flange onthe silencer. Universal offers single reduction anddouble reduction ANSI Flange.Reduction/OversizeFlange KitsReduction Flange: SinglePipe SizeReductionPart Number A D # of Holes B C E Weight5x4 82-1015 4.56 10.00 8 8.50 0.875 0.375 66x5 82-1016 5.63 11.00 8 9.50 0.875 0.500 98x6 82-1017 6.69 13.50 8 11.75 0.875 0.500 14.510x8 82-1018 8.75 16.00 12 14.25 1.000 0.500 1712x10 82-1019 10.88 19.00 12 17.00 1.000 0.500 2614x12 82-1020 12.88 21.00 12 18.75 1.125 0.500 2916x14 82-1021 14.19 23.50 16 21.25 1.125 0.500 3718x16 82-1022 16.19 25.00 16 22.75 1.250 0.500 3820x18 82-1023 18.19 27.50 20 25.00 1.250 0.500 4422x20 82-1024 20.19 29.50 20 27.25 1.375 0.500 4724x22 82-1025 22.19 32 20 29.50 1.375 0.500 55Reduction Flange: DoublePipe SizeReductionPart Number A D # of Holes B C E Weight6x4 82-1039 4.56 11.00 8 9.50 0.875 0.500 10.58x5 82-1040 5.63 13.50 8 11.75 0.875 0.500 1610x6 82-1041 6.69 16.00 12 14.25 1.000 0.500 2212x8 82-1042 8.75 19.00 12 17.00 1.000 0.500 3014x10 82-1043 10.88 21.00 12 18.75 1.125 0.500 3416x12 82-1044 12.88 23.50 16 21.25 1.125 0.500 4118x14 82-1045 14.19 25.00 16 22.75 1.250 0.500 4420x16 82-1046 16.19 27.50 20 25.00 1.250 0.500 5222x18 82-1047 18.19 29.50 20 27.25 1.375 0.500 5624x20 82-1048 20.19 32.00 20 29.50 1.375 0.500 6426x22 82-1049 22.19 34.25 24 31.75 1.375 0.750 106© 2011 Universal Acoustic & Emission Technologies, Inc. All rights reserved.Toll-Free: 1-888-300-4272www.universalAET.com94-1547 Rev 020

Field repairs, retrofits and custom projectssometimes require flanges to be installed on abare pipe end. Universal offers weld-on flanges.Each flange kit includes two flanges, gaskets, andbolt and nut for each hole.CompanionFlange KitsDual Mounting Flanges Kits (Threaded)PartNumberA B C D E F G # of Holes Weight40040K 4 7.50 0.750 9.0 1.31 0.94 5.31 8 3040050K 5 8.50 0.875 10.0 1.44 0.94 6.44 8 3540060K 6 9.50 0.875 11.0 1.56 1.00 7.56 8 5440080K 8 11.75 0.875 13.5 1.75 1.12 9.75 8 67A “kit” consists of a mounting flange, a gasket, and one capscrew and nut for eachmounting hole. Available in dual or single flange kits. Listed part number for dual flangekits. Please call for single flange kits.© 2011 Universal Acoustic & Emission Technologies, Inc. All rights reserved.Toll-Free: 1-888-300-4272www.universalAET.com94-1547 Rev 022

Universal1925 Highway 51/138P.O. Box 411Stoughton, WI 53589 USAPhone (608) 873-4272Fax (608) 873-4298www.universalAET.com© 2011 Universal Acoustic & Emission Technologies, Inc. All rights reserved.Toll-Free: 1-888-300-4272www.universalAET.com94-1547 Rev 023