Sound Attenuators - Aerosonics Products

PDHengineer.com Course № M-2029

Sound Attenuators - Aerosonics Products

and Applications

To receive credit for this course

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Sound Attenuators Online Course No. M-2029

Credits: 2 PDH

http://www.pdhengineer.com/index.htm

Introduction Maintaining appropriate sound levels in occupied spaces contributes to a healthy and comfortable indoor environment. While HVAC systems contribute to the overall comfort level of occupants in the space by controlling the temperature and humidity of the indoor air, they can also negatively impact comfort by generating excessive noise if not designed properly. Noise is produced in an HVAC system by various sources, including fans/motors and air moving through ductwork and fittings. The sound propagates from the ductwork into the occupied building spaces through two means: radiated and ductborn sound. Radiated sound propagates out in all directions from the sheet metal housing of duct, fans and fittings; this is sometimes called “breakout” sound. Ductborn sound travels through ductwork and eventually enters occupied spaces through room air outlets. Ductborn sound in HVAC systems must often be reduced to achieve acceptable comfort levels in occupied spaces. The primary type of sound attenuating device is an Absorptive (also called Dissipative) silencer. These devices typically use a baffle arrangement with acoustic fill material to attenuate sound. The sound energy is partially transformed into heat as the air passes through fibers in the filler material. Attenuators are specially designed for particular applications, including low pressure drop, low frequency hospital/clean room applications, elbow installations and packless models using no absorptive fill material. Selecting an Attenuator When selecting a sound attenuator, the engineer needs to know the level of sound attenuation that must be achieved in each octave band. The human ear is most sensitive to sounds in the frequency range of 1 kHz to 4 kHz. Air velocity, pressure drop and airflow direction (supply, return or exhaust fan systems) are all considerations that influence the level of sound attenuation that is achievable when selecting a sound attenuator. Sound attenuators are available in several different lengths. A longer attenuator is used when greater sound attenuation is required, but it is achieved at the expense of additional pressure drop. Appendix A contains catalog information supplied by AeroSonics – a leading provider of sound control products for the HVAC industry. Below is an explanation of the methodology used to select a sound attenuator using the charts provided in AeroSonics’ catalog:

Example A supply duct has a velocity of 500 fpm and requires at least 34 dB of sound attenuation in the 5

th Octave Band (1,000 Hz). The maximum allowable pressure drop through the

attenuator is 0.10 in w.c. Select an appropriate model from AeroSonics’ HP line of sound attenuators. Solution The table below was extracted from AeroSonics’ catalog in Appendix A. It shows Dynamic Insertion loss (dB) vs. velocity (fpm) for the Model HP-36.

• At 500 fpm, the pressure drop is 0.05 in w.c., which is less than the maximum allowable of 0.10 in w.c. (OK)

• At 500 fpm (gray horizontal row) and 1K Hz (gray vertical column), the resulting Dynamic Insertion Loss is 36 dB, which is greater than the minimum required of 34 dB. (OK)

Dynamic Insertion Loss (dB) Octave Band/Center Frequency (Hz)

Model Flow Velocity fpm

Press Drop

1 63

2 125

3 250

4 500

5 1K

6 2K

7 4K

8 8K

-1500 0.43 6 11 17 27 38 32 20 13

-1000 0.19 6 10 16 26 37 32 20 14

-500 0.05 6 10 15 26 37 33 20 14

0 5 9 15 25 37 33 22 14

500 0.05 5 8 14 24 36 33 23 15

1000 0.19 5 8 14 24 36 33 23 15

HP-36

Reverse Flow

Forward Flow

1500 0.43 5 8 14 24 35 34 24 15

Surface Burning Characteristics Local building codes may require fire testing of ducting components used in occupied spaces; this applies to the sound absorbing materials in the sound attenuators also. Sound attenuator manufacturers typically publish ASTM E-84 test results for “Flamespread” and “Smoke Developed”. ASTM E-84 uses a 10 minute surface flame test to determine the degree to which a test specimen allows the spread of flames and the development of smoke relative. The performance of the test specimen is compared to the benchmark materials (mineral fiber cement board and red oak flooring) to determine Flamespread and Smoke Developed ratings.

Independent Testing It is very difficult to obtain accurate sound measurements in the field due to outside noise sources or break-in noise. Sound attenuators should be tested in accordance with ASTM E477 “Standard Method of Testing Duct Liner Materials and Prefabricated Silencers for Acoustical and Airflow Performance” using an independent testing laboratory.

Appendix A

Appendix A contains catalog information from AeroSonics – a leading provider of sound attenuation equipment for the HVAC industry. Below is a list of the engineering data covered in Appendix A: Rectangular Attenuators • Standard Attenuators • Low Frequency Attenuators • Hospital Clean Room Attenuators • Low Frequency Hospital/Clean Room Attenuators • Elbow Attenuators • Packless Attenuators Tubular Silencers • Single Wall Attenuators • Double Wall Attenuators • Low Frequency Attenuators • Packless for Round Ductwork • Packless for Control Valves Acoustical Diffuser Cones for Vane Axial Fans Transfer Silencers Grille Silencers Acoustical Louvers Acoustical/Thermal Enclosures

Q u a l i t y P r o d u c t s f o r E v e r y H V A C A p p l i c a t i o n

Rectangular Attenuators

• Standard Attenuators• Low Frequency Attenuators• Hospital/Clean Room Attenuators• Low Frequency Hospital/Clean Room Attenuators• Elbow Attenuators• Packless Attenuators

SOUND CONTROL PRODUCTS

Standard Attenuators

HPMPLPSELF-NOISE POWER LEVELSSOUND ATTENUATOR INSTALLATION INSTRUCTIONS


Standard Attenuators

Standard attenuators are available in three models for traditional applicationsrequiring broad band noise reduction. Performance data is provided for fourbasic lengths - 36”, 60”, 84”, and 120”. Units are also offered in 48”, 72”, and96” lengths.

Model HP is a standard pressure drop unit ideally suited for system velocitiesat or near 1,000 fpm.

Model MP also provides excellent attenuation values along with a moderatepressure drop at somewhat higher air velocities.

Model LP offers the lowest pressure drop for higher velocity systems.

Special features of our Standard Attenuators are:

• Diffusion angle to improve pressure drop

• Bellmouth entrance to help minimizeturbulence

• 22 gauge galvanized steel casings

• 24 gauge perforated galvanized baffles

• Long strand Fiberglass acoustical fill

• Seams are mastic filled to insure airtightunits to 8” w.g.

• Optional polyethylene, Mylar or fiberglasscloth liners

ASTM E-84 ratings for the acoustical fill are:

• Flamespread 10

• Smoke Developed 10

Components are also available in stainless steel or aluminum construction.

Acoustical performance ratings are based on tests conducted by IntertekTesting Services, formerly ETL Testing Laboratories, Inc., Cortland, New York,in accordance with ASTM E477 “Standard Method of Testing Duct LinerMaterials and Prefabricated Silencers for Acoustical and AirflowPerformance.” Copies of the test reports are available upon request.

AIR

FLOW

Standard Attenuator - Model HPDynamic Insertion Loss (dB)

Octave Band/Center Frequency (Hz)

Model Flow Velocityfpm

PressDrop

163

2125

3250

4500

51K

62K

74K

88K

-1500 0.43 6 11 17 27 38 32 20 13Reverse -1000 0.19 6 10 16 26 37 32 20 14

Flow -500 0.05 6 10 15 26 37 33 20 14HP-36 0 5 9 15 25 37 33 22 14

Forward 500 0.05 5 8 14 24 36 33 23 15Flow 1000 0.19 5 8 14 24 36 33 23 15

1500 0.43 5 8 14 24 35 34 24 15

-1500 0.59 8 18 28 36 42 37 30 18Reverse -1000 0.26 8 17 26 37 45 41 31 19

Flow -500 0.07 8 16 24 38 47 48 32 19HP-60 0 7 15 23 35 48 48 35 21

Forward 500 0.07 7 14 22 35 47 47 35 22Flow 1000 0.26 7 13 21 35 46 46 35 22

1500 0.59 7 13 20 34 45 44 35 23

-1500 0.77 11 24 38 45 46 42 39 23Reverse -1000 0.34 11 23 35 48 52 49 42 24

Flow -500 0.09 9 21 33 49 58 62 44 24HP-84 0 9 20 31 48 58 62 47 27

Forward 500 0.09 9 18 30 47 59 65 47 28Flow 1000 0.34 9 17 28 45 57 59 47 29

1500 0.77 8 17 26 43 54 49 47 30

-1500 1.15 13 29 48 55 62 63 50 34Reverse -1000 0.51 12 29 47 54 62 63 50 34

Flow -500 0.13 12 28 46 52 62 64 49 32HP-120 0 11 28 45 51 63 65 49 32

Forward 500 0.13 10 28 44 50 62 65 49 31Flow 1000 0.51 10 26 43 49 61 66 49 33

1500 1.15 9 25 42 49 60 66 49 34

Forward Flow - characteristic of supply or discharge fan systems.Reverse Flow - typical of return or intake fan systems.

Pressure Drop Calculation for Specific VelocityActual Velocity (fpm) = CFM x 144 ÷ [Height (in.) x Width (in.)]

Pressure Drop = Actual Velocity

1500

2 x Catalog Pressure Drop @ 1500 fpm

Standard Construction Optional Features22 gauge galvanized casings Mylar or polyethylene liners24 gauge perforated baffles Fiberglass cloth linersAcoustic quality Fiberglass media Stainless steel or aluminum construction

Computer program available which provides attenuator performance at actual job conditions.

Standard Attenuator - Model MPDynamic Insertion Loss (dB)



PressDrop

163

2125

3250

4500

51K

62K

74K

88K

-2000 0.40 5 10 13 22 31 22 12 10Reverse -1500 0.23 5 9 13 21 31 22 13 10

Flow -1000 0.10 4 9 13 21 31 23 14 10MP-36 0 3 8 12 21 31 24 16 11

Forward 1000 0.10 5 8 11 20 30 25 17 12Flow 1500 0.23 4 8 11 20 30 25 17 12

2000 0.40 3 7 11 19 29 25 17 12

-2000 0.52 8 15 21 31 37 31 20 13Reverse -1500 0.29 7 14 20 33 39 33 21 13

Flow -1000 0.13 6 13 20 33 41 37 22 13MP-60 0 5 12 18 33 44 40 25 15

Forward 1000 0.13 6 11 18 30 44 42 25 17Flow 1500 0.29 5 11 17 29 43 40 25 17

2000 0.52 5 10 16 29 41 37 26 18

-2000 0.60 10 19 29 40 42 40 27 15Reverse -1500 0.34 9 18 27 44 47 44 28 16

Flow -1000 0.15 8 17 26 45 51 50 29 17MP-84 0 7 16 24 44 56 55 33 20

Forward 1000 0.15 7 14 22 40 58 59 33 22Flow 1500 0.34 7 14 21 39 56 54 34 23

2000 0.60 6 13 20 38 53 49 35 24

-2000 0.84 11 23 38 50 61 59 36 25Reverse -1500 0.47 10 22 38 49 61 58 35 25

Flow -1000 0.21 10 22 37 48 60 58 34 24MP-120 0 9 22 37 47 59 57 33 22

Forward 1000 0.21 9 21 37 46 58 57 34 25Flow 1500 0.47 9 21 37 46 58 57 34 25

2000 0.84 8 21 36 45 58 56 35 25




2000




Standard Attenuator - Model LPDynamic Insertion Loss (dB)



PressDrop

163

2125

3250

4500

51K

62K

74K

88K

-2000 0.20 5 8 11 18 27 18 11 9Reverse -1500 0.11 5 7 10 18 27 18 11 8

Flow -1000 0.05 5 7 10 18 27 19 11 8LP-36 0 4 6 9 17 27 19 12 9

Forward 1000 0.05 5 7 9 16 27 20 13 10Flow 1500 0.11 5 7 9 16 27 20 13 10

2000 0.20 4 6 9 16 26 20 14 10

-2000 0.23 6 11 16 29 36 29 16 11Reverse -1500 0.13 6 10 15 29 39 29 16 10

Flow -1000 0.06 6 10 15 28 40 30 17 10LP-60 0 5 9 14 27 42 31 18 12

Forward 1000 0.06 6 9 13 25 42 32 19 13Flow 1500 0.13 6 9 13 25 41 32 19 13

2000 0.23 6 8 13 24 40 32 20 13

-2000 0.26 8 14 20 39 45 39 20 12Reverse -1500 0.15 8 13 20 39 50 40 21 12

Flow -1000 0.07 7 13 19 38 52 41 22 12LP-84 0 7 12 18 36 56 42 24 14

Forward 1000 0.07 7 11 17 33 56 43 25 16Flow 1500 0.15 7 11 17 33 55 43 25 16

2000 0.26 7 10 16 32 54 43 26 16

-2000 0.30 9 18 27 48 61 49 34 17Reverse -1500 0.17 9 18 26 47 60 49 33 17

Flow -1000 0.08 8 17 26 46 60 48 32 17LP-120 0 7 16 26 45 58 48 31 16

Forward 1000 0.08 7 15 26 44 56 48 30 17Flow 1500 0.17 7 15 26 44 56 48 30 17

2000 0.30 7 14 26 43 56 48 31 17




2000





Self-noise Power Levels

Self-Noise Power Levels, dB re 10 Watts-12


Model Velocityfpm

163

2125

3250

4500

51K

62K

74K

88K

1000 53 44 38 37 41 44 38 31HP 1500 58 53 47 46 47 54 53 48

2000 71 62 55 54 52 59 63 59

1000 55 48 37 35 37 35 27 27MP 2000 61 57 52 49 48 55 55 50

2500 70 63 58 55 53 59 62 58

1000 53 42 37 35 35 29 22 27LP 2000 60 56 52 49 48 55 51 44

2500 67 62 57 55 52 59 59 53

1000 56 41 41 47 46 41 30 30LHP 1500 56 47 45 48 53 59 56 48

2000 63 55 49 51 54 63 67 60

1000 47 39 37 37 39 39 24 22LMP 1500 50 43 47 48 45 46 36 30

2000 52 49 59 55 52 54 49 40

1000 45 37 34 35 36 36 22 20LLP 1500 46 41 40 39 41 44 30 29

2000 47 44 48 47 48 53 45 39

1000 44 36 33 34 35 35 21 19SLLP 1500 45 40 39 38 40 43 29 28

2000 46 43 47 46 47 52 44 38

Area Correction Factors - Listed self-noise power levels are for silencers with a face area of four (4)square feet. For silencers with different face areas, the following values must be added to those inthe table.

Face area (sq. ft.) 0.5 1 2 4 6 8 16 32 64 128

PWL CorrectionFactors, dB

-9 -6 -3 0 2 3 6 9 12 15

Sound Attenuator Installation InstructionsTypical connections to ducts for single units include:

Slip or lap joint using screws and sealing tape.

Flanged, gasketed, and bolted connections (gasket & bolts by others).

Multiple units utilize the same connection methods as used for single units. Individual unitsare stacked atop and beside each other to form the overall bank. To stabilize the bank, usedraw bands or tack welds to hold the casings in position. Take special care to sealbetween the edges of each unit to prevent air from passing between the units. Nose clipsor sheet metal screws with a caulk or sealant is a common solution in this area.

Attenuators have no moving parts. Only general cleaning is required periodically, normallydone when the duct itself is inspected and cleaned. Wiping the interior wall of the units witha damp cloth will generally remove any dust and dirt build-up. Minimal amounts of watercan be used to remove heavy soil, but saturating the insulation is not recommended.

Low Frequency Attenuators

LHPLMPLLPSELF-NOISE POWER LEVELSSOUND ATTENUATOR INSTALLATION INSTRUCTIONS



Low Frequency attenuators are available in three models for specificapplications requiring increased 2nd & 3rd octave band noise reduction.Performance data is provided for four basic lengths - 36”, 60”, 84”, and 120”.Units are also offered in 48”, 72”, and 96” lengths.

Model LHP is a standard pressure drop unit ideally suited for systemvelocities below 1,000 fpm.

Model LMP also provides excellent low frequency attenuation values alongwith a moderate pressure drop at somewhat higher air velocities.

Model LLP offers a lower pressure drop for higher velocity systems.

Special features of our Low Frequency Attenuators are:







• Optional polyethylene, Mylar or fiberglasscloth liners


• Flamespread 10




AIR

FLOW

Low Frequency Attenuator - Model LHPDynamic Insertion Loss (dB)



PressDrop

163

2125

3250

4500

51K

62K

74K

88K

-1500 1.48 8 13 21 27 31 25 19 13Reverse -1000 0.66 8 12 20 27 30 25 19 13

Flow -500 0.17 7 12 19 26 29 26 18 12LHP-36 0 7 12 19 26 29 26 18 12

Forward 500 0.17 7 12 19 25 29 26 17 12Flow 1000 0.66 7 12 19 24 28 27 16 13

1500 1.48 7 11 18 23 27 28 15 14

-1500 1.62 11 21 30 35 43 31 23 14Reverse -1000 0.72 11 21 28 35 42 32 23 14

Flow -500 0.18 11 20 28 33 41 32 21 13LHP-60 0 10 19 27 32 41 33 20 13

Forward 500 0.18 10 19 27 31 40 33 20 13Flow 1000 0.72 10 18 26 30 39 33 20 14

1500 1.62 10 17 25 30 38 33 20 14

-1500 2.11 15 26 40 48 52 35 27 17Reverse -1000 0.94 15 26 39 47 51 35 27 16

Flow -500 0.24 13 25 39 47 51 35 26 16LHP-84 0 13 24 37 46 50 36 25 16

Forward 500 0.24 13 23 36 45 49 36 24 17Flow 1000 0.94 13 22 35 45 47 37 24 17

1500 2.11 12 21 35 44 46 37 23 18

-1500 2.70 17 31 49 52 51 43 36 20Reverse -1000 1.20 17 31 49 52 52 43 35 19

Flow -500 0.30 16 30 49 51 52 44 35 19LHP-120 0 15 30 48 51 52 44 34 18

Forward 500 0.30 15 29 46 51 51 44 32 18Flow 1000 1.20 14 28 46 51 51 45 32 19

1500 2.70 14 27 45 50 51 46 31 19





2



Low Frequency Attenuator - Model LMPDynamic Insertion Loss (dB)



PressDrop

163

2125

3250

4500

51K

62K

74K

88K

-2000 0.80 7 9 18 21 18 15 11 9Reverse -1500 0.45 7 9 17 20 18 14 11 9

Flow -1000 0.20 6 8 16 19 17 14 11 9LMP-36 0 5 8 15 19 17 14 10 9

Forward 1000 0.20 5 8 15 19 16 13 10 8Flow 1500 0.45 5 8 15 19 16 13 10 8

2000 0.80 5 7 15 18 16 13 10 8

-2000 0.96 10 16 27 33 30 26 15 11Reverse -1500 0.54 10 16 26 32 29 25 14 11

Flow -1000 0.24 9 15 25 30 29 25 14 10LMP-60 0 8 14 24 30 28 23 14 10

Forward 1000 0.24 7 13 22 28 26 21 14 9Flow 1500 0.54 7 13 22 28 26 21 13 9

2000 0.96 7 13 22 27 26 20 13 9

-2000 1.08 12 19 33 44 41 29 18 14Reverse -1500 0.61 12 19 32 43 40 29 17 13

Flow -1000 0.27 11 18 32 42 40 29 17 13LMP-84 0 11 18 31 42 40 29 17 13

Forward 1000 0.27 11 17 30 40 39 28 16 13Flow 1500 0.61 11 17 29 40 39 28 16 13

2000 1.08 10 16 28 39 39 28 16 12

-2000 1.24 15 25 43 51 48 34 22 17Reverse -1500 0.70 14 24 43 50 49 34 22 17

Flow -1000 0.31 14 24 42 50 49 34 21 16LMP-120 0 13 23 42 50 49 34 21 16

Forward 1000 0.31 13 23 41 50 49 33 20 16Flow 1500 0.70 13 23 40 50 49 33 20 16

2000 1.24 12 22 39 49 48 33 19 16





2



Low Frequency Attenuator - Model LLPDynamic Insertion Loss (dB)



PressDrop

163

2125

3250

4500

51K

62K

74K

88K

-2000 0.48 4 7 13 18 16 12 12 10Reverse -1500 0.27 4 7 12 17 15 12 12 9

Flow -1000 0.12 4 7 12 17 15 12 12 9LLP-36 0 3 6 12 16 15 11 11 9

Forward 1000 0.12 3 5 11 15 15 10 10 8Flow 1500 0.27 3 5 11 15 15 10 10 8

2000 0.48 3 5 11 14 14 9 9 7

-2000 0.52 7 12 18 25 24 18 13 12Reverse -1500 0.29 7 12 18 25 24 18 13 12

Flow -1000 0.13 6 11 18 24 23 17 12 11LLP-60 0 6 10 17 23 22 17 12 10

Forward 1000 0.13 6 10 17 22 20 16 11 10Flow 1500 0.29 6 10 17 22 20 16 11 10

2000 0.52 6 9 16 21 20 15 10 10

-2000 0.56 10 14 24 32 30 24 16 12Reverse -1500 0.31 10 14 24 32 30 24 16 12

Flow -1000 0.14 9 13 23 32 29 24 15 12LLP-84 0 9 13 22 32 29 24 15 11

Forward 1000 0.14 9 12 20 30 27 22 14 10Flow 1500 0.31 9 12 20 30 27 21 14 10

2000 0.56 8 12 20 29 27 20 13 10

-2000 0.60 11 19 31 43 40 27 20 15Reverse -1500 0.34 11 19 31 43 40 27 20 15

Flow -1000 0.15 11 18 31 43 40 27 19 15LLP-120 0 11 17 30 42 39 26 19 15

Forward 1000 0.15 10 17 30 41 39 26 18 14Flow 1500 0.34 10 17 30 41 39 26 18 14

2000 0.60 9 16 29 40 39 26 18 14




2000








Model Velocityfpm

163

2125

3250

4500

51K

62K

74K

88K

1000 53 44 38 37 41 44 38 31HP 1500 58 53 47 46 47 54 53 48

2000 71 62 55 54 52 59 63 59

1000 55 48 37 35 37 35 27 27MP 2000 61 57 52 49 48 55 55 50

2500 70 63 58 55 53 59 62 58

1000 53 42 37 35 35 29 22 27LP 2000 60 56 52 49 48 55 51 44

2500 67 62 57 55 52 59 59 53

1000 56 41 41 47 46 41 30 30LHP 1500 56 47 45 48 53 59 56 48

2000 63 55 49 51 54 63 67 60

1000 47 39 37 37 39 39 24 22LMP 1500 50 43 47 48 45 46 36 30

2000 52 49 59 55 52 54 49 40

1000 45 37 34 35 36 36 22 20LLP 1500 46 41 40 39 41 44 30 29

2000 47 44 48 47 48 53 45 39

1000 44 36 33 34 35 35 21 19SLLP 1500 45 40 39 38 40 43 29 28

2000 46 43 47 46 47 52 44 38


Face area (sq. ft.) 0.5 1 2 4 6 8 16 32 64 128


-9 -6 -3 0 2 3 6 9 12 15

Hospital/Clean Room Attenuators

SPCMPCLPCSELF-NOISE POWER LEVELSSOUND ATTENUATOR INSTALLATION INSTRUCTIONS


Hospital/Clean Room Attenuators

Hospital/Clean Room attenuators are available in three models, specificallyengineered for sensitive area applications requiring broad band noisereduction coupled with erosion proof acoustic fill. Performance data isprovided for four basic lengths - 36”, 60”, 84”, and 120”. Units are also offeredin 48”, 72”, and 96” lengths.

Model SPC is a standard pressure drop unit ideally suited for systemvelocities at or near 1,000 fpm.

Model MPC also provides excellent attenuation values along with a moderatepressure drop at somewhat higher air velocities.

Model LPC offers the lowest pressure drop for higher velocity systems.

Special features of our Hospital/Clean Room Attenuators are:





• Acoustic fill encapsulated in polyethylene toeliminate erosion and absorption of gases

• Acoustic stand-off between the perforatedbaffle and the acoustic fill to enhanceperformance

• Seams are mastic filled to insure airtight units to 8” w.g.

ASTM E-84 ratings for the assembled unit:

• Flamespread 0



Acoustical performance ratings are based on tests conducted by Intertek TestingServices, formerly ETL Testing Laboratories, Inc., Cortland, New York, in accordancewith ASTM E477 “Standard Method of Testing Duct Liner Materials and PrefabricatedSilencers for Acoustical and Airflow Performance.” Copies of the test reports areavailable upon request.

AIR

FLOW

Hospital/Clean Room Attenuator - Model SPCDynamic Insertion Loss (dB)



PressDrop

163

2125

3250

4500

51K

62K

74K

88K

-1500 0.52 8 12 17 25 34 35 31 10Reverse -1000 0.23 7 10 16 24 33 34 30 10

Flow -500 0.06 7 10 15 24 33 34 30 10SPC-36 0 7 9 15 23 33 34 30 10

Forward 500 0.06 7 9 14 21 32 34 29 10Flow 1000 0.23 6 8 14 21 32 34 29 10

1500 0.52 6 8 13 20 32 33 29 10

-1500 0.74 13 14 21 33 48 54 35 12Reverse -1000 0.32 11 12 21 31 47 53 35 11

Flow -500 0.08 10 12 20 30 47 53 35 11SPC-60 0 10 12 20 30 46 52 34 11

Forward 500 0.08 9 11 19 29 46 51 34 12Flow 1000 0.32 9 11 19 28 46 51 34 12

1500 0.74 8 10 17 28 46 50 34 13

-1500 0.95 14 16 25 42 52 58 46 14Reverse -1000 0.42 14 15 24 40 51 56 46 14

Flow -500 0.11 13 14 23 40 50 56 45 14SPC-84 0 12 14 22 39 50 55 44 15

Forward 500 0.11 12 13 22 38 50 55 44 16Flow 1000 0.42 12 13 22 38 49 54 43 17

1500 0.95 11 12 20 36 49 52 41 17

-1500 1.33 17 18 32 47 61 64 48 16Reverse -1000 0.59 17 18 30 46 59 62 47 16

Flow -500 0.15 16 18 29 46 57 60 45 17SPC-120 0 15 17 28 46 55 58 45 17

Forward 500 0.15 14 16 27 45 54 57 44 17Flow 1000 0.59 14 16 27 44 53 56 43 18

1500 1.33 13 16 26 42 53 55 43 18





2

Standard Construction Optional Features22 gauge galvanized casings Stainless steel or aluminum construction24 gauge perforated bafflesAcoustic Fill encapsulated in polyethylene to eliminate erosion and absorption of gases


Hospital/Clean Room Attenuator - Model MPCDynamic Insertion Loss (dB)



PressDrop

163

2125

3250

4500

51K

62K

74K

88K

-2000 0.40 8 10 14 20 27 29 22 8Reverse -1500 0.23 7 9 12 18 26 27 21 8

Flow -1000 0.10 6 8 11 17 25 26 21 8MPC-36 0 6 7 10 16 25 26 20 8

Forward 1000 0.10 6 7 10 15 24 26 19 9Flow 1500 0.23 5 7 10 15 24 25 19 9

2000 0.40 5 6 9 14 22 25 19 9

-2000 0.52 10 13 17 28 39 42 26 11Reverse -1500 0.29 10 12 16 26 39 42 26 10

Flow -1000 0.13 9 11 16 24 38 42 25 10MPC-60 0 8 10 15 23 38 41 25 10

Forward 1000 0.13 8 9 14 21 38 41 25 11Flow 1500 0.29 7 8 12 21 37 40 25 11

2000 0.52 7 8 12 20 36 39 24 12

-2000 0.60 12 14 22 34 43 49 33 14Reverse -1500 0.34 11 13 20 32 42 49 33 12

Flow -1000 0.15 11 13 19 31 41 48 32 12MPC-84 0 10 12 18 29 40 48 31 12

Forward 1000 0.15 10 11 18 28 39 47 30 14Flow 1500 0.34 10 11 17 28 39 45 28 15

2000 0.60 9 10 17 27 37 45 28 16

-2000 0.84 14 16 25 39 51 59 42 15Reverse -1500 0.47 13 16 24 37 50 58 41 14

Flow -1000 0.21 13 16 22 36 48 56 40 14MPC-120 0 12 15 21 36 45 53 38 15

Forward 1000 0.21 12 14 20 34 44 51 37 16Flow 1500 0.47 11 14 20 32 43 50 37 17

2000 0.84 11 13 20 32 43 50 35 17




2000




Hospital/Clean Room Attenuator - Model LPCDynamic Insertion Loss (dB)



PressDrop

163

2125

3250

4500

51K

62K

74K

88K

-2000 0.20 5 6 8 10 17 18 11 7Reverse -1500 0.11 5 6 7 10 17 18 11 6

Flow -1000 0.05 5 6 7 10 17 19 11 6LPC-36 0 4 5 6 9 17 19 12 7

Forward 1000 0.05 5 6 6 8 17 20 13 8Flow 1500 0.11 4 5 6 8 16 20 14 8

2000 0.20 4 5 6 7 15 20 14 8

-2000 0.23 7 9 13 19 28 28 16 8Reverse -1500 0.13 6 8 13 19 29 29 16 7

Flow -1000 0.06 6 8 13 18 30 30 17 7LPC-60 0 5 7 11 17 32 31 18 9

Forward 1000 0.06 6 7 10 15 32 32 19 10Flow 1500 0.13 6 6 10 14 31 32 20 10

2000 0.23 5 6 9 13 29 32 20 10

-2000 0.26 8 11 15 24 30 39 20 10Reverse -1500 0.15 8 10 15 24 32 40 21 10

Flow -1000 0.07 7 10 14 23 34 41 22 10LPC-84 0 7 9 13 21 38 42 24 12

Forward 1000 0.07 7 8 12 18 38 43 25 14Flow 1500 0.15 7 7 11 17 36 43 26 14

2000 0.26 6 7 10 16 34 43 26 15

-2000 0.30 9 14 17 28 43 49 34 13Reverse -1500 0.17 9 14 16 27 42 49 33 13

Flow -1000 0.08 8 13 16 26 42 48 32 13LPC-120 0 7 12 16 25 40 48 31 14

Forward 1000 0.08 7 11 16 24 39 48 30 15Flow 1500 0.17 7 10 16 23 38 48 30 15

2000 0.30 7 9 15 22 38 48 31 15




2000








Model Velocityfpm

163

2125

3250

4500

51K

62K

74K

88K

1000 63 50 42 41 44 44 38 34SPC 1500 69 58 50 49 50 55 55 52

2000 83 75 60 59 57 61 66 65

1000 55 48 37 35 37 35 27 27MPC 1500 61 57 52 49 48 55 55 50

2000 70 63 58 55 53 59 62 58

1000 53 42 36 33 35 29 22 27LPC 1500 60 56 51 47 46 53 51 44

2000 67 62 56 55 52 59 59 53

1000 56 41 41 47 46 41 30 30LSPC 1500 56 47 45 48 53 59 56 48

2000 63 55 49 51 54 63 67 60

1000 47 39 37 37 39 39 24 22LMPC 1500 50 43 47 48 45 46 36 30

2000 52 49 59 55 52 54 49 40

1000 45 37 34 35 36 36 22 20LLPC 1500 46 41 40 39 41 44 30 29

2000 47 44 48 47 48 53 45 39


Face area (sq. ft.) 0.5 1 2 4 6 8 16 32 64 128


-9 -6 -3 0 2 3 6 9 12 15

Low Frequency Hospital/Clean Room Attenuators

LSPCLMPCLLPCSELF-NOISE POWER LEVELSSOUND ATTENUATOR INSTALLATION INSTRUCTIONS


Low Frequency Hospital/Clean Room Attenuators

Low Frequency Hospital/Clean Room attenuators are available in threemodels, specifically engineered for sensitive area applications requiringincreased 2nd and 3rd octave band noise reduction coupled with erosion proofacoustic fill. Performance data is provided for four basic lengths - 36”, 60”,84”, and 120”. Units are also offered in 48”, 72”, and 96” lengths.

Model LSPC is a standard pressure drop unit ideally suited for systemvelocities at or near 1,000 fpm.

Model LMPC also provides excellent attenuation values along with a moderatepressure drop at somewhat higher air velocities.

Model LLPC offers the lowest pressure drop for higher velocity systems.

Special features of our Low Frequency Hospital/Clean Room Attenuators are:





• Acoustic fill encapsulated in polyethylene toeliminate erosion and absorption of gases

• Acoustic stand-off between the perforatedbaffle and the acoustic fill to enhanceperformance


ASTM E-84 ratings for the assembled unit:

• Flamespread 0




AIR

FLOW

Low Frequency

Hospital/Clean Room Attenuator - Model LSPCDynamic Insertion Loss (dB)



PressDrop

163

2125

3250

4500

51K

62K

74K

88K

-1500 1.48 9 12 17 21 27 22 18 8Reverse -1000 0.66 9 12 17 21 27 22 18 8

Flow -500 0.17 9 12 17 21 26 22 17 7LSPC-36 0 8 12 16 20 25 23 17 7

Forward 500 0.17 8 12 16 19 25 24 17 8Flow 1000 0.66 8 12 16 19 24 24 16 8

1500 1.48 8 12 16 19 24 24 16 8

-1500 1.62 12 21 24 27 38 28 22 9Reverse -1000 0.72 12 21 24 27 38 28 22 9

Flow -500 0.18 12 19 23 26 38 29 21 9LSPC-60 0 11 18 23 25 37 30 19 8

Forward 500 0.18 11 17 23 24 36 30 19 9Flow 1000 0.72 11 17 22 23 35 30 19 9

1500 1.62 11 17 22 23 35 30 19 9

-1500 2.11 16 25 33 37 45 32 26 13Reverse -1000 0.94 16 25 33 37 45 32 26 13

Flow -500 0.24 15 24 32 36 45 32 25 12LSPC-84 0 14 23 31 35 45 33 24 11

Forward 500 0.24 14 22 31 35 43 33 23 12Flow 1000 0.94 14 21 30 35 42 34 23 12

1500 2.11 14 21 30 35 42 34 23 12

-1500 2.70 18 30 42 44 47 39 34 16Reverse -1000 1.20 18 30 42 44 47 39 34 16

Flow -500 0.30 17 29 41 43 47 40 33 15LSPC-120 0 16 29 41 43 47 40 33 15

Forward 500 0.30 16 28 40 43 46 40 32 15Flow 1000 1.20 15 27 39 43 46 41 31 16

1500 2.70 15 27 39 43 46 41 31 16





2


Computer program available, which provides attenuator performance at actual job conditions.

Low Frequency

Hospital/Clean Room Attenuator - Model LMPCDynamic Insertion Loss (dB)



PressDrop

163

2125

3250

4500

51K

62K

74K

88K

-2000 0.80 8 9 14 16 16 13 10 6Reverse -1500 0.45 7 8 14 15 15 12 10 6

Flow -1000 0.20 7 8 14 15 15 12 10 6LMPC-36 0 6 8 13 15 14 12 9 6

Forward 1000 0.20 6 8 13 15 14 12 9 6Flow 1500 0.45 6 8 13 15 15 11 9 5

2000 0.80 6 7 13 14 15 11 9 5

-2000 0.96 10 15 23 26 27 23 14 9Reverse -1500 0.54 10 14 21 24 26 22 13 8

Flow -1000 0.24 10 14 21 24 26 22 13 8LMPC-60 0 9 13 20 23 25 21 16 8

Forward 1000 0.24 9 13 20 23 25 21 16 8Flow 1500 0.54 9 12 19 22 24 20 12 7

2000 0.96 9 12 19 21 23 18 12 7

-2000 1.08 13 19 28 36 30 26 147 12Reverse -1500 0.61 12 18 27 35 30 26 17 11

Flow -1000 0.27 12 18 27 35 30 26 17 11LMPC-84 0 12 17 26 33 30 25 16 11

Forward 1000 0.27 12 17 26 33 30 25 16 11Flow 1500 0.61 12 17 25 32 29 25 16 11

2000 1.08 11 16 24 32 29 24 15 10

-2000 1.24 16 25 35 39 37 31 21 15Reverse -1500 0.70 15 23 33 38 37 31 20 14

Flow -1000 0.31 15 23 33 38 37 31 20 14LMPC-120 0 14 22 33 38 36 31 20 14

Forward 1000 0.31 14 22 33 38 36 31 20 14Flow 1500 0.70 14 22 32 38 35 30 20 14

2000 1.24 13 21 32 37 35 30 20 14





2



Low Frequency

Hospital/Clean Room Attenuator - Model LLPCDynamic Insertion Loss (dB)



PressDrop

163

2125

3250

4500

51K

62K

74K

88K

-2000 0.48 5 7 11 14 14 11 9 6Reverse -1500 0.27 5 7 10 13 14 11 9 6

Flow -1000 0.12 5 7 10 13 13 11 8 6LLPC-36 0 4 6 10 13 13 11 8 6

Forward 1000 0.12 4 5 9 12 13 10 7 5Flow 1500 0.27 4 5 9 12 13 10 7 5

2000 0.48 4 5 9 11 12 10 6 5

-2000 0.52 8 12 15 20 22 16 11 8Reverse -1500 0.29 8 12 15 20 22 16 11 8

Flow -1000 0.13 8 12 15 19 21 15 10 7LLPC-60 0 7 11 15 18 20 15 10 6

Forward 1000 0.13 7 10 14 18 19 15 10 6Flow 1500 0.29 7 10 14 18 19 15 10 6

2000 0.52 7 9 13 17 19 14 9 6

-2000 0.56 11 14 21 25 27 22 13 9Reverse -1500 0.31 11 14 21 25 27 22 13 9

Flow -1000 0.14 10 13 20 25 28 22 13 8LLPC-84 0 10 13 19 25 28 22 13 8

Forward 1000 0.14 10 12 18 24 26 20 12 8Flow 1500 0.31 10 12 18 24 26 20 12 8

2000 0.56 10 12 17 23 26 20 11 7

-2000 0.60 12 19 26 33 36 24 16 11Reverse -1500 0.34 12 19 26 33 36 24 16 11

Flow -1000 0.15 12 18 26 33 36 24 15 11LLPC-120 0 11 17 25 32 35 23 15 11

Forward 1000 0.15 11 16 25 30 35 23 14 10Flow 1500 0.34 11 16 25 30 35 23 14 10

2000 0.60 11 16 24 29 35 23 14 10





2







Model Velocityfpm

163

2125

3250

4500

51K

62K

74K

88K

1000 63 50 42 41 44 44 38 34SPC 1500 69 58 50 49 50 55 55 52

2000 83 75 60 59 57 61 66 65

1000 55 48 37 35 37 35 27 27MPC 1500 61 57 52 49 48 55 55 50

2000 70 63 58 55 53 59 62 58

1000 53 42 36 33 35 29 22 27LPC 1500 60 56 51 47 46 53 51 44

2000 67 62 56 55 52 59 59 53

1000 56 41 41 47 46 41 30 30LSPC 1500 56 47 45 48 53 59 56 48

2000 63 55 49 51 54 63 67 60

1000 47 39 37 37 39 39 24 22LMPC 1500 50 43 47 48 45 46 36 30

2000 52 49 59 55 52 54 49 40

1000 45 37 34 35 36 36 22 20LLPC 1500 46 41 40 39 41 44 30 29

2000 47 44 48 47 48 53 45 39


Face area (sq. ft.) 0.5 1 2 4 6 8 16 32 64 128


-9 -6 -3 0 2 3 6 9 12 15

Elbow Attenuators

EHPEMPELPSELF-NOISE POWER LEVELSSOUND ATTENUATOR INSTALLATION INSTRUCTIONS


Elbow Attenuators

Elbow attenuators are available in three models for horizontal or verticalapplications requiring broad band noise reduction when space for straightattenuators is not available. Performance data is provided for eight centerlinelengths - 36”, 48”, 60”, 72”, 84”, 96”, 108”, and 120”. Special centerlinelengths are available, upon request.

Do not use Elbow Attenuators when space permits the use of straightrectangular units. Follow the same location guidelines as rectangularattenuators.

Model EHP is a standard pressure drop unit ideally suited for systemvelocities at 500 to 1,000 fpm.

Model EMP also provides excellent attenuation values along with a moderatepressure drop at velocities from 1,000 to 1,500 fpm.

Model ELP offers the lowest pressure drop forvelocities above 1,500 fpm.

Special features of our Elbow Attenuators are:

• Bellmouth entrance to help minimize turbulence





• Optional polyethylene, Mylar or fiberglass cloth liners.


• Flamespread 10


Components are also available in stainless steel oraluminum construction.

Acoustical performance ratings are based onindependent tests of a 24” x 24” attenuator conducted by Intertek TestingServices, following general guidelines prescribed byASTM E477-96 and pending guidelines being developed specificallyfor Elbow Attenuators. Copies of the test reports are available upon request.

Elbow Attenuator - Model EHPDynamic Insertion Loss (dB)



PressDrop

163

2125

3250

4500

51K

62K

74K

88K

Reverse -1000 0.55 12 16 20 23 26 22 21 20Flow -500 0.13 11 15 18 22 35 22 21 20

EHP-36 0 0 10 14 17 22 24 23 21 20Forward 500 0.13 9 14 16 21 24 23 22 20

Flow 1000 0.55 8 13 16 21 23 24 23 21Reverse -1000 0.56 14 18 23 29 32 28 25 22

Flow -500 0.14 12 17 22 29 31 29 26 23EHP-48 0 0 11 16 21 29 31 29 27 24

Forward 500 0.14 10 16 21 28 32 30 28 24Flow 1000 0.56 8 15 21 27 33 32 30 24

Reverse -1000 0.57 15 19 26 35 38 34 27 21Flow -500 0.14 14 18 26 36 37 35 29 24

EHP-60 0 0 12 18 26 36 37 35 29 24Forward 500 0.14 11 17 25 35 37 36 30 25

Flow 1000 0.57 10 17 25 34 38 37 32 26Reverse -1000 0.58 17 20 29 42 44 39 29 21

Flow -500 0.14 15 20 30 42 44 40 30 23EHP-72 0 0 13 21 31 43 44 41 32 25

Forward 500 0.14 13 20 29 42 45 41 33 26Flow 1000 0.58 12 20 28 41 45 42 34 27

Reverse -1000 0.59 17 25 33 46 47 42 31 24Flow -500 0.14 15 25 33 46 47 43 32 25

EHP-84 0 0 13 26 34 47 47 44 34 26Forward 500 0.14 13 25 33 46 47 44 35 27

Flow 1000 0.59 12 25 32 45 48 45 36 28

Model number indicates centerline length of unit in inches.




1000




Elbow Attenuator - Model EMPDynamic Insertion Loss (dB)



PressDrop

163

2125

3250

4500

51K

62K

74K

88K

Reverse -1500 0.42 8 15 19 21 22 18 17 14Flow -1000 0.19 9 14 18 21 22 19 18 14

EMP-36 0 0 8 14 17 20 22 19 18 14Forward 1000 0.19 8 13 17 20 23 21 17 15

Flow 1500 0.42 7 13 17 19 23 21 17 15Reverse -1500 0.45 8 16 21 27 28 25 23 16

Flow -1000 0.20 9 15 20 26 27 24 22 16EMP-48 0 0 8 15 19 25 27 24 23 16

Forward 1000 0.20 8 12 19 25 28 26 23 17Flow 1500 0.45 7 13 19 26 28 26 24 18

Reverse -1500 0.49 11 15 23 30 32 28 25 18Flow -1000 0.22 11 16 22 31 32 29 25 18

EMP-60 0 0 9 16 21 30 32 29 26 18Forward 1000 0.22 9 14 21 30 33 30 27 18

Flow 1500 0.49 8 14 20 29 32 29 28 19Reverse -1500 0.51 13 16 26 35 36 33 28 23

Flow -1000 0.23 13 17 25 36 37 34 28 23EMP-72 0 0 10 18 24 35 36 34 28 22

Forward 1000 0.23 10 17 24 35 36 34 28 24Flow 1500 0.51 10 17 23 34 35 33 30 25

Reverse -1500 0.54 13 19 32 39 38 35 28 23Flow -1000 0.24 14 20 32 40 40 37 29 24

EMP-84 0 0 11 21 31 39 39 37 29 23Forward 1000 0.24 11 20 31 39 39 38 30 24

Flow 1500 0.54 10 20 30 38 38 36 30 25



Pressure Drop Calculation for Specific VelocityActual Velocity (fpm) = CFM x 144 [Height (in.) x Width (in.)]

Pressure Drop = Actual Velocity1500




Elbow Attenuator - Model ELPDynamic Insertion Loss (dB)



PressDrop

163

2125

3250

4500

51K

62K

74K

88K

Reverse -2000 0.24 9 10 13 16 18 20 18 12Flow -1500 0.13 9 10 12 15 18 19 18 12

ELP-36 0 0 7 9 12 15 18 18 17 12Forward 1500 0.13 6 9 13 14 19 19 19 11

Flow 2000 0.24 6 8 12 14 18 19 19 11Reverse -2000 0.28 9 11 14 19 21 22 19 12

Flow -1500 0.15 9 11 15 20 21 22 19 13ELP-48 0 0 8 10 14 20 21 22 20 13

Forward 1500 0.15 8 10 15 19 23 23 21 15Flow 2000 0.28 7 9 14 19 23 23 21 15

Reverse -2000 0.32 10 11 16 22 22 23 19 14Flow -1500 0.18 9 10 16 23 23 23 19 14

ELP-60 0 0 9 10 15 23 23 24 21 15Forward 1500 0.18 8 9 15 21 24 25 21 16

Flow 2000 0.32 8 9 15 21 24 25 21 16Reverse -2000 0.36 11 12 17 22 24 24 20 15

Flow -1500 0.20 10 11 16 23 24 25 20 15ELP-72 0 0 9 10 15 24 24 25 22 16

Forward 1500 0.20 9 10 15 23 26 26 23 18Flow 2000 0.36 8 11 16 23 26 26 23 19

Reverse -2000 0.40 12 14 18 24 28 27 23 17Flow -1500 0.22 11 14 18 26 27 28 23 17

ELP-84 0 0 10 13 17 26 27 28 25 18Forward 1500 0.22 10 12 16 26 29 29 27 20

Flow 2000 0.40 9 12 16 25 29 30 27 21





2000




Rectangular Elbow Attenuators




Model Velocityfpm

163

2125

3250

4500

51K

62K

74K

88K

750 55 41 37 36 43 45 39 33EHP 1000 60 50 42 38 45 53 50 44

1500 71 62 55 50 50 59 63 59750 54 40 35 36 42 39 32 29

EMP 1500 60 58 55 50 50 57 56 502000 72 62 57 56 58 62 64 591000 59 40 33 35 42 41 32 27

ELP 2000 68 57 52 49 51 58 59 532500 75 64 59 55 55 62 65 61

Area Correction Factors - Listed self-noise power levels are for silencers with a face area of four (4)square feet. For silencers with different face areas, the following values must be added to those in thetable.

Face area (sq. ft.) 0.5 1 2 4 6 8 16 32 64 128


-9 -6 -3 0 2 3 6 9 12 15

Packless Attenuator

PHPPMPPLPSELF-NOISE POWER LEVELSSOUND ATTENUATOR INSTALLATION INSTRUCTIONS


Airflow

Packless Attenuators

Packless attenuators contain no absorptive fill or media of any kind. Units areavailable in three models for traditional applications requiring broad bandnoise reduction. Performance data is provided for three basic lengths - 36”,72”, and 108”. Contact AeroSonics for other silencer lengths.

Model PHP is a standard pressure drop unit ideally suited for low velocitysystems.

Model PMP also provides excellent attenuation values along with a moderatepressure drop at somewhat higher air velocities.

Model PLP offers the lowest pressure drop for higher velocity systems.

Special features of our Standard Attenuators are:

• No acoustic fill, scrim cloth, or other media


• Tuned perforated resonant chambers toachieve broad-band attenuation



• Seams are mastic filled to insure airtight units to8” w.g.

Components are also available in stainless steel.


Packless Attenuator - Model PHPDynamic Insertion Loss (dB)



PressDrop

163

2125

3250

4500

51K

62K

74K

88K

Reverse -1000 0.44 8 11 16 23 13 11 8 8Flow -500 0.11 8 11 16 23 13 11 8 8

PHP-36 0 8 8 14 18 11 11 9 9Forward 500 0.11 7 8 17 22 13 11 9 9

Flow 1000 0.44 7 8 17 22 13 11 9 9

Reverse -1000 0.53 12 16 24 29 18 14 12 10Flow -500 0.13 12 16 24 29 18 14 12 10

PHP-72 0 0 8 10 17 24 16 13 12 10Forward 500 0.13 11 14 22 29 19 14 13 12

Flow 1000 0.53 11 14 22 29 19 14 13 12

Reverse -1000 0.64 16 24 29 35 24 18 15 11Flow -500 0.16 16 24 29 35 24 18 15 11

PHP-108 0 10 15 23 28 20 17 15 14Forward 500 0.16 13 20 30 33 24 18 15 14

Flow 1000 0.64 13 20 30 33 24 18 15 14


Pressure Drop Calculation for Specific Velocity

Pressure Drop = fpm 1000 @ Drop Pressure Catalog x 2

1000

VelocityActual

Standard Construction Optional Features22 gauge galvanized casings Stainless Steel Construction24 gauge perforated bafflesNo acoustic fill or absorptive material

Computer program available that provides attenuator performance at actual job conditions.

Packless Attenuator - Model PMPDynamic Insertion Loss (dB)



PressDrop

163

2125

3250

4500

51K

62K

74K

88K

Reverse -1000 0.36 5 6 9 16 21 14 9 9Flow -500 0.09 5 6 9 16 21 14 9 9

PMP-36 0 4 4 6 15 18 11 10 9Forward 500 0.09 5 5 9 16 20 13 10 8

Flow 1000 0.36 5 5 9 16 20 13 10 8

Reverse -1000 0.51 9 12 17 28 27 16 11 10Flow -500 .13 9 12 17 28 27 16 11 10

PMP-72 0 5 7 11 24 23 16 12 11Forward 500 0.13 6 8 15 25 25 16 12 12

Flow 1000 0.51 6 8 15 25 25 16 12 12

Reverse -1000 0.63 10 18 25 35 35 20 17 15Flow -500 .16 10 18 25 35 35 20 17 15

PMP-108 0 8 12 15 30 30 20 17 16Forward 500 0.16 8 15 21 33 32 21 18 17

Flow 1000 0.63 8 15 21 33 32 21 18 17




1000

VelocityActual

Standard Construction Optional Features22 gauge galvanized casings Stainless Steel Construction 24

gauge perforated bafflesNo acoustic fill or absorptive material


Packless Attenuator - Model PLPDynamic Insertion Loss (dB)



PressDrop

163

2125

3250

4500

51K

62K

74K

88K

Reverse -2000 0.61 7 8 15 13 9 8 7 6Flow -1000 0.15 6 6 14 12 8 7 7 6

PLP-36 0 5 4 10 9 8 7 6 5Forward 1000 0.15 6 5 13 10 8 7 6 6

Flow 2000 0.61 6 6 15 12 9 8 7 6

Reverse -2000 0.72 9 10 20 16 11 9 8 8Flow -1000 0.18 7 8 17 14 10 9 8 8

PLP-72 0 6 6 16 14 10 9 8 8Forward 1000 0.18 6 7 19 15 11 10 9 8

Flow 2000 0.72 7 8 21 17 12 11 9 8

Reverse -2000 0.84 13 15 27 18 14 11 10 8Flow -1000 0.21 11 12 22 17 13 11 10 8

PLP-108 0 9 10 19 16 12 11 10 8Forward 1000 0.21 10 10 24 18 14 12 10 8

Flow 2000 0.84 11 12 28 20 15 12 10 8




1000

VelocityActual

Standard Construction Optional Features22 gauge galvanized casings Stainless Steel Construction 24

gauge perforated bafflesNo acoustic fill or absorptive material


Rectangular Packless AttenuatorsNo Absorptive Fill Units




Model Velocityfpm

163

2125

3250

4500

51K

62K

74K

88K

500 56 49 43 43 49 54 47 28PHP 1000 64 58 51 51 55 65 63 54

1500 66 65 60 58 59 66 72 70

500 55 47 42 43 49 54 47 28PMP 1000 63 54 50 52 55 58 56 42

1500 63 59 57 59 61 65 68 61

500 50 46 41 41 48 53 45 25PLP 1000 53 49 47 46 52 53 46 31

1500 63 58 56 55 57 63 64 54


Face area (sq. ft.) 0.5 1 2 4 6 8 16 32 64 128


-9 -6 -3 0 2 3 6 9 12 15

Tubular Silencers

• Single Wall Attenuators• Double Wall Attenuators• Low Frequency Attenuators• Packless for Round Ductwork• Packless Silencers for Control Valves


Standard Tubular Attenuators

Models RA and RB are single wall units that

provide an economical solution to less severe

noise problems. Standard unit length is three timesthe diameter, minimum 48.”

Models DRA, DRB, and DRC provide improved

performance by adding a double wall casing. Unitwidth is diameter plus 6”. Standard unit length is two

times the diameter, minimum 36,” plus 2” long collar

on each end.

Special features of standard tubular attenuators

include:

• Radius spun inlet nose on center absorber to provide minimum pressure drop

• Available in one inch diameter increments from 10” - 22” and 2” diameterincrements from 24” - 60”.

• SMACNA galvanized steel gauges for RA and RB casings

• DR model casings:

• 12” - 24” diameter - 22 ga. galvanized steel




• Seams are roll formed and mastic filled to insure airtight units to 8” w.g.

• Optional polyethylene, Mylar or fiberglass cloth liners


• Flamespread 10



Acoustical performance ratings are based on tests conducted by Intertek TestingServices, formerly ETL Testing Laboratories, Inc., Cortland, New York, in accordance

with ASTM E477 “Standard Method of Testing Duct Liner Materials and Prefabricated

Silencers for Acoustical and Airflow Performance.” Copies of the test reports are

available upon request.

RA

DR

Single Wall Attenuators

RARBSELF-NOISE POWER LEVELS


Single Wall Tubular Attenuator - Models RA RBDynamic Insertion Loss (dB)



PressDrop

163

2125

3250

4500

51K

62K

74K

88K

Reverse -4000 0.73 8 12 18 22 20 14 11 10Flow -2000 0.19 8 11 17 21 18 14 11 11

RA 0 7 10 16 21 18 15 12 12Forward +2000 0.19 5 10 14 22 19 17 12 12

Flow +4000 0.73 4 8 13 21 19 17 12 13Reverse -4000 0.45 2 6 9 14 16 8 5 5

Flow -2000 0.12 2 5 9 13 14 8 6 5RB 0 1 4 8 12 12 9 6 7

Forward +2000 0.12 1 3 8 12 11 9 6 6Flow +4000 0.45 0 3 8 12 10 9 6 6



Actual Velocity (fpm) = CFM x 144 ÷ [3.14 x r² (in.)] r = radius


4000


Standard Construction Optional FeaturesSMACNA galvanized steel Mylar or polyethylene linersgauges for casings Fiberglass cloth liners24 gauge perforated baffles Stainless steel or aluminum constructionAcoustic quality Fiberglass media


Tubular Attenuators


Self-Noise Power Levels,

dB re 10 Watts-12


Model Velocityfpm

163

2125

3250

4500

51K

62K

74K

88K

RA 2000 59 57 51 47 47 45 42 334000 69 68 70 71 64 66 61 57

RB 2000 62 59 51 47 47 44 39 364000 68 67 59 55 57 55 49 52

DRA 2000 57 55 49 44 42 41 39 344000 72 69 67 69 57 61 64 60

DRB 2000 55 53 46 43 41 40 37 324000 69 65 64 65 52 57 59 56

DRC 2000 52 49 44 41 40 38 35 304000 65 62 62 63 49 51 53 51

LRA 2000 57 55 49 44 42 41 39 344000 72 69 67 69 57 61 64 60

LRB 2000 55 53 46 43 41 40 37 324000 69 65 64 65 52 57 59 56

LRC 2000 52 49 44 41 40 38 35 304000 65 62 62 63 49 51 53 51

RPS 2000 56 52 51 52 55 60 59 494000 59 61 60 58 60 64 68 66

RPL 2000 45 44 40 39 41 36 26 204000 57 57 55 54 55 58 57 48

REPL 2000 56 52 49 43 50 52 49 354000 68 67 63 60 62 65 68 64

Area Correction Factors - Listed self-noise power levels are for silencers with a face area of3.1 square feet. For silencers with different face areas, the following values must be added to those inthe table. Area correction values do not apply to models RPS, RPL, or REPL.

Face area (sq. ft.) 0.75 1.5 2.5 3.1 4 6 8 15PWL Correction

Factors, dB-6 -3 -1 0 1 3 4 7

Double Wall Attenuators

DRADRBDRCSELF-NOISE POWER LEVELS


Double Wall Tubular Attenuator

Models DRA DRB DRCDynamic Insertion Loss (dB)



PressDrop

163

2125

3250

4500

51K

62K

74K

88K

Reverse -4000 0.90 11 16 24 35 43 34 25 17Flow -2000 0.22 11 15 23 34 42 37 27 19

DRA 0 10 14 22 34 40 40 29 20Forward +2000 0.22 9 14 21 32 38 36 27 20

Flow +4000 0.90 6 13 21 30 33 32 25 20Reverse -4000 0.36 9 11 20 30 29 23 18 16

Flow -2000 0.10 9 10 19 28 28 23 18 16DRB 0 8 8 18 26 28 23 19 17

Forward +2000 0.10 7 8 17 26 26 21 19 16Flow +4000 0.36 7 8 15 24 25 19 18 15

Reverse -4000 0.32 5 9 14 28 27 23 17 14Flow -2000 0.08 4 8 13 26 26 23 18 15

DRC 0 4 8 12 25 26 23 19 16Forward +2000 0.08 4 7 12 23 25 21 18 16

Flow +4000 0.32 3 7 11 22 24 21 17 16





4000


Standard Construction Optional Features10” - 24” diameter - 22 ga. galv. Mylar or polyethylene liners26” - 60” diameter - 18 ga. galv. Fiberglass cloth liners24 gauge perforated baffles Stainless steel or aluminum constructionAcoustic quality Fiberglass media


Tubular Attenuators



dB re 10 Watts-12


Model Velocityfpm

163

2125

3250

4500

51K

62K

74K

88K

RA 2000 59 57 51 47 47 45 42 334000 69 68 70 71 64 66 61 57

RB 2000 62 59 51 47 47 44 39 364000 68 67 59 55 57 55 49 52

DRA 2000 57 55 49 44 42 41 39 344000 72 69 67 69 57 61 64 60

DRB 2000 55 53 46 43 41 40 37 324000 69 65 64 65 52 57 59 56

DRC 2000 52 49 44 41 40 38 35 304000 65 62 62 63 49 51 53 51

LRA 2000 57 55 49 44 42 41 39 344000 72 69 67 69 57 61 64 60

LRB 2000 55 53 46 43 41 40 37 324000 69 65 64 65 52 57 59 56

LRC 2000 52 49 44 41 40 38 35 304000 65 62 62 63 49 51 53 51

RPS 2000 56 52 51 52 55 60 59 494000 59 61 60 58 60 64 68 66

RPL 2000 45 44 40 39 41 36 26 204000 57 57 55 54 55 58 57 48

REPL 2000 56 52 49 43 50 52 49 354000 68 67 63 60 62 65 68 64



Factors, dB-6 -3 -1 0 1 3 4 7


LRALRBLRCSELF-NOISE POWER LEVELS


Low Frequency Tubular Attenuators

Models LRA, LRB, and LRC provide improved LOW FREQUENCY performanceto solve the toughest noiseproblems. Unit width is diameterplus 16”. Standard unit length is twotimes the diameter, minimum 36,”plus 2” long collars on each end.

Special features of the LOW FREQUENCY tubular attenuators include:

• Radius spun inlet note on centerabsorber to provide minimum pressure drop

• Available in one inch diameter increments from 10” - 22” and 2” diameterincrements from 24” - 60”.

• LR model casings:





• Seams are roll formed and mastic filled to insure airtight units to 8” w.g.

• Optional polyethylene, Mylar or fiberglass cloth liners


• Flamespread 10


Components also available in stainless steel or aluminum construction.


Low FrequencyDouble Wall Tubular Attenuator

Models LRA LRB LRCDynamic Insertion Loss (Db)



PressDrop

163

2125

3250

4500

51K

62K

74K

88K

Reverse -3000 0.45 14 18 28 36 41 32 22 20Flow -1500 0.11 13 18 27 35 42 35 23 21

LRA 0 11 16 26 34 41 35 23 21Forward +1500 0.11 10 15 25 32 40 35 24 21

Flow +3000 0.45 9 14 23 30 38 36 24 20Reverse -3000 0.19 12 14 25 30 36 26 19 16

Flow -1500 0.05 11 14 24 30 37 28 20 16LRB 0 10 12 23 29 37 29 20 17

Forward +1500 0.05 9 12 22 28 36 29 21 16Flow +3000 0.19 8 11 20 26 34 30 21 15

Reverse -3000 0.17 9 12 22 27 32 21 17 14Flow -1500 0.04 9 11 21 27 32 22 18 15

LRC 0 8 11 21 26 34 24 20 16Forward +1500 0.04 7 11 20 25 32 24 20 16

Flow +3000 0.17 7 10 19 24 30 22 20 14





3000


Standard Construction Optional Features10” - 24” diameter - 22 ga. galv. Mylar or polyethylene liners26” - 60” diameter - 18 ga. galv. Fiberglass cloth liners24 gauge perforated baffles Stainless steel or aluminum constructionAcoustic quality Fiberglass media


Tubular Attenuators



dB re 10 Watts-12


Model Velocityfpm

163

2125

3250

4500

51K

62K

74K

88K

RA 2000 59 57 51 47 47 45 42 334000 69 68 70 71 64 66 61 57

RB 2000 62 59 51 47 47 44 39 364000 68 67 59 55 57 55 49 52

DRA 2000 57 55 49 44 42 41 39 344000 72 69 67 69 57 61 64 60

DRB 2000 55 53 46 43 41 40 37 324000 69 65 64 65 52 57 59 56

DRC 2000 52 49 44 41 40 38 35 304000 65 62 62 63 49 51 53 51

LRA 2000 57 55 49 44 42 41 39 344000 72 69 67 69 57 61 64 60

LRB 2000 55 53 46 43 41 40 37 324000 69 65 64 65 52 57 59 56

LRC 2000 52 49 44 41 40 38 35 304000 65 62 62 63 49 51 53 51

RPS 2000 56 52 51 52 55 60 59 494000 59 61 60 58 60 64 68 66

RPL 2000 45 44 40 39 41 36 26 204000 57 57 55 54 55 58 57 48

REPL 2000 56 52 49 43 50 52 49 354000 68 67 63 60 62 65 68 64



Factors, dB-6 -3 -1 0 1 3 4 7

Packless for Round Ductwork

RPSRPLREPLSELF-NOISE POWER LEVELS


Packless Silencers for Round Ductwork

These in-line tubular packless (no acoustic fill) attenuators are available in twomodels for special applications requiring broad band noise reduction.Performance data is provided for three basic diameters – 8”, 12”, and 16”

Model RPS provides excellent attenuation values with a moderate pressuredrop for system velocities at or near 1000 fpm.

Model RPL is a low-pressure drop unit ideally suited for higher velocities at ornear 2,000 fpm.

Special features of the Packless Fume Hood Attenuators are:

• No acoustic fill or other sound absorptive material


• 24 gauge perforated galvanized baffle


• 21” x 21” casing on 8” and 12” diameter units.30” x 30” casing on 16” diameter units.

Components also available in stainless steel


Packless Silencer for Round Ductwork

Model RPSDynamic Insertion Loss (dB)



PressDrop

163

2125

3250

4500

51K

62K

74K

88K

Reverse -2000 0.39 16 19 26 17 11 12 12 8Flow -1000 0.10 16 18 25 18 11 11 11 8

RPS-8 0 16 18 25 18 12 11 11 8Forward 1000 0.10 16 18 25 18 11 11 11 7

Flow 2000 0.39 15 18 25 18 11 11 11 7Reverse -2000 0.48 10 13 19 22 18 11 8 7

Flow -1000 0.12 10 12 19 20 16 10 8 8RPS-12 0 9 11 16 19 14 9 9 8

Forward 1000 0.12 9 11 17 21 14 10 10 9Flow 2000 0.48 9 12 18 23 16 11 10 9

Reverse -2000 0.51 9 13 19 23 18 12 9 9Flow -1000 0.13 8 12 19 22 17 12 9 8

RPS-16 0 8 12 18 21 15 11 9 8Forward 1000 0.13 7 12 17 21 15 11 9 8

Flow 2000 0.51 7 11 19 22 15 12 10 7





2000


Standard Construction Optional Features22 gauge galvanized casings Stainless Steel Construction24 gauge perforated bafflesNo acoustic fill or absorptive materialCasing: 8” & 12” = 21” x 21”

16” = 30” x 30”Length = 36”



Model RPLDynamic Insertion Loss (dB)



PressDrop

163

2125

3250

4500

51K

62K

74K

88K

Reverse -2000 0.04 14 16 25 16 8 7 6 4Flow -1000 0.01 14 15 24 17 8 6 6 4

RPL-8 0 14 15 24 17 9 6 6 4Forward 1000 0.01 14 15 24 18 8 6 6 3

Flow 2000 0.04 13 15 24 18 8 6 4 2Reverse -2000 0.04 7 9 16 19 7 7 5 4

Flow -1000 0.01 7 8 15 19 8 6 5 4RPL-12 0 7 8 15 19 8 6 5 4

Forward 1000 0.01 7 8 15 20 7 6 4 3Flow 2000 0.04 6 8 15 20 7 6 4 2

Reverse -2000 0.04 7 9 16 19 7 7 5 4Flow -1000 0.01 7 8 16 19 8 6 5 4

RPL-14 0 6 8 15 19 8 6 5 4Forward 1000 0.01 6 7 15 20 7 6 4 3

Flow 2000 0.04 6 7 15 20 7 6 4 2Reverse -2000 0.04 6 9 17 18 7 7 6 6

Flow -1000 0.01 5 8 17 18 8 8 6 5RPL-16 0 5 7 16 19 9 8 6 5

Forward 1000 0.01 5 7 16 19 8 7 5 4Flow 2000 0.04 5 6 16 20 8 7 4 3





2000



16” = 30” x 30”Length = 36”


Packless Silencers for Round DuctworkElbow Type

These elbow type tubular packless (no acoustic fill) attenuators are availablefor special applications requiring broad band noise reduction. Performancedata is provided for three basic diameters – 8”, 12”, and 16”

Model REPL is a low-pressure drop unit ideally suited for all applications


• No acoustic fill or other sound absorptive material


• 24 gauge perforated galvanized baffle


• 21” x 21” casing on 8” and 12” diameter units.30” x 30” casing on 16” diameter units.




Elbow Type - Model REPLDynamic Insertion Loss (dB)



PressDrop

163

2125

3250

4500

51K

62K

74K

88K

Reverse -2000 0.19 11 15 28 23 18 14 12 10Flow -1000 0.05 10 14 26 19 14 12 11 10

REPL-8 0 10 14 26 18 14 12 10 10Forward 1000 0.05 10 14 26 19 14 13 10 9

Flow 2000 0.19 11 13 25 19 19 14 11 9Reverse -2000 0.19 8 9 23 23 16 11 9 6

Flow -1000 0.05 7 8 20 19 12 9 8 5REPL-12 0 6 7 20 19 12 10 7 6

Forward 1000 0.05 6 6 19 19 12 10 7 6Flow 2000 0.19 6 7 19 22 17 12 8 5

Reverse -2000 0.19 9 11 19 13 13 8 4 3Flow -1000 0.05 7 9 16 12 11 8 5 4

REPL-16 0 6 8 14 10 9 8 6 5Forward 1000 0.05 7 10 16 11 11 9 7 5

Flow 2000 0.19 8 11 17 13 12 9 7 6





2000



16” = 30” x 30”


Tubular Attenuators



dB re 10 Watts-12


Model Velocityfpm

163

2125

3250

4500

51K

62K

74K

88K

RA 2000 59 57 51 47 47 45 42 334000 69 68 70 71 64 66 61 57

RB 2000 62 59 51 47 47 44 39 364000 68 67 59 55 57 55 49 52

DRA 2000 57 55 49 44 42 41 39 344000 72 69 67 69 57 61 64 60

DRB 2000 55 53 46 43 41 40 37 324000 69 65 64 65 52 57 59 56

DRC 2000 52 49 44 41 40 38 35 304000 65 62 62 63 49 51 53 51

LRA 2000 57 55 49 44 42 41 39 344000 72 69 67 69 57 61 64 60

LRB 2000 55 53 46 43 41 40 37 324000 69 65 64 65 52 57 59 56

LRC 2000 52 49 44 41 40 38 35 304000 65 62 62 63 49 51 53 51

RPS 2000 56 52 51 52 55 60 59 494000 59 61 60 58 60 64 68 66

RPL 2000 45 44 40 39 41 36 26 204000 57 57 55 54 55 58 57 48

REPL 2000 56 52 49 43 50 52 49 354000 68 67 63 60 62 65 68 64



Factors, dB-6 -3 -1 0 1 3 4 7

Packless Silencers for Control Valves

CVS-5/6CVS-7/8CVS-9/10CVS-11/12


Packless Silencers for Control Valves

This in-line tubular packless (no acoustic fill) attenuator is specificallydesigned to be used with exhaust and supply control valves. The CVS has alow profile casing for limited space installations. Performance data isprovided for seven diameters – 5”, 6”, 7”, 8”, 9”, 10” and 12”

Model CVS is a low-pressure drop unit ideally suited for higher velocities at ornear 2,000 fpm.

Low profile outer casing dimensionsModel B x BCVS-5/CVS-6: 15” x 15”CVS-7/CVS-8: 17” x 17”CVS-9/CVS-10: 19” x 19”CVS-11/CVS-12: 21” x 21”


• No acoustic fill or other sound absorptive material• 22 gauge galvanized steel casings• 24 gauge perforated galvanized baffle• Seams are mastic filled to insure airtight

units to 8” w.g.



Packless Silencer for Control Valves

Model CVS-5/CVS-6Dynamic Insertion Loss (dB)


Length Flow Velocityfpm

PressDrop

163

2125

3250

4500

51K

62K

74K

88K

Reverse -2000 0.049 5 11 16 15 9 7 8 6Flow -1000 0.012 5 10 13 14 8 7 8 6

36” 0 4 10 13 14 8 7 8 6Forward 1000 0.012 5 11 13 14 8 7 8 6

Flow 2000 0.049 5 11 15 15 8 7 8 5Reverse -2000 0.050 6 12 19 18 10 8 9 7

Flow -1000 0.014 6 11 16 17 9 8 9 748” 0 5 11 16 17 9 8 9 7

Forward 1000 0.014 6 12 16 17 9 8 9 7Flow 2000 0.050 6 12 18 17 9 8 9 6

Reverse -2000 0.052 7 13 22 21 11 9 10 8Flow -1000 0.015 7 12 19 20 10 9 10 8

60” 0 6 12 19 20 10 9 10 8Forward 1000 0.015 7 13 19 20 10 9 10 8

Flow 2000 0.052 7 13 21 20 10 9 10 7Reverse -2000 0.056 8 14 24 24 12 10 11 9

Flow -1000 0.017 8 13 22 23 11 10 11 972” 0 7 13 22 23 11 10 11 9

Forward 1000 0.017 8 14 22 23 11 10 11 9Flow 2000 0.056 8 14 22 23 11 10 11 8





2000


Standard Construction Optional Features22 gauge galvanized casings Stainless Steel Construction24 gauge perforated bafflesNo acoustic fill or absorptive materialCasing: 15” x 15”






PressDrop

163

2125

3250

4500

51K

62K

74K

88K

Reverse -2000 0.045 8 9 14 15 6 6 7 6Flow -1000 0.011 9 8 12 14 5 7 7 5

36” 0 8 7 12 14 5 6 7 5Forward 1000 0.011 9 8 12 14 5 6 7 5

Flow 2000 0.045 9 9 13 14 5 6 7 5Reverse -2000 0.048 9 10 17 19 7 7 8 7

Flow -1000 0.012 10 9 15 18 6 8 8 648” 0 9 8 15 18 6 7 8 6

Forward 1000 0.012 10 9 15 18 6 7 8 6Flow 2000 0.048 10 10 17 18 6 7 8 6

Reverse -2000 0.050 10 11 20 22 8 8 9 8Flow -1000 0.014 11 10 18 21 7 9 9 7

60” 0 10 9 18 21 7 8 9 7Forward 1000 0.014 11 10 18 21 7 8 9 7

Flow 2000 0.050 11 11 20 21 7 8 9 7Reverse -2000 0.054 11 12 23 25 9 9 10 9

Flow -1000 0.016 12 11 21 24 8 10 10 872” 0 11 10 21 24 8 9 10 8

Forward 1000 0.016 12 11 21 24 8 9 10 8Flow 2000 0.054 12 12 23 24 8 9 10 8





2000



Computer program available that provides attenuator performance at actual job conditions





PressDrop

163

2125

3250

4500

51K

62K

74K

88K

Reverse -2000 0.028 9 8 12 20 8 5 6 4Flow -1000 0.008 8 7 10 20 8 5 6 4

36” 0 6 6 9 20 8 5 7 4Forward 1000 0.008 7 7 9 20 8 5 7 3

Flow 2000 0.028 7 8 11 20 9 6 7 3Reverse -2000 0.030 10 9 13 23 9 6 7 5

Flow -1000 0.010 9 8 11 23 9 6 7 548” 0 7 7 10 23 9 6 8 5

Forward 1000 0.010 8 8 10 23 9 6 8 4Flow 2000 0.030 8 9 12 23 10 7 8 4

Reverse -2000 0.040 11 10 14 26 10 7 8 6Flow -1000 0.020 10 9 12 26 10 7 8 6

60” 0 8 8 11 26 10 7 9 6Forward 1000 0.020 9 9 11 26 10 7 9 5

Flow 2000 0.040 9 10 13 26 11 8 9 5Reverse -2000 0.060 12 11 15 30 11 8 9 7

Flow -1000 0.030 11 10 13 30 11 8 9 772” 0 9 9 12 30 11 8 10 7

Forward 1000 0.030 10 10 12 30 11 8 10 6Flow 2000 0.060 10 11 14 30 12 9 10 6





2000








PressDrop

163

2125

3250

4500

51K

62K

74K

88K

Reverse -2000 0.040 7 9 16 19 7 7 5 4Flow -1000 0.010 7 8 15 19 8 6 5 4

36” 0 7 8 15 19 8 6 5 4Forward 1000 0.010 7 8 15 20 7 6 4 3

Flow 2000 0.040 6 8 15 20 7 6 4 2Reverse -2000 0.030 8 10 18 21 8 8 6 6

Flow -1000 0.010 8 9 16 21 8 8 6 648” 0 8 9 16 20 8 8 6 6

Forward 1000 0.010 8 9 16 20 8 8 7 5Flow 2000 0.030 7 9 16 20 8 8 6

Reverse -2000 0.040 10 11 19 23 10 10 8 8Flow -1000 0.020 10 11 18 23 9 10 8 8

60” 0 9 10 18 22 9 9 8 8Forward 1000 0.020 9 10 17 22 8 9 8 8

Flow 2000 0.040 9 10 17 22 8 9 8 8Reverse -2000 0.060 12 12 21 25 12 11 9 8

Flow -1000 0.030 12 12 21 24 11 11 9 872” 0 12 12 20 24 11 11 9 8

Forward 1000 0.030 12 12 20 24 10 11 9 8Flow 2000 0.060 12 12 20 23 10 11 9 8





2000




Acoustical Diffuser Cones for Vane Axial Fans

• Cone Diffusers


Cone Diffusers

CD


Cone Diffusers for Vane Axial Fans

The AeroSonics Cone Diffuser is specifically engineered for silencing vaneaxial fans. The diameter of each Cone Diffuser is precisely matched to themanufacturer’s fan size.

L

A1 A2

2

F

FAIR FLOW >>>>>>

2

Special features of the Cone Diffuser include:

• Reduced turbulence with center pod sized to match axial fan hub• Inlet diameter specifically dimensioned to fan manufacturer’s size• 18 gauge galvanized casings - 22 gauge perforated cone and center pod• Long strand Fiberglass acoustic fill• Seams are mastic filled to insure airtight units to 8” w.g.• Optional polyethylene, Mylar or fiberglass cloth liner


• Flamespread 10



Cone Diffuser for Vane Axial Fans - Model CDDynamic Insertion Loss (dB)

Diameter Casing Octave Band/Center Frequency (Hz)Model A1

(in.)A2

(in.)F

(in.)L

(in.)Lbs. 1

632

1253

2504

5005

1K6

2K7

4K8

8K

CD 23 ¼ 23 ¼ 30 34 28 148 3 5 12 19 23 19 16 14CD 25 ¼ 25 ¼ 32 36 28 155 3 5 12 19 23 19 15 13CD 27 ¼ 27 ¼ 34 38 28 165 3 6 12 18 22 18 15 13CD 29 ¼ 29 ¼ 36 40 28 175 3 6 13 18 21 17 14 13CD 32 32 40 44 32 218 4 7 13 18 21 16 14 12CD 34 34 42 46 32 236 4 7 14 18 20 16 12 12CD 36 36 46 50 40 277 4 8 14 18 18 15 12 11CD 38 38 48 52 40 328 4 10 15 17 16 14 11 11CD 42 ½ 42 ½ 52 56 40 374 4 11 16 17 15 12 10 10CD 45 45 56 60 44 480 5 11 16 17 14 12 10 10CD 48 48 60 64 46 540 5 12 16 17 14 12 10 10CD 54 54 68 72 54 621 5 12 16 17 14 11 10 10CD 60 60 74 78 54 702 5 12 17 17 13 11 10 10CD 66 66 82 86 60 1150 5 13 17 17 13 10 10 10CD 72 72 90 94 72 1400 5 13 17 17 13 10 10 10

L

A1 A2

2

F

FAIR FLOW >>>>>>

2

Standard Construction Optional Features18 gauge galvanized casings Stainless steel or aluminum construction22 gauge perforated baffles Polyethylene or Mylar LinerLong strand Fiberglass acoustic fill Fiberglass cloth liner

Transfer Silencers - Grille Silencers

• Transfer• Grille


Transfer

LZTCS


Transfer Silencers

The Transfer Silencer is designed to allow air to circulate freely while blockingspeech and disturbing noises. Typical installations are in ceiling spaces overpartitions separating occupied areas.

Special features of the Transfer Silencer include:

• 22 gauge galvanized casings• 24 gauge perforated baffle• Long strand Fiberglass acoustic fill• Seams are mastic filled to insure airtight units to 8” w.g.• Optional polyethylene, Mylar or fiberglass cloth liner


• Flamespread 10



Type “U" Type “L” Type “Z”

Type “S”

Type “TC”

Transfer Silencers

ACOUSTICAL PERFORMANCE

OCTAVE BAND 1 2 3 4 5 6 7 8

FREQUENCY (Hz) 63 125 250 500 1000 2000 4000 8000

NOISE REDUCTION ( dB ) - Models U, L, Z 22 30 33 37 47 49 49 43

NOISE REDUCTION (dB) - Model TC 16 21 25 32 40 44 42 40

STATIC PRESSURE DROP (PD)

.05 .10 .15 .20 .25

Model Type Air Flow (CFM)

114 U, L, Z 125 190 240 250 280

130 “ 260 400 490 560 590

142 “ 320 510 650 750 780

214 “ 180 260 320 370 400

230 “ 380 560 680 780 810

242 “ 530 760 950 1100 1140

314 “ 250 370 450 520 550

342 “ 740 1050 1400 1600 1680

TC22 TC 380 500 640 740 780

TC12 TC 190 260 330 360 390

Transfer Silencers - Dimensional CharacteristicsModel W T O Length (inches) Weight

TC L U & Z S114 14 3 ½ 6 42 48 30130 30 3 ½ 6 42 48 63142 42 3 ½ 6 42 48 85214 14 5 8 40 48 32230 30 5 8 40 48 68242 42 5 8 40 48 93314 14 7 10 38 48 38330 30 7 10 38 48 80342 42 7 10 38 48 105S6 6 7 6 13 13S8 8 7 6 19 15

TC-12 10 ½ 7 8 22 ½ 29TC-22 22 ½ 7 8 22 ½ 33

Grille

GS


Grille Silencers

The Grille Silencer is used when space is minimal. Only 4” deep, the Grille Silencer providessuperior noise reduction at return air grilles.

Special features of the Grille Silencerinclude:

• 22 gauge galvanized casings• 24 gauge perforated baffle• Long strand Fiberglass acoustic fill• Optional polyethylene, Mylar orfiberglass cloth liner


• Flamespread 10



Acoustical PerformanceOctave Band 1 2 3 4 5 6 7 8

Center Freq. (Hz) 63 125 250 500 1K 2K 4K 8K

Noise Reduction(dB)

6 13 14 19 27 27 20 16

Face Velocity (fpm) 220 310 400 450 550

Pressure Drop (WG) 0.06 0.11 0.17 0.22 0.30

Acoustical Louvers

• Acoustical Louvers


Acoustical Louvers

AL-12AL-8


Acoustical Louvers

12” or 8” deep Acoustical Louvers provide exceptional sound control at outside air intake orexhaust openings. Fan and equipment noise remains in the mechanical space.

Special features of the Acoustical Louver include:

• 18 gauge galvanized casings• 22 gauge perforated baffle• Long strand Fiberglass acoustic fill• Optional flange and birdscreen available• Painted exterior available


• Flamespread 10


Components also available in stainless steel or aluminumconstruction.

Acoustical PerformanceOctave Band 1 2 3 4 5 6 7 8

Center Frequency, Hz 63 125 250 500 1K 2K 4K 8K

12” Deep - Noise Reduction, dB 10 12 15 17 19 18 18 148” Deep - Noise Reduction, dB 9 11 12 15 17 16 16 11

12” Deep - Transmission Loss, dB 4 6 9 11 13 12 12 88” Deep - Transmission Loss, dB 4 5 6 9 11 10 10 7

Static Pressure LossFace Velocity, fpm 250 350 500 750 1000 1100

12” Deep Pressure Drop 0.04 0.06 0.15 0.35 0.60 0.758” Deep Pressure Drop 0.04 0.06 0.15 0.35 0.60 0.75

Acoustical/Thermal Enclosures

• Acoustical/Thermal Enclosures



Enclosure Specs



Acoustical/Thermal Enclosures for Fan Housings, Air Intake or Exhaust, and other similar plenums areeasily field erected using the AeroSonics double wall acoustical panel system. Structural strength, easeof installation, and excellent sound absorption qualities make for a highly effective acoustical enclosure.Performance ratings are derived from Independent certified test reports for transmission loss and soundabsorption coefficients.

4” & 2” panel construction features:

• 18 gauge galvanized exterior panel skins• 22 gauge solid or perforated interior panel skins• Optional gauge available up to 16 gauge• 4# density mineral wool fill• Septum panel construction available• 18 gauge galvanized internal stiffeners 16” o.c.• Stainless steel or aluminum construction available• Access doors with optional view window• All trim, screws, caulking, and complete assembly drawings provided


• Flamespread 15


4” Panel - Acoustical PerformanceOctave Band 2 3 4 5 6 7 8

Center Frequency, Hz 125 250 500 1K 2K 4K 8K

Transmission Loss, dB 26 30.5 41 49.5 57.5 63 --Sound Absorption 0.76 1.41 1.32 1.15 1.11 1.00 --

STC Class = 40 Noise Reduction Coefficient 0.95

Heat Transfer factor: “U” = 0.07BTU/hr./sq.ft./deg F

The enclosure shall be self-supporting and able to withstand a differential pressure of 10” w.g. The panel shallnot deflect more than L/240 of the longest span.

*

FC

*

AC

1T-1

OC-1OC-2

HJ(12"OC., TYP.)

= H-JOINER

ABBREVIATION & SYMBOLS:

= FLOOR CHANNEL

= 2"x 6" TRIM ANGLE= 2"x 4" TRIM ANGLE= 2"x 2" TRIM ANGLE= 12x1 MECHANICAL FASTENERS= ANCHORS/FASTENERS BY OTHERS= CAULK SEALANT TO BE APPLIED

SHEET NO.

LEGEND

DETAIL NO.

ELEVATION NO.SHEET NO.

ELEVATIONS

SEPTUM (1S)

18 GAUGE GALV. INTERIOR AND EXTERIOR SHEET22 GAUGE GALV. CENTER SHEET18 GAUGE GALV. FRAMES AND STIFFENERS4 PCF MINERAL WOOL FILL18 GAUGE GALV. TRIM AND ACCESSORIES

--

1.063

1.1549.5

1.3241 57.5

1.11

18 GAUGE GALVANIZEDEXTERIOR SHEETING

22 GAUGE GALVANIZEDSOLID INTERIOR SHEETING

(1C)

STANDARD PANEL (1A) OR (2A)

18 GAUGE GALV. EXTERIOR SHEET22 GAUGE GALV. INTERIOR SHEET18 GAUGE GALV. FRAMES AND STIFFENERS4 PCF MINERAL WOOL FILL18 GAUGE GALV. TRIM AND ACCESSORIES

THERMAL PANEL (1C) OR (2C)

18 GAUGE GALV. EXTERIOR SHEET22 GAUGE GALV. INTERIOR SHEET18 GAUGE GALV. FRAMES AND STIFFENERS4 PCF MINERAL WOOL FILL18 GAUGE GALV. TRIM AND ACCESSORIES

DIRECTION OF ERECTION

OTHERWISE INDICATED ONIS LEFT TO RIGHT UNLESS

NO SCALE2NO SCALETYPICAL PANEL DETAILS

= 1"-1.5# x 6"W FILLER INSULATION#

OR FLOORS.

AeroSonics # SYMBOL.

BY AeroSonics WHERE NEEDED.

AS REQUIRED BY MECHANICAL CONTRACTOR.

PERFORMANCE CHARACTERISTICS

WHERE SHOWN ON DRAWINGS, FURNISHED BY AeroSonics.A- NO. 12 X 1" LONG SHEET METAL SCREWS TO BE USED

FLAMESPREAD..........................15

SMOKE DEVELOPED..................5

1.41.7626

-- 30.5

FURNISHED BY AeroSonics.

UL-723 TEST METHODS:

TRANSMISSION LOSS (dB)SOUND ABSORPTION COEFF.

SOUND TRANSMISSION CLASS 40

FIRE RATINGS IN ACCORDANCE WITH ASTM E84, NFPA-255,

OCTAVE BAND 1 2 3 4 5 6 7 8

#

4 PCF MINERAL WOOLPANEL FILL

18 GAUGE GALVANIZEDFRAMES AND STIFFENERS

(16 OC, TYP.)

1TYPICAL JOINT DETAILS

*

NO. 12 X 1"MECHANICAL FASTENERS

GENERAL INSTALLATION INSTRUCTIONS AND

ALL TRIM AND FLOOR CHANNEL WILL BE 18 GA. GALVANIZED STEEL AND

SEALANT TO BE APPLIED TO BOTH SIDES OF PANEL AS INDICATED BY THE * SYMBOL,

STRUCTURAL STEEL AND SUPPORTING PIPE COLUMNS ALSO SUPPLIED

ACOUSTICAL PERFORMANCE: PANELS HAVE BEEN TESTED ACOUSTICALLY BYA NATIONALLY KNOWN QUALIFIED INDEPENDENT LABORATORY IN

WITH INSULATION (1"-1.5# FIBERGLASS, SLIT 6" WIDE) SUPPLIED BY

WILL BE SUPPLIED IN 10 FT. SECTIONS, TO BE CUT AND NOTCHED

CENTER FREQUENCY (Hz) 63 125 250 500 1K 2K 4K 8K

THERMAL PERFORMANCE: U FACTOR= 0.07 BTU/Hr./SQ.FT./DEG. F

ACCORDANCE WITH ASTM E90, E413, E423, AND E795.

WHERE PANELS ARE JOINED AND VOIDS ARE CREATED, FILL VOIDS

C- FASTENERS SUITABLE FOR ATTACHMENT INTO MASONRY WALL

ANGLED WALL TRIM

INTERIOR OF CASING

A

*

**

*

A

A1T-1

A

A

OPENING HEIGHT

#

OC-1 OR OC-2

*

A

#

*A

SPECIAL TRIM

OF THE WALL* AMATCHING ANGLE

A

*

3

A

SPECIAL TRIM

OF THE WALL

EXTERIOR OF CASING

MATCHING ANGLE

*

*

OC-1 OR OC-2

EXTERIOR OF CASING

INTERIOR TO EXTERIOR WALL CONNECTIONVIEWED FROM ABOVE PANEL

NO SCALE

4CORNER PANEL ASSEMBLY

1T-1

A*INT

ER

IOR

WA

LL

1T-1A *

NO SCALE

*A

#

NO SCALE

A

#

2.0"

#

2.0"

SEE ELEV.

5OPENINGSTRIMMING / FRAMING

SEE ELEV.

6NO SCALE

7

FINISHED FLOOROR CURB

VERTICAL WALL TO FLOOR

A0C-2

C*

1T-1

A*

0C-21T-1

#

A*

**WA

LL

EX

IST

ING

9

*C

A

*#

8" FLAT TRIM

FLOOR CHANNEL

*CHANNELFLOOR *

A

A

*A

1T-1

PANELROOF

NO SCALENO SCALENO SCALE8UPPER WALL, ROOF PANEL, LOWER WALL

*

#

*

NO SCALE

*

#

NO SCALE

*1T-1 C

10NO SCALE

SECTION VIEWROOF PANEL TO EXISTING STRUCTURE

*

A*

#

WA

LLU

PP

ER

A

*WA

LL

#

LO

WE

R

#

C

A

WA

LL

EX

IST

ING

C **

1T-1

VIEWED FROM ABOVE PANELWALL PANEL TO EXISTING STRUCTURE

(FC)

SEE ELEV.

REMOVABLET TRIM

A

A

**

AA

*

A

*

*

CLOSED-CELL

*

*

T TRIMAOPENING HEIGHT

A

NEOPRENE

GASKETCLOSED-CELL

12NO SCALENO SCALENO SCALE

ROOFPANEL

*T-JOINER

A

A

*

* 1T-1

*

REMOVABLE PANEL(FOR OVERALL WIDTH LARGER THAN 46")

NO SCALENO SCALENO SCALE

A

A

STRIP

ROOFPANEL

#

WA

LL*

A

4" FLASHING

*A

1T-1

14ATOP INTERIOR WALLT-JOINER, ROOF JOINT

INT

ER

IOR

A

NO SCALE

#

GASKET

A

11

NEOPRENE

REMOVABLE PANEL

##

PANEL

#

GASKET

A

NEOPRENE CLOSED-CELL

A

NO SCALENO SCALENO SCALE

#

#

**

GASKET

NEOPRENE CLOSED-CELL

A

FC

#

#

WA

LL

PA

NE

L

A

H-JOINER

13H-JOINER/ SIDE VIEW

A

A

RE

MO

VA

BL

EP

AN

EL

# #

OR

*

W.F. BEAM

GALV. H-JOINER

PANELSROOF

5"x 16#

IS USED, WELD

TYPE "A" IS USED, USE

FASTENERS

AT EACH STIFFENER.PANELS TO BEAM

WHEN W.F. BEAM

WHEN H-JOINER

*

15

3 1/2" SQUARE

(WHEN REQUIRED)

IN PLACE TO BEAMWELD TUBINGS

CARBON STEEL TUBINGS

& ANCHOR TO FLOOR

TRIM PIECE

DOOR HANDLE

CONTINUOUS"BUBBLE-RUBBER"

DOOR SEAL

A

INNER FACEPLATEWITH BACK STOP

RELEASELEVER

EXTERIOR (SMALL)

THREADED HANDLEROD

OUTER FACEPLATE

*A*

2" WIDE BACKINGTRIM PLATE

POLAR #412STAINLESS STEEL

HINGES(3)

TRIM PIECE

*

DOOR PULL

VENTLOK #310OR AMERLOC #30LATCH ASSEMBLY

(2)

HEIGHT

6"x 6"x 1/4"BASE PLATE

W/4 - 3/8"HOLES

NO SCALE

NOTE:

*COLUMNS TO ENSURE OF CASING. FIELD CUTTHAN THE I.D. HEIGHTSHIPPED 4" LONGER

PROPER LENGTH.

PIPE COLUMNS ARE

12" OC.

ROOFPANELS

*

W.F. BEAM/H-JOINER SUPPORT

INTERIORRELEASE

LEVER

SET SCREW

LOCK-NUT

17VENTLOK #310 LATCH ASSEMBLY

DOORBODY

NO SCALE

TYPICAL

SECTIONWALL

DOORBODY

NO SCALE

OPTIONAL12"x 10"

WINDOWVIEW

SAFETY GLASS

16

WIDTH

TYPICAL DOOR ARRANGEMENT

18

NO SCALE

PANEL

DOOR ASSEMBLY DETAILS

AeroSonics1601 Industrial Park DrCalifornia, MO 65018Phone: (573) 796-4151Fax: (573) 796-4153www.aerosonics.com

Air Louvers & Dampers1601 Industrial Park DrCalifornia, MO 65018Phone: (573) 796-4151Fax: (573) 796-4153www.aerosonics.com

Thermaflex528 Carwellyn RoadAbbeville, SC 29620Phone: (864) 366-5441Fax: (864) 366-8771www.thermaflex.net

TUTCO500 Gould DriveCookeville, TN 38506Phone: (931) 432-4141Fax: (931) 432-4140www.tutco.com

1601 Industrial Park DriveCalifornia, MO 65018Phone: (573) 796-4151Fax: (573) 796-4153www.aerosonics.com

FLEX-TEK GroupA Smiths Group North America Company

Sound Attenuators - Aerosonics Products

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