© Copyright Price Industries Limited 2011. All Metric dimensions ( ) are soft conversion. Imperial dimensions are converted to metric and rounded to the nearest millimeter.

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M-111

Models

Circular SilencersCircular Medium Velocity CMCircular High Velocity CHPRICE Absorptive Circular Silencersare designed to provide a practical solution for controlling duct noise in circular ductwork systems. A silencer that is the same shape and size as the ductwork eliminates the need for costly transitions, which produce turbulent air flow and increase the system pressure drop. Price circular silencers have a sleek internal geometry that is provided by locating the acoustic media outside of the air stream. The design ensures maximum acoustical performance while minimizing system pressure drops at duct velocities as high as 8000 fpm. Our available standard sizes offer excellent flexibility to ductwork designs, and because we do not limit our cataloged silencer offering to certain sizes, we have the ability to build each silencer to suit the ductwork and, in turn, the application.

Features• Eliminate costly square to round

transitions.

• Smooth aerodynamic internal geometries that minimize pressure drop and turbulence.

• Highest quality leak-free construction.

• Capable of velocities as high as 8000 fpm.

• 2 in. slip connection on both ends.

CM SilencersPrice CM silencers are designed for medium velocity applications. This medium velocity configuration provides high levels of insertion loss across the full range of frequencies, and the sleek curved inlet and outlet of the center pod reduce turbulence and allow for static regain for improved pressure drop. This configuration is best suited for applications with velocities of 4000 fpm or less.

CH SilencersPrice CH silencers are designed for high velocity applications and have no center pod in the air stream to constrict the air flow. This minimizes the pressure drop that can occur at higher velocities, while still providing high levels of insertion loss across the full range of frequencies. Price CH Silencers are best suited for applications where low pressure drops are the priority or high air velocities cannot be avoided.

Absorptive Circular SilencersCM,CH Series

Product Information

CM - Circular Medium Velocity

CH - Circular High Velocity

Recommended Air Velocity Ranges

Price recommends that silencers are selected within the following duct velocity ranges:

Model Description Air Velocity Range (fpm)

CM Medium Velocity Silencer 0-4000

CH High Velocity Silencer 0-8000

Product Information IndexPerformance Data ................M113-M122Suggested Specification ................M363

All Metric dimensions ( ) are soft conversion. © Copyright Price Industries Limited 2011. Imperial dimensions are converted to metric and rounded to the nearest millimeter.

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M-112

ConstructionPrice absorptive circular silencers consist of a metal casing, perforated metal liner, and acoustic fiberglass media. These silencers are available in various classifications to meet the specific requirements of each project.

CL1 – 22 gauge casing & 22 gauge perforated liner

CL2 – 18 gauge casing & 22 gauge perforated liner

CL3 – 16 gauge casing & 22 gauge perforated liner

For applications with very strict or unique requirements that cannot be met by the standard construction classifications, please contact your local Price sales rep.

SPLC – Special construction available upon request.

MaterialG – Galvanized (Default material)

A – Aluminum†

304 – 304 Stainless Steel†

316 – 316 Stainless Steel†

SC – Satin Coat (Paintable)† Sheet metal gauge may differ from standard values.

DimensionsPrice absorptive circular silencers are built to match the duct dimensions, therefore the diameter and length dimensions for the silencer must always be specified. Please consult the Standard Dimension Limits chart for available sizes.

Accessories & Custom OptionsTo meet project requirements, Price can provide additional features such as:

• Paint

• Fiberglass Cloth

• Flanges

• Transitions

• Mounting Feet

Contact your local Price sales rep for additional custom options.

Absorptive Circular SilencersCM,CH Series

Product Information

Standard Dimension Limits

Connection Diameter Length Minimum Casing GaugeMin Max Min Max

6 20 24 79 22

6 44 24 120 18

6 60 24 120 16

- Alldimensionsareininches.- Casingdiameterwillbe8incheslargerthantheconnectiondiameter.- Forsizesoutsidethestandardrange,pleasecontactyourlocalPricesalesrep.

© Copyright Price Industries Limited 2011. All Metric dimensions ( ) are soft conversion. Imperial dimensions are converted to metric and rounded to the nearest millimeter.

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M-113

Dimensional Data — Imperial (in.) / Metric (mm)

Duct Connection / Silencer Diameter Silencer Length Imperial 12 24-120 Metric 300 600-3000

Insertion Loss Length Face Velocity Pressure Drop Dynamic Insertion Loss (dB) Measured at Octave Band Center Frequencies in. (mm) fpm (m/s) in. w.g. (Pa) 63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz +4000 (+20.32) 0.32 (81) 4 6 15 25 39 42 34 26 +3000 (+15.24) 0.18 (45) 3 6 16 26 39 42 35 26 +2000 (+10.16) 0.08 (20) 3 6 16 26 39 42 34 25 +1000 (+5.08) 0.02 (5) 3 6 17 27 41 43 34 24 36 (900) 0 (0) 0.00 (0) 4 7 18 28 41 43 34 24 -1000 (-5.08) 0.02 (5) 4 7 19 29 42 44 33 22 -2000 (-10.16) 0.08 (20) 5 8 20 30 43 44 33 22 -3000 (-15.24) 0.18 (45) 5 9 21 31 43 44 32 19 -4000 (-20.32) 0.32 (81) 6 10 22 31 43 44 32 18 +4000 (+20.32) 0.42 (105) 5 8 23 41 45 47 45 36 +3000 (+15.24) 0.24 (59) 5 9 24 41 45 47 45 36 +2000 (+10.16) 0.11 (26) 5 9 25 42 47 47 45 35 +1000 (+5.08) 0.03 (7) 6 9 26 43 47 47 45 33 60 (1500) 0 (0) 0.00 (0) 6 10 28 44 47 47 45 32 -1000 (-5.08) 0.03 (7) 7 11 29 44 48 47 45 30 -2000 (-10.16) 0.11 (26) 7 12 30 45 48 47 44 28 -3000 (-15.24) 0.24 (59) 8 13 31 45 48 47 44 25 -4000 (-20.32) 0.42 (105) 9 15 32 45 48 47 44 22 +4000 (+20.32) 0.52 (130) 6 10 32 55 51 52 55 47 +3000 (+15.24) 0.29 (73) 7 11 33 55 52 52 55 46 +2000 (+10.16) 0.13 (33) 7 12 35 55 54 52 55 44 +1000 (+5.08) 0.03 (8) 8 13 35 55 53 51 55 42 84 (2100) 0 (0) 0.00 (0) 8 13 37 55 53 51 55 39 -1000 (-5.08) 0.03 (8) 9 15 38 55 53 51 55 37 -2000 (-10.16) 0.13 (33) 9 16 39 55 53 51 55 34 -3000 (-15.24) 0.29 (73) 10 17 40 55 53 50 55 31 -4000 (-20.32) 0.52 (130) 12 19 42 55 53 50 55 27 +4000 (+20.32) 0.62 (155) 8 13 40 55 55 55 55 55 +3000 (+15.24) 0.35 (87) 8 14 42 55 55 55 55 55 +2000 (+10.16) 0.16 (39) 9 15 44 55 55 55 55 53 +1000 (+5.08) 0.04 (10) 10 16 44 55 55 55 55 51 108 (2700) 0 (0) 0.00 (0) 10 17 46 55 55 55 55 47 -1000 (-5.08) 0.04 (10) 12 19 48 55 55 55 55 44 -2000 (-10.16) 0.16 (39) 12 20 49 55 55 54 55 40 -3000 (-15.24) 0.35 (87) 12 20 50 55 55 53 55 37 -4000 (-20.32) 0.62 (155) 14 24 51 55 55 53 55 32

Pressure Drop Length Pressure Drop (in. w.g. [Pa]) at a Specific Face Velocity in. (mm) 1000 fpm 2000 fpm 3000 fpm 4000 fpm 36 (900) 0.02 (5) 0.08 (20) 0.18 (45) 0.32 (81) 60 (1500) 0.03 (7) 0.11 (26) 0.24 (59) 0.42 (105) 84 (2100) 0.03 (8) 0.13 (33) 0.29 (73) 0.52 (130) 108 (2700) 0.04 (10) 0.16 (39) 0.35 (87) 0.62 (155)

Generated Noise Face Velocity Generated Noise (dB) Measured at Octave Band Center Frequencies Length fpm (m/s) 63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz +4000 (+20.32) 67 57 56 53 48 48 47 45 +3000 (+15.24) 60 47 47 45 41 41 38 36 +2000 (+10.16) 50 34 34 35 32 31 24 24 All Lengths +1000 (+5.08) 33 25 20 17 16 13 10 10 -1000 (-5.08) 40 32 28 25 25 10 10 10 -2000 (-10.16) 55 48 47 44 42 31 34 21 -3000 (-15.24) 64 57 58 55 53 47 48 40 -4000 (-20.32) 71 63 65 62 60 57 59 53

Absorptive Circular SilencersCM Series

Performance Data - Model CM/12C

Performance Notes:1. Data tables are derived from values obtained in

accordance with ASTM E477-06a.2. “+” indicates performance data for forward flow (supply)

applications.3. “-” indicates performance data for reverse flow (return)

applications.

4. Dynamic Insertion Loss is limited to 55 dB due to flanking. Please contact your local Price sales rep if insertion loss values greater than 55 dB are required.

5. Generated noise data is based on a face area of 0.08 ft2.

6. The performance data above is based on a 12 in. diameter component.

7. For performance data specific to a size not cataloged, please use Price Selection Software.

All Metric dimensions ( ) are soft conversion. © Copyright Price Industries Limited 2011. Imperial dimensions are converted to metric and rounded to the nearest millimeter.

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M-114

Insertion Loss Length Face Velocity Pressure Drop Dynamic Insertion Loss (dB) Measured at Octave Band Center Frequencies in. (mm) fpm (m/s) in. w.g. (Pa) 63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz +4000 (+20.32) 0.19 (46) 2 3 7 18 19 18 13 10 +3000 (+15.24) 0.32 (80) 2 3 8 19 20 18 13 10 +2000 (+10.16) 0.05 (12) 1 4 8 20 21 19 14 11 +1000 (+5.08) 0.01 (3) 3 4 8 20 21 19 14 12 36 (900) 0 (0) 0.00 (0) 3 5 9 21 21 18 14 10 -1000 (-5.08) 0.01 (3) 3 5 9 21 22 19 14 11 -2000 (-10.16) 0.05 (12) 3 6 10 22 23 19 14 11 -3000 (-15.24) 0.32 (80) 4 6 10 22 23 19 15 12 -4000 (-20.32) 0.19 (46) 4 7 10 23 25 19 15 12 +4000 (+20.32) 0.23 (57) 3 4 13 29 34 26 18 15 +3000 (+15.24) 0.13 (32) 3 5 13 30 35 26 18 15 +2000 (+10.16) 0.06 (14) 3 5 14 31 35 26 18 15 +1000 (+5.08) 0.01 (4) 3 6 14 32 35 25 18 15 60 (1500) 0 (0) 0.00 (0) 4 6 15 33 36 26 18 15 -1000 (-5.08) 0.01 (4) 4 7 15 34 37 26 19 15 -2000 (-10.16) 0.06 (14) 5 8 16 35 37 26 19 16 -3000 (-15.24) 0.13 (32) 5 8 16 36 38 26 19 16 -4000 (-20.32) 0.23 (57) 5 9 17 36 39 26 19 16 +4000 (+20.32) 0.27 (67) 4 6 18 40 49 33 24 20 +3000 (+15.24) 0.15 (38) 4 6 19 42 49 33 24 20 +2000 (+10.16) 0.07 (17) 4 7 19 43 49 33 23 20 +1000 (+5.08) 0.02 (4) 4 7 20 45 50 32 23 19 84 (2100) 0 (0) 0.00 (0) 5 8 21 46 51 33 23 20 -1000 (-5.08) 0.02 (4) 6 9 22 47 51 33 23 20 -2000 (-10.16) 0.07 (17) 6 10 22 48 52 33 23 20 -3000 (-15.24) 0.15 (38) 6 10 23 49 53 32 23 20 -4000 (-20.32) 0.27 (67) 6 11 24 48 53 32 23 19 +4000 (+20.32) 0.31 (78) 4 7 24 51 55 40 29 25 +3000 (+15.24) 0.18 (44) 5 8 24 53 55 40 29 25 +2000 (+10.16) 0.08 (20) 5 8 24 55 55 40 28 24 +1000 (+5.08) 0.02 (5) 5 8 26 55 55 39 27 23 108 (2700) 0 (0) 0.00 (0) 6 9 28 55 55 41 28 24 -1000 (-5.08) 0.02 (5) 7 11 28 55 55 40 28 25 -2000 (-10.16) 0.08 (20) 7 12 28 55 55 39 28 24 -3000 (-15.24) 0.18 (44) 7 12 29 55 55 39 28 24 -4000 (-20.32) 0.31 (78) 7 12 31 55 55 39 27 22

Pressure Drop Length Pressure Drop (in. w.g. [Pa]) at a Specific Face Velocity in. (mm) 1000 fpm 2000 fpm 3000 fpm 4000 fpm 36 (900) 0.01 (3) 0.05 (12) 0.32 (80) 0.19 (46) 60 (1500) 0.01 (4) 0.06 (14) 0.13 (32) 0.23 (57) 84 (2100) 0.02 (4) 0.07 (17) 0.15 (38) 0.27 (67) 108 (2700) 0.02 (5) 0.08 (20) 0.18 (44) 0.37 (78)

Generated Noise Face Velocity Generated Noise (dB) Measured at Octave Band Center Frequencies Length fpm (m/s) 63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz +4000 (+20.32) 67 56 55 52 48 47 46 44 +3000 (+15.24) 60 46 45 45 41 40 36 35 +2000 (+10.16) 49 32 32 34 32 30 23 23 All Lengths +1000 (+5.08) 32 10 10 16 15 13 10 10 -1000 (-5.08) 39 31 27 25 24 10 10 10 -2000 (-10.16) 55 47 46 43 42 29 32 19 -3000 (-15.24) 64 57 57 54 52 45 47 37 -4000 (-20.32) 71 63 65 62 59 56 57 50

Absorptive Circular SilencersCM Series

Performance Data - Model CM/24B

Dimensional Data — Imperial (in.) / Metric (mm)

Duct Connection / Silencer Diameter Silencer Length Imperial 24 24-120 Metric 600 600-3000

Performance Notes:1. Data tables are derived from values obtained in

accordance with ASTM E477-06a.2. “+” indicates performance data for forward flow (supply)

applications.3. “-” indicates performance data for reverse flow (return)

applications.

4. Dynamic Insertion Loss is limited to 55 dB due to flanking. Please contact your local Price sales rep if insertion loss values greater than 55 dB are required.

5. Generated noise data is based on a face area of 3.14 ft2.

6. The performance data above is based on a 24 in. diameter component.

7. For performance data specific to a size not cataloged, please use Price Selection Software.

© Copyright Price Industries Limited 2011. All Metric dimensions ( ) are soft conversion. Imperial dimensions are converted to metric and rounded to the nearest millimeter.

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M-115

Insertion Loss Length Face Velocity Pressure Drop Dynamic Insertion Loss (dB) Measured at Octave Band Center Frequencies in. (mm) fpm (m/s) in. w.g. (Pa) 63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz +3000 (+15.24) 0.24 (59) 3 5 10 23 35 37 23 18 +2000 (+10.16) 0.11 (26) 3 5 10 24 38 36 23 18 +1000 (+5.08) 0.03 (7) 3 5 11 25 40 36 23 18 +500 (+2.54) 0.01 (2) 4 6 11 26 41 36 23 18 36 (900) 0 (0) 0.00 (0) 4 7 12 27 41 36 23 17 -500 (-2.54) 0.01 (2) 4 7 12 28 42 36 23 17 -1000 (-5.08) 0.03 (7) 4 7 13 28 43 36 23 17 -2000 (-10.16) 0.11 (26) 5 8 13 29 45 37 23 17 -3000 (-15.24) 0.24 (59) 5 9 14 32 45 37 23 17 +3000 (+15.24) 0.28 (70) 4 7 18 37 44 44 29 24 +2000 (+10.16) 0.12 (31) 4 7 18 38 45 43 29 23 +1000 (+5.08) 0.03 (8) 5 8 19 40 46 44 28 22 +500 (+2.54) 0.01 (2) 5 9 19 41 46 44 28 22 60 (1500) 0 (0) 0.00 (0) 5 9 20 41 46 44 28 22 -500 (-2.54) 0.01 (2) 6 9 21 41 47 44 28 22 -1000 (-5.08) 0.03 (8) 6 10 21 42 47 44 28 22 -2000 (-10.16) 0.12 (31) 7 11 22 43 48 43 27 21 -3000 (-15.24) 0.28 (70) 8 13 23 44 47 43 27 20 +3000 (+15.24) 0.32 (80) 5 9 25 51 53 50 35 30 +2000 (+10.16) 0.14 (36) 6 10 26 53 53 51 34 28 +1000 (+5.08) 0.04 (9) 7 11 27 55 52 51 33 27 +500 (+2.54) 0.01 (2) 7 11 28 55 52 51 33 27 84 (2100) 0 (0) 0.00 (0) 7 11 28 55 52 51 34 27 -500 (-2.54) 0.01 (2) 7 11 29 55 52 51 33 27 -1000 (-5.08) 0.04 (9) 8 13 29 55 52 51 33 27 -2000 (-10.16) 0.14 (36) 9 15 31 55 52 49 31 25 -3000 (-15.24) 0.32 (80) 10 16 32 55 52 49 31 23 +3000 (+15.24) 0.36 (91) 7 11 33 55 55 55 41 36 +2000 (+10.16) 0.16 (40) 7 12 34 55 55 55 40 34 +1000 (+5.08) 0.04 (10) 8 14 35 55 55 55 38 32 +500 (+2.54) 0.01 (3) 8 13 36 55 55 55 38 31 108 (2700) 0 (0) 0.00 (0) 8 13 36 55 55 55 39 32 -500 (-2.54) 0.01 (3) 8 13 37 55 55 55 38 31 -1000 (-5.08) 0.04 (10) 9 15 38 55 55 55 37 32 -2000 (-10.16) 0.16 (40) 11 18 40 55 55 55 35 29 -3000 (-15.24) 0.36 (91) 12 20 41 55 55 55 34 26

Pressure Drop Length Pressure Drop (in. w.g. [Pa]) at a Specific Face Velocity in. (mm) 500 fpm 1000 fpm 2000 fpm 3000 fpm 36 (900) 0.01 (2) 0.03 (7) 0.11 (26) 0.24 (59) 60 (1500) 0.01 (2) 0.03 (8) 0.12 (31) 0.28 (70) 84 (2100) 0.01 (2) 0.04 (9) 0.14 (36) 0.32 (80) 108 (2700) 0.01 (3) 0.04 (10) 0.16 (40) 0.36 (91)

Generated Noise Face Velocity Generated Noise (dB) Measured at Octave Band Center Frequencies Length fpm (m/s) 63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz +3000 (+15.24) 70 59 58 55 50 50 50 47 +2000 (+10.16) 59 46 45 44 41 40 36 35 +1000 (+5.08) 42 22 23 26 25 23 13 14 All Lengths +500 (+2.54) 30 25 20 15 10 10 10 10 -500 (-2.54) 33 25 19 17 16 10 10 10 -1000 (-5.08) 48 40 38 35 34 18 21 10 -2000 (-10.16) 64 56 57 54 52 44 46 37 -3000 (-15.24) 73 65 67 65 62 60 61 55

Absorptive Circular SilencersCM Series

Performance Data - Model CM/24E

Dimensional Data — Imperial (in.) / Metric (mm)

Duct Connection / Silencer Diameter Silencer Length Imperial 24 24-120 Metric 600 600-3000

Performance Notes:1. Data tables are derived from values obtained in

accordance with ASTM E477-06a.2. “+” indicates performance data for forward flow (supply)

applications.3. “-” indicates performance data for reverse flow (return)

applications.

4. Dynamic Insertion Loss is limited to 55 dB due to flanking. Please contact your local Price sales rep if insertion loss values greater than 55 dB are required.

5. Generated noise data is based on a face area of 3.14 ft2.

6. The performance data above is based on a 24 in. diameter component.

7. For performance data specific to a size not cataloged, please use Price Selection Software.

All Metric dimensions ( ) are soft conversion. © Copyright Price Industries Limited 2011. Imperial dimensions are converted to metric and rounded to the nearest millimeter.

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M-116

Insertion Loss Length Face Velocity Pressure Drop Dynamic Insertion Loss (dB) Measured at Octave Band Center Frequencies in. (mm) fpm (m/s) in. w.g. (Pa) 63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz +2000 (+10.16) 0.18 (44) 4 7 15 32 49 48 47 33 +1500 (+7.62) 0.10 (25) 4 7 16 33 49 48 47 31 +1000 (+5.08) 0.04 (11) 5 8 16 35 49 48 47 31 +500 (+2.54) 0.01 (3) 5 9 17 36 49 48 47 29 36 (900) 0 (0) 0.00 (0) 6 10 18 38 49 49 46 29 -500 (-2.54) 0.01 (3) 6 11 18 39 49 49 45 27 -1000 (-5.08) 0.04 (11) 7 12 19 40 49 49 43 26 -1500 (-7.62) 0.10 (25) 7 12 20 42 49 49 43 24 -2000 (-10.16) 0.18 (44) 8 14 21 42 49 49 43 25 +2000 (+10.16) 0.21 (53) 6 11 26 45 51 51 50 41 +1500 (+7.62) 0.12 (30) 7 12 26 46 51 51 50 41 +1000 (+5.08) 0.05 (13) 7 12 27 46 51 51 50 40 +500 (+2.54) 0.01 (3) 8 13 28 47 51 51 50 39 60 (1500) 0 (0) 0.00 (0) 9 14 29 48 51 51 50 39 -500 (-2.54) 0.01 (3) 9 16 29 48 51 51 49 37 -1000 (-5.08) 0.05 (13) 10 17 30 48 51 51 49 35 -1500 (-7.62) 0.12 (30) 11 19 31 48 51 51 49 33 -2000 (-10.16) 0.21 (53) 12 20 32 48 51 51 49 33 +2000 (+10.16) 0.25 (63) 9 14 36 55 53 54 53 49 +1500 (+7.62) 0.14 (35) 10 16 36 55 53 54 52 51 +1000 (+5.08) 0.06 (16) 10 17 38 55 53 54 54 50 +500 (+2.54) 0.02 (4) 11 18 39 55 53 54 54 49 84 (2100) 0 (0) 0.00 (0) 11 19 39 55 53 53 54 49 -500 (-2.54) 0.02 (4) 12 21 40 55 53 53 54 47 -1000 (-5.08) 0.06 (16) 14 23 41 55 53 53 55 44 -1500 (-7.62) 0.14 (35) 15 25 42 54 53 53 55 41 -2000 (-10.16) 0.25 (63) 16 26 43 54 53 53 55 41 +2000 (+10.16) 0.29 (72) 11 18 47 55 55 55 55 55 +1500 (+7.62) 0.16 (41) 12 20 47 55 55 55 55 55 +1000 (+5.08) 0.07 (18) 13 21 49 55 55 55 55 55 +500 (+2.54) 0.02 (5) 14 23 50 55 55 55 55 55 108 (2700) 0 (0) 0.00 (0) 14 24 50 55 55 55 55 55 -500 (-2.54) 0.02 (5) 15 26 51 55 55 55 55 55 -1000 (-5.08) 0.07 (18) 17 28 52 55 55 55 55 53 -1500 (-7.62) 0.16 (41) 19 32 54 55 55 55 55 50 -2000 (-10.16) 0.29 (72) 19 32 54 55 55 55 55 49

Pressure Drop Length Pressure Drop (in. w.g. [Pa]) at a Specific Face Velocity in. (mm) 500 fpm 1000 fpm 1500 fpm 2000 fpm 36 (900) 0.01 (3) 0.04 (11) 0.1 (25) 0.18 (44) 60 (1500) 0.01 (3) 0.05 (13) 0.12 (30) 0.21 (53) 84 (2100) 0.02 (4) 0.06 (16) 0.14 (35) 0.25 (63) 108 (2700) 0.02 (5) 0.07 (18) 0.16 (41) 0.29 (72)

Generated Noise Face Velocity Generated Noise (dB) Measured at Octave Band Center Frequencies Length fpm (m/s) 63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz +2000 (+10.16) 74 66 64 60 55 55 56 53 +1500 (+7.62) 67 56 55 52 48 47 46 44 +1000 (+5.08) 57 42 42 42 38 37 32 32 All Lengths +500 (+2.54) 39 25 20 24 22 20 10 11 -500 (-2.54) 46 38 35 32 31 14 17 10 -1000 (-5.08) 62 54 54 51 49 40 43 32 -1500 (-7.62) 71 63 65 62 60 56 57 51 -2000 (-10.16) 77 70 72 69 67 67 68 64

Absorptive Circular SilencersCM Series

Performance Data - Model CM/24G

Dimensional Data — Imperial (in.) / Metric (mm)

Duct Connection / Silencer Diameter Silencer Length Imperial 24 24-120 Metric 600 600-3000

Performance Notes:1. Data tables are derived from values obtained in

accordance with ASTM E477-06a.2. “+” indicates performance data for forward flow (supply)

applications.3. “-” indicates performance data for reverse flow (return)

applications.

4. Dynamic Insertion Loss is limited to 55 dB due to flanking. Please contact your local Price sales rep if insertion loss values greater than 55 dB are required.

5. Generated noise data is based on a face area of 3.14 ft2.

6. The performance data above is based on a 24 in. diameter component.

7. For performance data specific to a size not cataloged, please use Price Selection Software.

© Copyright Price Industries Limited 2011. All Metric dimensions ( ) are soft conversion. Imperial dimensions are converted to metric and rounded to the nearest millimeter.

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M-117

Absorptive Circular SilencersCM Series

Performance Data - Model CM/36B

Insertion Loss Length Face Velocity Pressure Drop Dynamic Insertion Loss (dB) Measured at Octave Band Center Frequencies in. (mm) fpm (m/s) in. w.g. (Pa) 63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz +4000 (+20.32) 0.08 (20) 2 3 9 13 14 9 7 6 +3000 (+15.24) 0.05 (11) 2 3 9 13 14 9 7 6 +2000 (+10.16) 0.02 (5) 2 3 9 13 14 9 7 7 +1000 (+5.08) 0.01 (1) 2 3 9 13 14 9 7 7 36 (900) 0 (0) 0.00 (0) 2 3 9 14 14 8 6 6 -1000 (-5.08) 0.01 (1) 2 3 9 14 14 9 7 7 -2000 (-10.16) 0.02 (5) 2 4 10 14 14 9 7 7 -3000 (-15.24) 0.05 (11) 2 4 9 14 14 9 8 7 -4000 (-20.32) 0.08 (20) 2 4 9 14 14 9 8 7 +4000 (+20.32) 0.10 (24) 3 4 12 21 21 12 10 9 +3000 (+15.24) 0.05 (13) 3 4 12 21 21 12 10 9 +2000 (+10.16) 0.02 (6) 3 4 13 22 22 13 10 9 +1000 (+5.08) 0.01 (1) 3 5 13 23 22 13 10 9 60 (1500) 0 (0) 0.00 (0) 3 4 13 23 23 12 9 9 -1000 (-5.08) 0.01 (1) 3 5 13 24 23 12 10 10 -2000 (-10.16) 0.02 (6) 3 5 14 25 24 12 11 10 -3000 (-15.24) 0.05 (13) 3 5 14 25 24 11 11 10 -4000 (-20.32) 0.10 (24) 3 5 14 25 24 11 11 10 +4000 (+20.32) 0.11 (28) 3 6 16 30 29 16 13 13 +3000 (+15.24) 0.06 (16) 3 6 16 30 29 16 13 13 +2000 (+10.16) 0.03 (7) 3 6 16 31 30 17 13 12 +1000 (+5.08) 0.01 (2) 4 6 17 33 31 16 13 12 84 (2100) 0 (0) 0.00 (0) 3 6 18 33 31 15 13 12 -1000 (-5.08) 0.01 (2) 4 6 17 34 33 15 13 13 -2000 (-10.16) 0.03 (7) 4 7 18 36 34 15 14 13 -3000 (-15.24) 0.06 (16) 4 7 19 36 34 14 14 13 -4000 (-20.32) 0.11 (28) 4 7 19 36 34 14 14 13 +4000 (+20.32) 0.13 (32) 4 7 20 38 37 20 16 16 +3000 (+15.24) 0.07 (18) 4 7 20 38 37 20 16 16 +2000 (+10.16) 0.03 (8) 4 7 20 39 38 20 17 14 +1000 (+5.08) 0.01 (2) 4 7 21 42 39 20 17 14 108 (2700) 0 (0) 0.00 (0) 4 7 22 43 40 19 16 14 -1000 (-5.08) 0.01 (2) 4 7 21 44 42 18 17 16 -2000 (-10.16) 0.03 (8) 5 8 21 47 44 18 17 16 -3000 (-15.24) 0.07 (18) 5 9 24 47 44 17 17 16 -4000 (-20.32) 0.13 (32) 5 9 24 47 44 17 17 16

Pressure Drop Length Pressure Drop (in. w.g. [Pa]) at a Specific Face Velocity in. (mm) 500 fpm 1000 fpm 2000 fpm 3000 fpm 36 (900) 0.01 (1) 0.02 (5) 0.05 (11) 0.08 (20) 60 (1500) 0.01 (1) 0.02 (6) 0.05 (13) 0.10 (24) 84 (2100) 0.01 (2) 0.03 (7) 0.06 (16) 0.11 (28) 108 (2700) 0.01 (3) 0.03 (8) 0.07 (18) 0.13 (32)

Generated Noise Face Velocity Generated Noise (dB) Measured at Octave Band Center Frequencies Length fpm (m/s) 63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz +4000 (+20.32) 69 58 57 54 50 49 48 46 +3000 (+15.24) 62 48 47 47 43 42 38 37 +2000 (+10.16) 51 34 34 36 34 32 25 25 All Lengths +1000 (+5.08) 34 25 20 18 17 15 12 12 -1000 (-5.08) 41 33 29 27 26 12 12 12 -2000 (-10.16) 57 49 48 45 44 31 34 21 -3000 (-15.24) 66 59 59 56 54 47 49 39 -4000 (-20.32) 73 65 67 64 61 58 59 52

Dimensional Data — Imperial (in.) / Metric (mm)

Duct Connection / Silencer Diameter Silencer Length Imperial 36 36-120 Metric 900 900-3000

Performance Notes:1. Data tables are derived from values obtained in

accordance with ASTM E477-06a.2. “+” indicates performance data for forward flow (supply)

applications.3. “-” indicates performance data for reverse flow (return)

applications.

4. Dynamic Insertion Loss is limited to 55 dB due to flanking. Please contact your local Price sales rep if insertion loss values greater than 55 dB are required.

5. Generated noise data is based on a face area of 7.07 ft2.

6. The performance data above is based on a 36 in. diameter component.

7. For performance data specific to a size not cataloged, please use Price Selection Software.

All Metric dimensions ( ) are soft conversion. © Copyright Price Industries Limited 2011. Imperial dimensions are converted to metric and rounded to the nearest millimeter.

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M-118

Absorptive Circular SilencersCM Series

Performance Data - Model CM/36E

Insertion Loss Length Face Velocity Pressure Drop Dynamic Insertion Loss (dB) Measured at Octave Band Center Frequencies in. (mm) fpm (m/s) in. w.g. (Pa) 63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz +3000 (+15.24) 0.15 (36) 3 5 11 17 20 19 13 11 +2000 (+10.16) 0.07 (16) 3 5 11 18 21 20 13 11 +1000 (+5.08) 0.02 (4) 3 5 11 19 21 20 13 11 +500 (+2.54) 0.01 (2) 3 5 12 19 22 20 13 11 36 (900) 0 (0) 0.00 (0) 3 6 12 20 22 20 13 11 -500 (-2.54) 0.01 (2) 3 6 12 21 22 20 13 11 -1000 (-5.08) 0.02 (4) 4 6 13 21 23 20 13 12 -2000 (-10.16) 0.07 (16) 4 7 13 21 24 20 13 12 -3000 (-15.24) 0.15 (36) 4 7 13 22 24 20 13 11 +3000 (+15.24) 0.17 (43) 5 8 17 32 39 33 20 15 +2000 (+10.16) 0.08 (19) 5 8 17 33 40 33 19 15 +1000 (+5.08) 0.02 (5) 5 8 17 34 40 33 19 15 +500 (+2.54) 0.01 (2) 5 8 18 34 40 33 19 15 60 (1500) 0 (0) 0.00 (0) 5 9 18 35 41 33 18 13 -500 (-2.54) 0.01 (2) 5 9 19 36 42 33 19 14 -1000 (-5.08) 0.02 (5) 6 9 19 37 41 33 19 14 -2000 (-10.16) 0.08 (19) 6 10 19 36 41 33 19 14 -3000 (-15.24) 0.17 (43) 6 11 20 37 41 33 18 13 +3000 (+15.24) 0.20 (50) 6 10 22 46 55 47 26 19 +2000 (+10.16) 0.09 (22) 6 11 22 47 55 47 26 19 +1000 (+5.08) 0.02 (6) 7 11 23 48 55 46 25 19 +500 (+2.54) 0.01 (1) 7 11 24 49 55 46 25 18 84 (2100) 0 (0) 0.00 (0) 7 12 24 50 55 46 24 16 -500 (-2.54) 0.01 (1) 7 12 25 52 55 46 24 17 -1000 (-5.08) 0.02 (6) 8 13 25 52 55 47 25 17 -2000 (-10.16) 0.09 (22) 8 14 26 52 55 47 24 16 -3000 (-15.24) 0.20 (50) 9 15 26 53 55 47 24 15 +3000 (+15.24) 0.23 (56) 8 13 28 55 55 55 32 23 +2000 (+10.16) 0.10 (25) 8 13 28 55 55 55 32 23 +1000 (+5.08) 0.03 (6) 8 14 29 55 55 55 31 22 +500 (+2.54) 0.01 (2) 9 14 30 55 55 55 31 22 108 (2700) 0 (0) 0.00 (0) 9 15 30 55 55 55 30 19 -500 (-2.54) 0.01 (2) 9 15 31 55 55 55 30 20 -1000 (-5.08) 0.03 (6) 10 16 31 55 55 55 30 20 -2000 (-10.16) 0.10 (25) 11 18 32 55 55 55 29 19 -3000 (-15.24) 0.23 (56) 11 19 33 55 55 55 29 17

Pressure Drop Length Pressure Drop (in. w.g. [Pa]) at a Specific Face Velocity in. (mm) 500 fpm 1000 fpm 2000 fpm 3000 fpm 36 (900) 0.01 (2) 0.02 (4) 0.07 (16) 0.15 (36) 60 (1500) 0.01 (2) 0.02 (5) 0.08 (19) 0.17 (43) 84 (2100) 0.01 (1) 0.02 (6) 0.09 (22) 0.20 (50) 108 (2700) 0.01 (2) 0.03 (6) 0.10 (25) 0.23 (56)

Generated Noise Face Velocity Generated Noise (dB) Measured at Octave Band Center Frequencies Length fpm (m/s) 63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz +3000 (+15.24) 72 61 60 57 52 52 52 49 +2000 (+10.16) 61 48 47 46 43 42 38 37 +1000 (+5.08) 44 24 25 28 27 25 15 16 All Lengths +500 (+2.54) 27 25 20 15 12 12 12 12 -500 (-2.54) 35 27 21 19 18 12 12 12 -1000 (-5.08) 50 42 40 37 36 20 23 12 -2000 (-10.16) 66 58 59 56 54 46 48 39 -3000 (-15.24) 75 67 69 67 64 62 63 57

Dimensional Data — Imperial (in.) / Metric (mm)

Duct Connection / Silencer Diameter Silencer Length Imperial 24 36-120 Metric 600 900-3000

Performance Notes:1. Data tables are derived from values obtained in

accordance with ASTM E477-06a.2. “+” indicates performance data for forward flow (supply)

applications.3. “-” indicates performance data for reverse flow (return)

applications.

4. Dynamic Insertion Loss is limited to 55 dB due to flanking. Please contact your local Price sales rep if insertion loss values greater than 55 dB are required.

5. Generated noise data is based on a face area of 7.07 ft2.

6. The performance data above is based on a 36 in. diameter component.

7. For performance data specific to a size not cataloged, please use Price Selection Software.

© Copyright Price Industries Limited 2011. All Metric dimensions ( ) are soft conversion. Imperial dimensions are converted to metric and rounded to the nearest millimeter.

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M-119

Absorptive Circular SilencersCM Series

Performance Data - Model CM/36G

Insertion Loss Length Face Velocity Pressure Drop Dynamic Insertion Loss (dB) Measured at Octave Band Center Frequencies in. (mm) fpm (m/s) in. w.g. (Pa) 63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz +2000 (+10.16) 0.27 (68) 4 7 13 21 26 29 19 15 +1500 (+7.62) 0.15 (38) 4 7 13 23 28 29 19 15 +1000 (+5.08) 0.07 (17) 4 7 14 24 28 30 19 16 +500 (+2.54) 0.02 (4) 4 7 15 25 29 29 18 15 36 (900) 0 (0) 0.00 (0) 5 8 15 26 30 31 18 15 -500 (-2.54) 0.02 (4) 5 8 15 27 30 30 18 15 -1000 (-5.08) 0.07 (17) 5 8 15 27 31 30 18 16 -1500 (-7.62) 0.15 (38) 6 10 17 27 32 31 19 16 -2000 (-10.16) 0.27 (68) 6 10 17 29 33 30 18 14 +2000 (+10.16) 0.33 (83) 6 11 21 41 55 52 29 20 +1500 (+7.62) 0.19 (47) 7 11 20 43 55 52 28 20 +1000 (+5.08) 0.08 (21) 7 12 21 44 55 52 28 20 +500 (+2.54) 0.02 (5) 7 12 23 45 55 52 27 20 60 (1500) 0 (0) 0.00 (0) 8 13 23 46 55 53 27 17 -500 (-2.54) 0.02 (5) 8 13 24 47 55 53 26 18 -1000 (-5.08) 0.08 (21) 8 13 24 47 55 53 26 18 -1500 (-7.62) 0.19 (47) 9 15 24 47 55 54 26 18 -2000 (-10.16) 0.33 (83) 9 16 25 48 55 54 25 16 +2000 (+10.16) 0.40 (99) 9 15 28 55 55 55 38 26 +1500 (+7.62) 0.22 (55) 9 15 28 55 55 55 38 25 +1000 (+5.08) 0.10 (25) 10 16 29 55 55 55 36 25 +500 (+2.54) 0.02 (6) 10 16 30 55 55 55 36 24 84 (2100) 0 (0) 0.00 (0) 10 17 31 55 55 55 35 20 -500 (-2.54) 0.02 (6) 10 17 32 55 55 55 35 21 -1000 (-5.08) 0.10 (25) 11 18 32 55 55 55 34 21 -1500 (-7.62) 0.22 (55) 12 21 32 55 55 55 33 19 -2000 (-10.16) 0.40 (99) 13 22 33 55 55 55 32 17 +2000 (+10.16) 0.46 (114) 11 19 36 55 55 55 47 31 +1500 (+7.62) 0.26 (64) 11 19 36 55 55 55 47 30 +1000 (+5.08) 0.11 (29) 12 21 37 55 55 55 45 29 +500 (+2.54) 0.03 (7) 12 21 38 55 55 55 45 29 108 (2700) 0 (0) 0.00 (0) 13 22 39 55 55 55 43 23 -500 (-2.54) 0.03 (7) 13 22 40 55 55 55 43 25 -1000 (-5.08) 0.11 (29) 14 23 41 55 55 55 42 23 -1500 (-7.62) 0.26 (64) 16 26 39 55 55 55 41 21 -2000 (-10.16) 0.46 (114) 17 28 40 55 55 55 39 19

Pressure Drop Length Pressure Drop (in. w.g. [Pa]) at a Specific Face Velocity in. (mm) 500 fpm 1000 fpm 2000 fpm 3000 fpm 36 (900) 0.02 (4) 0.07 (17) 0.15 (38) 0.27 (68) 60 (1500) 0.02 (5) 0.08 (21) 0.19 (47) 0.33 (83) 84 (2100) 0.02 (6) 0.10 (25) 0.22 (55) 0.40 (99) 108 (2700) 0.03 (7) 0.11 (29) 0.26 (64) 0.46 (114)

Generated Noise Face Velocity Generated Noise (dB) Measured at Octave Band Center Frequencies Length fpm (m/s) 63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz +2000 (+10.16) 76 68 66 62 57 57 58 55 +1500 (+7.62) 69 58 57 54 50 49 48 46 +1000 (+5.08) 59 44 44 44 40 39 34 34 All Lengths +500 (+2.54) 41 25 21 26 24 22 12 13 -500 (-2.54) 48 40 37 34 33 16 19 12 -1000 (-5.08) 64 56 56 53 51 42 45 34 -1500 (-7.62) 73 65 67 64 62 58 59 53 -2000 (-10.16) 79 72 74 71 69 69 70 66

Dimensional Data — Imperial (in.) / Metric (mm)

Duct Connection / Silencer Diameter Silencer Length Imperial 36 36-120 Metric 900 900-3000

Performance Notes:1. Data tables are derived from values obtained in

accordance with ASTM E477-06a.2. “+” indicates performance data for forward flow (supply)

applications.3. “-” indicates performance data for reverse flow (return)

applications.

4. Dynamic Insertion Loss is limited to 55 dB due to flanking. Please contact your local Price sales rep if insertion loss values greater than 55 dB are required.

5. Generated noise data is based on a face area of 7.07 ft2.

6. The performance data above is based on a 36 in. diameter component.

7. For performance data specific to a size not cataloged, please use Price Selection Software.

All Metric dimensions ( ) are soft conversion. © Copyright Price Industries Limited 2011. Imperial dimensions are converted to metric and rounded to the nearest millimeter.

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M-120

Pressure Drop Length Pressure Drop (in. w.g. [Pa]) at a Specific Face Velocity in. (mm) 1000 fpm 2000 fpm 3000 fpm 4000 fpm 36 (900) 0.01 (1) 0.02 (5) 0.08 (20) 0.17 (44) 60 (1500) 0.01 (2) 0.03 (8) 0.13 (33) 0.29 (73) 84 (2100) 0.02 (3) 0.05 (12) 0.19 (46) 0.41 (102) 108 (2700) 0.02 (4) 0.06 (15) 0.24 (60) 0.52 (131)

Generated Noise Face Velocity Generated Noise (dB) Measured at Octave Band Center Frequencies Length fpm (m/s) 63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz +6000 (+30.48) 70 61 60 56 51 51 51 49 +4000 (+20.32) 60 47 47 45 41 41 38 36 +2000 (+10.16) 43 24 24 27 25 23 14 16 All Lengths +1000 (+5.08) 30 25 20 15 10 10 10 10 -1000 (-5.08) 33 25 20 18 17 10 10 10 -2000 (-10.16) 49 41 39 36 35 20 23 10 -4000 (-20.32) 64 57 58 55 53 47 48 40 -6000 (-30.48) 74 66 68 66 63 62 63 58

Insertion LossLength

in. (mm)Face Velocity

fpm (m/s)Pressure Drop

in. w.g. (Pa)Dynamic Insertion Loss (dB) Measured at Octave Band Center Frequencies

63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz+6000 (+30.48) 0.17 (44) 3 5 13 21 29 20 15 12+4000 (+20.32) 0.08 (20) 3 5 14 22 30 20 15 13+2000 (+10.16) 0.02 (5) 3 5 15 24 30 20 15 14+1000 (+5.08) 0.01 (1) 3 5 15 24 30 20 14 14

36 (900) 0 (0) 0.00 (0) 3 5 16 25 31 20 14 14-1000 (-5.08) 0.01 (1) 3 5 17 25 31 20 14 14

-2000 (-10.16) 0.02 (5) 3 6 17 26 31 20 14 12-4000 (-20.32) 0.08 (20) 4 7 18 27 32 19 12 10-6000 (-30.48) 0.17 (44) 4 7 19 27 32 18 12 9+6000 (+30.48) 0.29 (73) 4 6 20 37 44 28 21 19+4000 (+20.32) 0.13 (33) 4 7 20 37 44 27 20 20+2000 (+10.16) 0.03 (8) 4 7 22 39 43 27 19 20+1000 (+5.08) 0.01 (2) 5 8 22 40 44 27 19 19

60 (1500) 0 (0) 0.00 (0) 5 8 23 42 44 27 18 18-1000 (-5.08) 0.01 (2) 5 9 24 42 44 26 17 17

-2000 (-10.16) 0.03 (8) 5 9 25 42 44 26 17 15-4000 (-20.32) 0.13 (33) 6 11 26 38 41 24 15 12-6000 (-30.48) 0.29 (73) 7 12 27 38 41 24 14 10+6000 (+30.48) 0.41 (102) 5 8 26 53 55 36 26 25+4000 (+20.32) 0.19 (46) 6 10 27 52 55 35 25 26+2000 (+10.16) 0.05 (12) 6 10 29 54 55 34 24 25+1000 (+5.08) 0.01 (3) 6 10 30 55 55 34 23 25

84 (2100) 0 (0) 0.00 (0) 6 11 31 55 55 34 22 22-1000 (-5.08) 0.01 (3) 7 12 31 55 55 33 21 21

-2000 (-10.16) 0.05 (12) 7 12 33 55 55 32 19 17-4000 (-20.32) 0.19 (46) 8 14 34 49 50 29 18 13-6000 (-30.48) 0.41 (102) 9 16 35 49 50 29 17 11+6000 (+30.48) 0.52 (131) 6 10 33 55 55 44 32 32+4000 (+20.32) 0.24 (60) 7 12 34 55 55 42 30 32+2000 (+10.16) 0.06 (15) 7 12 36 55 55 41 28 31+1000 (+5.08) 0.02 (4) 8 13 37 55 55 40 28 30

108 (2700) 0 (0) 0.00 (0) 8 13 38 55 55 40 26 26-1000 (-5.08) 0.02 (4) 9 16 39 55 55 39 24 24

-2000 (-10.16) 0.06 (15) 9 15 40 55 55 38 22 20-4000 (-20.32) 0.24 (60) 11 18 42 55 55 35 21 15-6000 (-30.48) 0.52 (131) 12 20 43 55 55 34 20 13

Absorptive Circular SilencersCH Series

Performance Data - Model CH/12A

Dimensional Data — Imperial (in.) / Metric (mm)

Duct Connection / Silencer Diameter Silencer Length Imperial 12 24-120 Metric 300 600-3000

Performance Notes:1. Data tables are derived from values obtained in

accordance with ASTM E477-06a.2. “+” indicates performance data for forward flow (supply)

applications.3. “-” indicates performance data for reverse flow (return)

applications.

4. Dynamic Insertion Loss is limited to 55 dB due to flanking. Please contact your local Price sales rep if insertion loss values greater than 55 dB are required.

5. Generated noise data is based on a face area of 0.80 ft2.

6. The performance data above is based on a 12 in. diameter component.

7. For performance data specific to a size not cataloged, please use Price Selection Software.

© Copyright Price Industries Limited 2011. All Metric dimensions ( ) are soft conversion. Imperial dimensions are converted to metric and rounded to the nearest millimeter.

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M-121

Pressure Drop Length Pressure Drop (in. w.g. [Pa]) at a Specific Face Velocity in. (mm) 1000 fpm 2000 fpm 4000 fpm 6000 fpm 36 (900) 0.01 (2) 0.01 (2) 0.03 (8) 0.07 (19) 60 (1500) 0.01 (2) 0.01 (3) 0.05 (13) 0.12 (31) 84 (2100) 0.01 (2) 0.02 (5) 0.07 (18) 0.17 (43) 108 (2700) 0.01 (2) 0.02 (6) 0.10 (25) 0.22 (56)

Generated Noise Face Velocity Generated Noise (dB) Measured at Octave Band Center Frequencies Length fpm (m/s) 63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz +6000 (+30.48) 72 63 62 58 53 53 53 51 +4000 (+20.32) 62 49 49 47 43 43 40 38 +2000 (+10.16) 45 26 26 29 27 25 16 18 All Lengths +1000 (+5.08) 27 25 20 15 11 10 10 10 -1000 (-5.08) 35 27 22 20 19 10 10 10 -2000 (-10.16) 51 43 41 38 37 22 25 10 -4000 (-20.32) 66 59 60 57 55 49 50 42 -6000 (-30.48) 76 68 70 68 65 64 65 60

Absorptive Circular SilencersCH Series

Performance Data - Model CH/24A

Dimensional Data — Imperial (in.) / Metric (mm)

Duct Connection / Silencer Diameter Silencer Length Imperial 24 24-120 Metric 600 600-3000

Insertion LossLength

in. (mm)Face Velocity

fpm (m/s)Pressure Drop

in. w.g. (Pa)Dynamic Insertion Loss (dB) Measured at Octave Band Center Frequencies

63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz+6000 (+30.48) 0.07 (19) 2 3 7 15 16 9 7 7+4000 (+20.32) 0.03 (8) 2 3 6 16 16 9 7 7+2000 (+10.16) 0.01 (2) 2 3 7 16 16 9 7 8+1000 (+5.08) 0.01 (2) 2 3 7 17 17 9 7 8

36 (900) 0 (0) 0.00 (0) 2 4 8 17 17 9 8 9-1000 (-5.08) 0.01 (2) 2 4 8 18 17 9 8 8

-2000 (-10.16) 0.01 (2) 2 4 8 18 17 10 9 9-4000 (-20.32) 0.03 (8) 3 5 9 19 18 11 10 11-6000 (-30.48) 0.07 (19) 4 6 10 20 18 13 12 12+6000 (+30.48) 0.12 (31) 2 3 12 26 22 12 10 10+4000 (+20.32) 0.05 (13) 2 4 12 27 22 12 10 10+2000 (+10.16) 0.01 (3) 3 4 13 28 22 12 11 12+1000 (+5.08) 0.01 (2) 3 5 13 28 22 12 11 12

60 (1500) 0 (0) 0.00 (0) 3 5 14 29 22 12 11 13-1000 (-5.08) 0.01 (2) 3 5 14 30 22 13 12 12

-2000 (-10.16) 0.01 (2) 3 6 14 30 22 13 12 12-4000 (-20.32) 0.05 (13) 4 7 15 31 22 14 13 14-6000 (-30.48) 0.12 (31) 5 8 16 31 22 15 13 13+6000 (+30.48) 0.17 (43) 2 4 16 36 29 15 13 13+4000 (+20.32) 0.07 (18) 3 5 17 38 28 15 14 14+2000 (+10.16) 0.02 (5) 3 5 18 40 28 16 15 16+1000 (+5.08) 0.01 (2) 4 6 18 40 27 15 15 16

84 (2100) 0 (0) 0.00 (0) 4 6 19 41 27 15 15 17-1000 (-5.08) 0.01 (2) 4 7 20 42 27 16 15 15

-2000 (-10.16) 0.02 (5) 4 7 20 42 26 16 15 16-4000 (-20.32) 0.07 (18) 5 8 22 43 26 17 16 16-6000 (-30.48) 0.17 (43) 6 11 23 43 26 18 15 15+6000 (+30.48) 0.22 (56) 3 5 21 46 35 18 16 17+4000 (+20.32) 0.10 (24) 3 6 23 49 34 19 17 18+2000 (+10.16) 0.02 (6) 4 6 23 52 33 19 19 21+1000 (+5.08) 0.01 (2) 4 7 24 52 32 19 18 21

108 (2700) 0 (0) 0.00 (0) 4 7 25 54 33 18 18 20-1000 (-5.08) 0.01 (2) 2 8 26 54 32 19 18 19

-2000 (-10.16) 0.02 (6) 5 9 26 54 31 19 19 19-4000 (-20.32) 0.10 (24) 6 10 28 55 30 20 18 19-6000 (-30.48) 0.22 (56) 8 13 29 54 30 20 17 16

Performance Notes:1. Data tables are derived from values obtained in

accordance with ASTM E477-06a.2. “+” indicates performance data for forward flow (supply)

applications.3. “-” indicates performance data for reverse flow (return)

applications.

4. Dynamic Insertion Loss is limited to 55 dB due to flanking. Please contact your local Price sales rep if insertion loss values greater than 55 dB are required.

5. Generated noise data is based on a face area of 3.14 ft2.

6. The performance data above is based on a 24 in. diameter component.

7. For performance data specific to a size not cataloged, please use Price Selection Software.

All Metric dimensions ( ) are soft conversion. © Copyright Price Industries Limited 2011. Imperial dimensions are converted to metric and rounded to the nearest millimeter.

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M-122

Insertion Loss Length Face Velocity Pressure Drop Dynamic Insertion Loss (dB) Measured at Octave Band Center Frequencies in. (mm) fpm (m/s) in. w.g. (Pa) 63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz +6000 (+30.48) 0.12 (31) 1 2 8 10 8 4 4 3 +4000 (+20.32) 0.06 (14) 1 2 7 10 8 4 4 3 +2000 (+10.16) 0.01 (3) 1 2 7 10 8 4 4 4 +1000 (+5.08) 0.01 (2) 2 3 7 10 8 3 4 4 36 (900) 0 (0) 0.00 (0) 2 3 8 10 8 3 3 5 -1000 (-5.08) 0.01 (2) 2 3 8 10 8 4 4 4 -2000 (-10.16) 0.01 (3) 2 3 8 10 8 4 4 4 -4000 (-20.32) 0.06 (14) 2 3 8 10 8 4 4 4 -6000 (-30.48) 0.12 (31) 2 3 8 10 8 4 4 4 +6000 (+30.48) 0.15 (37) 2 4 11 18 13 8 7 6 +4000 (+20.32) 0.07 (17) 2 4 11 17 13 8 7 6 +2000 (+10.16) 0.02 (4) 2 4 11 18 13 8 7 6 +1000 (+5.08) 0.01 (2) 2 4 11 17 13 7 7 7 60 (1500) 0 (0) 0.00 (0) 2 4 12 17 13 7 7 7 -1000 (-5.08) 0.01 (2) 2 4 12 17 12 8 7 6 -2000 (-10.16) 0.02 (4) 3 5 12 17 12 8 7 6 -4000 (-20.32) 0.07 (17) 3 5 12 17 12 8 7 6 -6000 (-30.48) 0.15 (37) 3 4 12 17 12 8 7 6 +6000 (+30.48) 0.17 (43) 3 5 15 25 18 11 10 8 +4000 (+20.32) 0.08 (19) 3 5 15 25 18 11 10 8 +2000 (+10.16) 0.02 (5) 3 5 15 25 18 12 10 8 +1000 (+5.08) 0.01 (2) 3 5 15 25 18 11 10 9 84 (2100) 0 (0) 0.00 (0) 3 5 16 25 18 11 10 9 -1000 (-5.08) 0.01 (2) 3 5 16 24 17 11 10 9 -2000 (-10.16) 0.02 (5) 4 6 16 24 16 11 11 9 -4000 (-20.32) 0.08 (19) 4 6 16 24 16 11 10 9 -6000 (-30.48) 0.17 (43) 4 6 16 23 16 11 10 8 +6000 (+30.48) 0.20 (49) 4 6 19 33 23 15 13 10 +4000 (+20.32) 0.09 (22) 4 6 19 32 23 15 14 11 +2000 (+10.16) 0.02 (5) 4 6 19 33 23 15 14 10 +1000 (+5.08) 0.01 (1) 3 6 20 32 22 15 14 12 108 (2700) 0 (0) 0.00 (0) 4 6 20 32 23 16 14 10 -1000 (-5.08) 0.01 (1) 4 6 20 31 22 15 14 12 -2000 (-10.16) 0.02 (5) 5 8 20 31 20 15 14 12 -4000 (-20.32) 0.09 (22) 5 8 20 31 20 15 14 11 -6000 (-30.48) 0.20 (49) 4 7 20 30 19 14 13 11

Pressure Drop Length Pressure Drop (in. w.g. [Pa]) at a Specific Face Velocity in. (mm) 1000 fpm 2000 fpm 4000 fpm 6000 fpm 36 (900) 0.01 (2) 0.01 (3) 0.06 (14) 0.12 (31) 60 (1500) 0.01 (2) 0.02 (4) 0.07 (17) 0.15 (37) 84 (2100) 0.01 (2) 0.02 (5) 0.08 (19) 0.17 (43) 108 (2700) 0.01 (1) 0.02 (5) 0.09 (22) 0.20 (49)

Generated Noise Face Velocity Generated Noise (dB) Measured at Octave Band Center Frequencies Length fpm (m/s) 63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz +6000 (+30.48) 74 65 64 60 55 55 55 53 +4000 (+20.32) 64 51 51 49 45 45 42 40 +2000 (+10.16) 47 28 28 31 29 27 18 20 All Lengths +1000 (+5.08) 29 25 20 15 13 12 12 12 -1000 (-5.08) 37 29 24 22 21 12 12 12 -2000 (-10.16) 53 45 43 40 39 24 27 12 -4000 (-20.32) 68 61 62 59 57 51 52 44 -6000 (-30.48) 78 70 72 70 67 66 67 62

Absorptive Circular SilencersCH Series

Performance Data - Model CH/36A

Dimensional Data — Imperial (in.) / Metric (mm)

Duct Connection / Silencer Diameter Silencer Length Imperial 36 36-120 Metric 900 900-3000

Performance Notes:1. Data tables are derived from values obtained in

accordance with ASTM E477-06a.2. “+” indicates performance data for forward flow (supply)

applications.3. “-” indicates performance data for reverse flow (return)

applications.

4. Dynamic Insertion Loss is limited to 55 dB due to flanking. Please contact your local Price sales rep if insertion loss values greater than 55 dB are required.

5. Generated noise data is based on a face area of 7.07 ft2.

6. The performance data above is based on a 36 in. diameter component.

7. For performance data specific to a size not cataloged, please use Price Selection Software.

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10 All Metric dimensions ( ) are soft conversion. © copyright e.H. Price limited 2008. imperial dimensions are converted to metric and rounded to the nearest millimeter.

SilencersSuggested Specification

Suggested Specification

Absorptive Circular Silencers CM, CH

GeneralFurnish and install Price Absorptive circular Silencers of the sizes, configuration, and performance as described on plans and/or air distribution schedules. Silencer inlet and outlet connections shall be equal to the duct sizes shown on the drawings. Duct transitions are not permitted unless shown on the drawings and approved by the engineer.

PerformanceSilencer performance characteristics including insertion loss, pressure drop, and generated noise shall have been attained through testing in accordance with the ASTM e477-06a test standard for acoustical duct silencers. laboratory performance verification may be requested in the manufacture’s test facility and a comparative test report made available to the engineer.

ConstructionSilencers shall consist of solid steel casing as noted in table below, perforated liners and absorptive acoustic fiberglass media.

Connection Diameter Minimum Casing GaugeMin Max

6 20 226 44 18 6 60 16

(Standard) Construction Class 1: 22ga galvanized casing / 22ga galvanized perforated liner(Optional) Construction Class 2: 18ga galvanized casing / 22ga galvanized perforated liner(Optional) Construction Class 3: 16ga galvanized casing / 22ga galvanized perforated liner

Acceptable methods of fastening shall be button lock, Pittsburgh lock, and welds. in situations where these methods are not feasible, rivets can be used. Screws or other mechanical fasteners will not be acceptable.

The silencer perforated liners shall be rigidly fastened to the casing of the silencer on both ends and attached to the outer casing with a minimum of two stiffeners.

Acoustic media shall be shot free inorganic glass fiber with long, resilient fibers, bonded with thermosetting resin. Glass fiber shall be packed with a minimum 10% compression to eliminate voids and settling; density shall be consistent with that used to generate catalogued test data.

Where internal velocities exceed 4000 fpm a fiberglass cloth shall be added to the

silencer between the internal perforated liner and the acoustic media to protect the media from erosion.

combustion ratings for acoustic media shall be equal to or less than the combustion ratings noted below when tested in accordance with ASTM e84, Ul723, and nFPA255:

Flame Spread classification: 25

Smoke Development rating: 50

SubmittalProvide manufacturers performance data for dynamic insertion loss, generated noise, and pressure drop which has been obtained in accordance with ASTM e477-06a. Data for each scheduled silencer shall be provided with the size, configuration, air volume, and airflow direction as appears on the drawing and/or schedule.

Randy's_SilencerCatalog with dat10 10 2/3/2009 9:11:30 AM