4. absorptive circular film lined silencers

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

SIL

EN

CE

RS

& P

AN

ELS

M-237

Models

Circular Film Lined SilencersCircular Medium Velocity Film Lined CMTCircular High Velocity Film Lined CHTPRICE Absorptive Circular Film Lined Silencers are designed to provide a practical solution for controlling undesirable noise in circular ductwork systems. A thin polymer film liner encapsulates the acoustic media to protect it from moisture and airborne contaminants that may be present in the duct systems. A minimal system pressure drop is maintained by utilizing the same internal geometry of the standard absorptive silencers. This sleek internal 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• Thin polymer film liner that encapsulates

the acoustic media for added protection.• Acoustic standoff that separates the film

liner from the perforated metal to ensure the highest levels of insertion loss.

• Eliminates costly square to round transitions.

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

• 2” slip connection on both ends.

CMT SilencersPrice CMT silencers are designed for medium velocity applications. This medium velocity configuration provides high levels of insertion loss across the full range of frequencies. 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.

CHT SilencersPrice CHT silencers are designed for high velocity applications and have no center pods that enter the air stream to constrict the air flow. The design minimizes the pressure drop that can occur at higher velocities, while still providing high levels of insertion loss across the full range of frequencies. The Price CHT Silencer model is best suited for applications where low pressure drops are the priority or high air velocities cannot be avoided.

Absorptive Circular Film Lined SilencersCMT, CHT Series

Product Information

CMT - Circular Medium Velocity

CHT - 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 ...............M239-M248Suggested Specification ................M364

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

SIL

EN

CE

RS

& P

AN

ELS

M-238

ConstructionPrice absorptive circular film lined silencers consist of a solid metal casing, perforated metal liner, film liner, acoustic standoff, 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



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

LinerA thin polymer film is wrapped around the fiberglass media to provide a barrier against elements that may be found in the air stream. To ensure that acoustic performance is maintained, an acoustic standoff is placed between the perforated metal and the film liner.

DimensionsPrice absorptive circular film lined 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 of features such as:

• Paint

• Flanges

• Transitions

• Mounting Feet

Contact your local Price sales rep for additional custom options.

Absorptive Circular Film Lined SilencersCMT, CHT 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.- Casingdiameterwillbe16incheslargerthantheconnectiondiameter.- Forsizesoutsidethestandardrange,pleasecontactyourlocalPricesalesrep.


SIL

EN

CE

RS

& P

AN

ELS

M-239

Absorptive Circular Film Lined SilencersCMT Series

Performance Data - Model CMT/12C

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

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

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

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+4000 (+20.32) 0.17 (44) 4 5 11 17 33 42 34 23+3000 (+15.24) 0.08 (20) 3 5 12 18 33 42 35 23+2000 (+10.16) 0.02 (5) 3 5 12 19 34 42 34 23+1000 (+5.08) 0.01 (1) 3 5 13 19 34 43 34 21

36 (900) 0 (0) 0.00 (0) 4 5 14 20 35 43 34 21-1000 (-5.08) 0.01 (1) 4 5 15 20 36 44 33 20

-2000 (-10.16) 0.02 (5) 5 6 15 21 36 44 33 19-3000 (-15.24) 0.08 (20) 5 7 16 21 37 44 32 17-4000 (-20.32) 0.17 (44) 6 8 17 22 37 44 32 16+4000 (+20.32) 0.29 (73) 5 7 18 29 38 47 45 33+3000 (+15.24) 0.13 (33) 5 7 18 29 39 47 45 32+2000 (+10.16) 0.03 (8) 5 7 19 29 40 47 45 31+1000 (+5.08) 0.01 (2) 6 7 20 30 40 47 45 30

60 (1500) 0 (0) 0.00 (0) 6 8 21 31 40 47 45 28-1000 (-5.08) 0.01 (2) 7 9 22 31 40 47 45 27

-2000 (-10.16) 0.03 (8) 7 9 22 32 41 47 44 25-3000 (-15.24) 0.13 (33) 8 10 23 32 41 47 44 23-4000 (-20.32) 0.29 (73) 9 12 24 32 41 47 44 20+4000 (+20.32) 0.41 (102) 6 8 24 39 43 52 55 42+3000 (+15.24) 0.19 (46) 7 9 25 39 44 52 55 41+2000 (+10.16) 0.05 (12) 7 10 26 39 46 52 55 40+1000 (+5.08) 0.01 (3) 8 10 27 39 45 51 55 38

84 (2100) 0 (0) 0.00 (0) 8 11 28 39 45 51 55 35-1000 (-5.08) 0.01 (3) 9 12 29 39 45 51 55 33

-2000 (-10.16) 0.05 (12) 9 13 29 39 45 51 55 31-3000 (-15.24) 0.19 (46) 10 13 30 39 45 50 55 28-4000 (-20.32) 0.41 (102) 12 16 31 39 45 50 55 24+4000 (+20.32) 0.52 (131) 8 10 30 39 47 55 55 50+3000 (+15.24) 0.24 ( 60) 8 11 31 39 47 55 55 50+2000 (+10.16) 0.06 (15) 9 12 33 39 47 55 55 48+1000 (+5.08) 0.02 (4) 10 13 33 39 47 55 55 46

108 (2700) 0 (0) 0.00 (0) 10 13 35 39 47 55 55 42-1000 (-5.08) 0.02 (4) 12 15 36 39 47 55 55 40

-2000 (-10.16) 0.06 (15) 12 16 36 39 47 54 55 36-3000 (-15.24) 0.24 (60) 12 16 37 39 47 53 55 33-4000 (-20.32) 0.52 (131) 14 19 38 39 47 53 55 29

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” diameter

component.7. For performance data specific to a size not cataloged,

please use Price Selection Software.


SIL

EN

CE

RS

& P

AN

ELS

M-240


Performance Data - Model CMT/24B










36 (900) 0 (0) 0.00 (0) 3 4 7 14 18 18 14 9-1000 (-5.08) 0.01 (3) 3 4 7 15 19 19 14 10

-2000 (-10.16) 0.05 (12) 3 4 7 15 19 19 14 10-3000 (-15.24) 0.32 (80) 4 5 8 16 20 19 15 10-4000 (-20.32) 0.19 (46) 4 6 8 16 21 19 15 11+4000 (+20.32) 0.23 (57) 3 4 10 20 29 26 18 13+3000 (+15.24) 0.13 (32) 3 4 10 21 29 26 18 14+2000 (+10.16) 0.06 (14) 3 4 10 22 30 26 18 14+1000 (+5.08) 0.01 (4) 3 5 10 23 30 25 18 14

60 (1500) 0 (0) 0.00 (0) 4 5 11 23 31 26 18 14-1000 (-5.08) 0.01 (4) 4 6 12 24 31 26 19 14

-2000 (-10.16) 0.06 (14) 5 6 12 24 32 26 19 14-3000 (-15.24) 0.13 (32) 5 7 12 25 32 26 19 14-4000 (-20.32) 0.23 (57) 5 7 13 25 33 26 19 14+4000 (+20.32) 0.27 (67) 4 5 14 28 41 33 24 18+3000 (+15.24) 0.15 (38) 4 5 14 29 42 33 24 18+2000 (+10.16) 0.07 (17) 4 5 14 30 42 33 23 18+1000 (+5.08) 0.02 (4) 4 6 15 31 42 32 23 17

84 (2100) 0 (0) 0.00 (0) 5 6 16 32 43 33 23 18-1000 (-5.08) 0.02 (4) 6 7 16 33 44 33 23 18

-2000 (-10.16) 0.07 (17) 6 8 16 33 44 33 23 18-3000 (-15.24) 0.15 (38) 6 8 17 34 45 32 23 18-4000 (-20.32) 0.27 (67) 6 8 18 34 45 32 23 17+4000 (+20.32) 0.31 (78) 4 6 18 36 47 40 29 22+3000 (+15.24) 0.18 (44) 5 6 18 37 47 40 29 22+2000 (+10.16) 0.08 (20) 5 7 18 38 47 40 28 22+1000 (+5.08) 0.02 (5) 5 7 19 39 47 39 27 21

108 (2700) 0 (0) 0.00 (0) 6 7 21 39 47 41 28 22-1000 (-5.08) 0.02 (5) 7 9 21 39 47 40 28 22

-2000 (-10.16) 0.08 (20) 7 10 21 39 47 39 28 22-3000 (-15.24) 0.18 (44) 7 10 22 39 47 39 28 22-4000 (-20.32) 0.31 (78) 7 10 23 39 47 39 27 20



applications.







SIL

EN

CE

RS

& P

AN

ELS

M-241


Performance Data - Model CMT/24E










36 (900) 0 (0) 0.00 (0) 4 5 9 19 35 36 23 15-500 (-2.54) 0.01 (2) 4 6 9 19 36 36 23 15

-1000 (-5.08) 0.03 (7) 4 6 10 20 37 36 23 15-2000 (-10.16) 0.11 (26) 5 6 10 20 39 37 23 15-3000 (-15.24) 0.24 (59) 5 7 11 23 38 37 23 15+3000 (+15.24) 0.28 (70) 4 5 13 26 38 44 29 21+2000 (+10.16) 0.12 (31) 4 6 14 27 39 43 29 21+1000 (+5.08) 0.03 (8) 5 6 14 28 39 44 28 20+500 (+2.54) 0.01 (2) 5 7 14 28 39 44 28 20

60 (1500) 0 (0) 0.00 (0) 5 7 15 29 39 44 28 20-500 (-2.54) 0.01 (2) 6 7 15 29 40 44 28 19

-1000 (-5.08) 0.03 (8) 6 8 16 29 40 44 28 19-2000 (-10.16) 0.12 (31) 7 9 16 30 40 43 27 19-3000 (-15.24) 0.28 (70) 8 10 17 31 40 43 27 18+3000 (+15.24) 0.32 (80) 5 7 19 36 45 50 35 27+2000 (+10.16) 0.14 (36) 6 8 20 37 45 51 34 26+1000 (+5.08) 0.04 (9) 7 9 20 38 44 51 33 24+500 (+2.54) 0.01 (2) 7 9 21 39 44 51 33 24

84 (2100) 0 (0) 0.00 (0) 7 9 21 38 44 51 34 24-500 (-2.54) 0.01 (2) 7 9 22 39 44 51 33 24

-1000 (-5.08) 0.04 (9) 8 10 22 39 44 51 33 24-2000 (-10.16) 0.14 (36) 9 12 23 39 44 49 31 22-3000 (-15.24) 0.32 (80) 10 13 24 38 44 49 31 21+3000 (+15.24) 0.36 (91) 7 9 24 39 47 55 41 32+2000 (+10.16) 0.16 (40) 7 10 25 39 47 55 40 30+1000 (+5.08) 0.04 (10) 8 11 26 39 47 55 38 29+500 (+2.54) 0.01 (3) 8 11 27 39 47 55 38 28

108 (2700) 0 (0) 0.00 (0) 8 11 27 39 47 55 39 29-500 (-2.54) 0.01 (3) 8 11 28 39 47 55 38 28

-1000 (-5.08) 0.04 (10) 9 12 28 39 47 55 37 29-2000 (-10.16) 0.16 (40) 11 14 30 39 47 55 35 26-3000 (-15.24) 0.36 (91) 12 16 31 39 47 55 34 24



applications.







SIL

EN

CE

RS

& P

AN

ELS

M-242


Performance Data - Model CMT/24G










36 (900) 0 (0) 0.00 (0) 6 8 13 27 42 49 46 26-500 (-2.54) 0.01 (3) 6 8 14 27 42 49 45 24

-1000 (-5.08) 0.04 (11) 7 9 15 28 42 49 43 23-1500 (-7.62) 0.10 (25) 7 10 15 29 42 49 43 22

-2000 (-10.16) 0.18 (44) 8 11 15 30 42 49 43 23+2000 (+10.16) 0.21 (53) 6 8 19 32 43 51 50 37+1500 (+7.62) 0.12 (30) 7 9 19 32 43 51 50 37+1000 (+5.08) 0.05 (13) 7 10 20 32 43 51 50 36+500 (+2.54) 0.01 (3) 8 11 21 33 43 51 50 35

60 (1500) 0 (0) 0.00 (0) 9 11 21 33 43 51 50 35-500 (-2.54) 0.01 (3) 9 12 22 33 43 51 49 33

-1000 (-5.08) 0.05 (13) 10 14 23 33 43 51 49 31-1500 (-7.62) 0.12 (30) 11 15 23 34 43 51 49 30

-2000 (-10.16) 0.21 (53) 12 16 24 34 43 51 49 30+2000 (+10.16) 0.25 (63) 9 11 27 39 45 54 53 44+1500 (+7.62) 0.14 (35) 10 13 27 39 45 54 52 46+1000 (+5.08) 0.06 (16) 10 14 29 39 45 54 54 45+500 (+2.54) 0.02 (4) 11 14 29 39 45 54 54 44

84 (2100) 0 (0) 0.00 (0) 11 15 30 39 45 53 54 44-500 (-2.54) 0.02 (4) 12 16 30 39 45 53 54 43

-1000 (-5.08) 0.06 (16) 14 18 31 38 45 53 55 40-1500 (-7.62) 0.14 (35) 15 20 32 38 45 53 55 37

-2000 (-10.16) 0.25 (63) 16 21 32 38 45 53 55 37+2000 (+10.16) 0.29 (72) 11 14 35 39 47 55 55 50+1500 (+7.62) 0.16 (41) 12 16 35 39 47 55 55 50+1000 (+5.08) 0.07 (18) 13 17 37 39 47 55 55 50+500 (+2.54) 0.02 (5) 14 18 37 39 47 55 55 50

108 (2700) 0 (0) 0.00 (0) 14 19 38 39 47 55 55 50-500 (-2.54) 0.02 (5) 15 21 38 39 47 55 55 50

-1000 (-5.08) 0.07 (18) 17 22 39 39 47 55 55 48-1500 (-7.62) 0.16 (41) 19 25 40 39 47 55 55 45

-2000 (-10.16) 0.29 (72) 19 26 41 39 47 55 55 44



applications.







SIL

EN

CE

RS

& P

AN

ELS

M-243








36 (900) 0 (0) 0.00 (0) 2 2 7 10 12 8 6 6-1000 (-5.08) 0.01 (1) 2 2 7 10 12 9 7 6

-2000 (-10.16) 0.02 (5) 2 3 7 10 12 9 7 6-3000 (-15.24) 0.05 (11) 2 3 7 10 12 9 8 6-4000 (-20.32) 0.08 (20) 2 3 7 10 12 9 8 6+4000 (+20.32) 0.10 (24) 3 3 9 15 18 12 10 9+3000 (+15.24) 0.05 (13) 3 3 9 15 18 12 10 9+2000 (+10.16) 0.02 (6) 3 3 10 15 18 13 10 8+1000 (+5.08) 0.01 (1) 3 4 10 16 19 13 10 8

60 (1500) 0 (0) 0.00 (0) 3 3 10 16 19 12 9 8-1000 (-5.08) 0.01 (1) 3 4 10 17 20 12 10 9

-2000 (-10.16) 0.02 (6) 3 4 10 18 20 12 11 9-3000 (-15.24) 0.05 (13) 3 4 11 18 21 11 11 9-4000 (-20.32) 0.10 (24) 3 4 11 18 21 11 11 9+4000 (+20.32) 0.11 (28) 3 5 12 21 25 16 13 11+3000 (+15.24) 0.06 (16) 3 5 12 21 25 16 13 11+2000 (+10.16) 0.03 (7) 3 5 12 21 25 17 13 11+1000 (+5.08) 0.01 (2) 4 5 13 23 26 16 13 10

84 (2100) 0 (0) 0.00 (0) 3 4 13 23 27 15 13 11-1000 (-5.08) 0.01 (2) 4 5 13 24 28 15 13 12

-2000 (-10.16) 0.03 (7) 4 5 13 25 29 15 14 12-3000 (-15.24) 0.06 (16) 4 6 14 25 29 14 14 12-4000 (-20.32) 0.11 (28) 4 6 14 25 29 14 14 12+4000 (+20.32) 0.13 (32) 4 6 15 27 31 20 16 14+3000 (+15.24) 0.07 (18) 4 6 15 27 31 20 16 14+2000 (+10.16) 0.03 (8) 4 6 15 28 32 20 17 13+1000 (+5.08) 0.01 (2) 4 6 16 30 33 20 17 13

108 (2700) 0 (0) 0.00 (0) 4 6 16 30 34 19 16 13-1000 (-5.08) 0.01 (2) 4 6 16 31 36 18 17 14

-2000 (-10.16) 0.03 (8) 5 7 16 33 37 18 17 15-3000 (-15.24) 0.07 (18) 5 7 18 33 37 17 17 14-4000 (-20.32) 0.13 (32) 5 7 18 33 37 17 17 14


Performance Data - Model CMT/36B





applications.







SIL

EN

CE

RS

& P

AN

ELS

M-244




Performance Data - Model CMT/36E








36 (900) 0 (0) 0.00 (0) 3 5 9 14 19 20 13 10-500 (-2.54) 0.01 (2) 3 5 9 14 19 20 13 10

-1000 (-5.08) 0.02 (4) 4 5 9 15 20 20 13 10-2000 (-10.16) 0.07 (16) 4 5 10 15 20 20 13 10-3000 (-15.24) 0.15 (36) 4 5 10 15 21 20 13 9+3000 (+15.24) 0.28 (70) 5 6 12 22 34 33 20 14+2000 (+10.16) 0.12 (31) 5 6 12 23 34 33 19 13+1000 (+5.08) 0.03 (8) 5 6 13 23 34 33 19 13+500 (+2.54) 0.01 (2) 5 7 13 24 34 33 19 13

60 (1500) 0 (0) 0.00 (0) 5 7 14 25 35 33 18 12-500 (-2.54) 0.01 (2) 5 7 14 25 35 33 19 13

-1000 (-5.08) 0.03 (8) 6 7 14 26 35 33 19 13-2000 (-10.16) 0.12 (31) 6 8 15 25 35 33 19 13-3000 (-15.24) 0.28 (70) 6 9 15 26 35 33 18 12+3000 (+15.24) 0.32 (80) 6 8 17 32 47 47 26 17+2000 (+10.16) 0.14 (36) 6 9 17 33 47 47 26 17+1000 (+5.08) 0.04 (9) 7 9 17 34 47 46 25 17+500 (+2.54) 0.01 (2) 7 9 18 34 47 46 25 16

84 (2100) 0 (0) 0.00 (0) 7 9 18 35 47 46 24 15-500 (-2.54) 0.01 (2) 7 10 19 36 47 46 24 16

-1000 (-5.08) 0.04 (9) 8 10 19 37 47 47 25 15-2000 (-10.16) 0.14 (36) 8 11 19 36 47 47 24 15-3000 (-15.24) 0.32 (80) 9 12 20 37 47 47 24 14+3000 (+15.24) 0.36 (91) 8 11 21 39 47 55 32 21+2000 (+10.16) 0.16 (40) 8 11 21 39 47 55 32 21+1000 (+5.08) 0.04 (10) 8 11 22 39 47 55 31 20+500 (+2.54) 0.01 (3) 9 12 22 39 47 55 31 19

108 (2700) 0 (0) 0.00 (0) 9 12 23 39 47 55 30 17-500 (-2.54) 0.01 (3) 9 12 23 39 47 55 30 18

-1000 (-5.08) 0.04 (10) 10 13 24 39 47 55 30 18-2000 (-10.16) 0.16 (40) 11 14 24 39 47 55 29 17-3000 (-15.24) 0.36 (91) 11 15 24 39 47 55 29 16



applications.







SIL

EN

CE

RS

& P

AN

ELS

M-245








36 (900) 0 (0) 0.00 (0) 5 7 11 18 25 31 18 13-500 (-2.54) 0.02 (4) 5 7 11 19 26 30 18 14

-1000 (-5.08) 0.07 (17) 5 7 11 19 26 30 18 14-1500 (-7.62) 0.15 (36) 6 8 13 19 27 31 19 14

-2000 (-10.16) 0.27 (68) 6 8 13 20 28 30 18 13+2000 (+10.16) 0.33 (83) 6 9 15 29 47 52 29 18+1500 (+7.62) 0.19 (47) 7 9 15 30 47 52 28 18+1000 (+5.08) 0.08 (21) 7 9 16 31 47 52 28 18+500 (+2.54) 0.02 (5) 7 9 17 31 47 52 27 18

60 (1500) 0 (0) 0.00 (0) 8 10 17 32 47 53 27 16-500 (-2.54) 0.02 (5) 8 10 18 33 47 53 26 17

-1000 (-5.08) 0.08 (21) 8 11 18 33 47 53 26 16-1500 (-7.62) 0.19 (47) 9 12 18 33 47 54 26 16

-2000 (-10.16) 0.33 (83) 9 13 19 34 47 54 25 14+2000 (+10.16) 0.40 (99) 9 12 21 39 47 55 38 23+1500 (+7.62) 0.22 (55) 9 12 21 39 47 55 38 22+1000 (+5.08) 0.10 (25) 10 13 22 39 47 55 36 22+500 (+2.54) 0.02 (6) 10 13 23 39 47 55 36 22

84 (2100) 0 (0) 0.00 (0) 10 14 23 39 47 55 35 18-500 ( -2.54) 0.02 (6) 10 14 24 39 47 55 35 19-1000 (-5.08) 0.10 (25) 11 15 24 39 47 55 34 19-1500 (-7.62) 0.22 (55) 12 17 24 39 47 55 33 17

-2000 (-10.16) 0.40 (99) 13 17 24 39 47 55 32 16+2000 (+10.16) 0.46 (114) 11 15 27 39 47 55 47 28+1500 (+7.62) 0.26 (64) 11 15 27 39 47 55 47 27+1000 (+5.08) 0.11 (29) 12 16 28 39 47 55 45 26+500 (+2.54) 0.03 (7) 12 17 29 39 47 55 45 26

108 (2700) 0 (0) 0.00 (0) 13 18 29 39 47 55 43 21-500 (-2.54) 0.03 (7) 13 18 30 39 47 55 43 22

-1000 (-5.08) 0.11 (29) 14 18 31 39 47 55 42 21-1500 (-7.62) 0.26 (64) 16 21 29 39 47 55 41 19

-2000 (-10.16) 0.46 (114) 17 22 30 39 47 55 39 17


Performance Data - Model CMT/36G





applications.







SIL

EN

CE

RS

& P

AN

ELS

M-246



Absorptive Circular Film Lined SilencersCHT Series

Performance Data - Model CHT/12A








36 (900) 0 (0) 0.00 (0) 3 4 12 17 24 20 14 12-1000 (-5.08) 0.01 (1) 3 4 13 18 25 20 14 12

-2000 (-10.16) 0.02 (5) 3 5 13 18 25 20 14 11-4000 (-20.32) 0.08 (20) 4 6 14 19 26 19 12 9-6000 (-30.48) 0.17 (44) 4 6 14 19 25 18 12 8+6000 (+30.48) 0.29 (73) 4 5 15 26 35 28 21 17+4000 (+20.32) 0.13 (33) 4 6 15 26 35 27 20 18+2000 (+10.16) 0.03 (8) 4 6 16 27 35 27 19 18+1000 (+5.08) 0.01 (2) 5 6 17 28 35 27 19 17

60 (1500) 0 (0) 0.00 (0) 5 6 17 29 35 27 18 16-1000 (-5.08) 0.01 (2) 5 7 18 29 35 26 17 15

-2000 (-10.16) 0.03 (8) 5 7 19 29 35 26 17 13-4000 (-20.32) 0.13 (33) 6 9 20 26 33 24 15 10-6000 (-30.48) 0.29 (73) 7 9 20 27 33 24 14 9+6000 (+30.48) 0.41 (102) 5 6 20 37 44 36 26 23+4000 (+20.32) 0.19 (46) 6 8 20 36 44 35 25 23+2000 (+10.16) 0.05 (12) 6 8 22 38 44 34 24 23+1000 (+5.08) 0.01 (3) 6 8 22 39 44 34 23 22

84 (2100) 0 (0) 0.00 (0) 6 8 23 39 44 34 22 20-1000 (-5.08) 0.01 (3) 7 10 24 39 44 33 21 18

-2000 (-10.16) 0.05 (12) 7 9 24 39 44 32 19 15-4000 (-20.32) 0.19 (46) 8 11 25 34 40 29 18 12-6000 (-30.48) 0.41 (102) 9 12 26 34 40 29 17 10+6000 (+30.48) 0.52 (131) 6 8 25 39 44 44 32 29+4000 (+20.32) 0.24 (60) 7 10 25 39 44 42 30 29+2000 (+10.16) 0.06 (15) 7 10 27 39 44 41 28 28+1000 (+5.08) 0.02 (4) 8 10 28 39 44 40 28 27

108 (2700) 0 (0) 0.00 (0) 8 11 29 39 44 40 26 24-1000 (-5.08) 0.02 (4) 9 12 29 39 44 39 24 22

-2000 (-10.16) 0.06 (15) 9 12 30 39 44 38 22 18-4000 (-20.32) 0.24 (60) 11 14 31 39 44 35 21 14-6000 (-30.48) 0.52 (131) 12 16 32 39 44 34 20 11



applications.







SIL

EN

CE

RS

& P

AN

ELS

M-247












36 (900) 0 (0) 0.00 (0) 2 3 6 12 13 9 8 8-1000 (-5.08) 0.01 (2) 2 3 6 12 13 9 8 7

-2000 (-10.16) 0.01 (2) 2 3 6 13 14 10 9 8-4000 (-20.32) 0.03 (8) 3 4 7 13 14 11 10 10-6000 (-30.48) 0.07 (19) 4 5 8 14 14 13 12 11+6000 (+30.48) 0.12 (31) 2 3 9 18 18 12 10 9+4000 (+20.32) 0.05 (13) 2 3 9 19 18 12 10 9+2000 (+10.16) 0.01 (3) 3 3 9 20 18 12 11 11+1000 (+5.08) 0.01 (2) 3 4 10 20 17 12 11 11

60 (1500) 0 (0) 0.00 (0) 3 4 10 20 18 12 11 11-1000 (-5.08) 0.01 (2) 3 4 11 21 17 13 12 11

-2000 (-10.16) 0.01 (3) 3 5 11 21 17 13 12 11-4000 (-20.32) 0.05 (13) 4 6 11 22 17 14 13 12-6000 (-30.48) 0.12 (31) 5 7 12 22 18 15 13 12+6000 (+30.48) 0.17 (43) 2 3 12 25 23 15 13 12+4000 (+20.32) 0.07 (18) 3 4 13 27 22 15 14 13+2000 (+10.16) 0.02 (5) 3 4 13 28 22 16 15 15+1000 (+5.08) 0.01 (2) 4 5 14 28 22 15 15 15

84 (2100) 0 (0) 0.00 (0) 4 5 14 29 22 15 15 15-1000 (-5.08) 0.01 (2) 4 5 15 29 22 16 15 14

-2000 (-10.16) 0.02 (5) 4 6 15 30 21 16 15 14-4000 (-20.32) 0.07 (18) 5 7 16 30 21 17 16 15-6000 (-30.48) 0.17 (43) 6 9 17 30 21 18 15 13+6000 (+30.48) 0.22 (56) 3 4 16 33 28 18 16 15+4000 (+20.32) 0.10 (24) 3 5 17 34 27 19 17 16+2000 (+10.16) 0.02 (6) 4 5 17 36 26 19 19 19+1000 (+5.08) 0.02 (6) 4 6 18 36 26 19 18 19

108 (2700) 0 (0) 0.00 (0) 4 6 19 38 26 18 18 18-1000 (-5.08) 0.02 (6) 2 7 19 38 26 19 18 17

-2000 (-10.16) 0.02 (6) 5 7 20 38 25 19 19 17-4000 (-20.32) 0.10 (24) 6 8 21 39 24 20 18 17-6000 (-30.48) 0.22 (56) 8 10 21 38 24 20 17 14



applications.







SIL

EN

CE

RS

& P

AN

ELS

M-248

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(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(2) 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 AllLengths +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



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






63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz+6000(+30.48) 0.12(31) 1 2 6 7 6 4 4 3+4000(+20.32) 0.06(14) 1 2 6 7 6 4 4 3+2000(+10.16) 0.01(3) 1 2 5 7 6 4 4 3+1000(+5.08) 0.01(2) 2 2 5 7 6 3 4 4

36(900) 0(0) 0.00(0) 2 2 6 7 6 3 3 4-1000(-5.08) 0.01(2) 2 2 6 7 6 4 4 3

-2000(-10.16) 0.01(3) 2 3 6 7 6 4 4 3-4000(-20.32) 0.06(14) 2 2 6 7 6 4 4 3-6000(-30.48) 0.12(31) 2 2 6 7 6 4 4 3+6000(+30.48) 0.15(37) 2 3 9 12 10 8 7 5+4000(+20.32) 0.07(17) 2 3 9 12 10 8 7 5+2000(+10.16) 0.02(4) 2 3 8 12 11 8 7 5+1000(+5.08) 0.01(2) 2 3 8 12 10 7 7 6

60(1500) 0(0) 0.00(0) 2 3 9 12 10 7 7 6-1000(-5.08) 0.01(2) 2 3 9 12 10 8 7 6

-2000(-10.16) 0.02(4) 3 4 9 12 10 8 7 6-4000(-20.32) 0.07(17) 3 4 9 12 10 8 7 6-6000(-30.48) 0.15(37) 3 4 9 12 9 8 7 5+6000(+30.48) 0.17(43) 3 4 11 18 14 11 10 7+4000(+20.32) 0.08(19) 3 4 12 17 14 11 10 7+2000(+10.16) 0.02(5) 3 4 11 18 15 12 10 7+1000(+5.08) 0.01(2) 3 4 12 17 14 11 10 8

84(2100) 0(0) 0.00(0) 3 4 12 17 14 11 10 8-1000(-5.08) 0.01(2) 3 4 12 17 14 11 10 8

-2000(-10.16) 0.02(5) 4 5 12 17 13 11 11 8-4000(-20.32) 0.08(19) 4 5 12 17 13 11 10 8-6000(-30.48) 0.17(43) 4 5 12 16 12 11 10 7+6000(+30.48) 0.20(49) 4 5 14 23 18 15 13 9+4000(+20.32) 0.09(22) 4 5 15 23 18 15 14 10+2000(+10.16) 0.02(5) 4 5 14 23 19 15 14 9+1000(+5.08) 0.01(1) 3 5 15 23 18 15 14 11

108(2700) 0(0) 0.00(0) 4 5 15 22 18 16 14 9-1000(-5.08) 0.01(1) 4 5 15 22 17 15 14 11

-2000(-10.16) 0.02(5) 5 6 15 22 16 15 14 11-4000(-20.32) 0.09(22) 5 6 15 22 16 15 14 10-6000(-30.48) 0.20(49) 4 6 15 21 15 14 13 10

Performance Notes:1. Datatablesarederivedfromvaluesobtainedin

accordancewithASTME477-06a.2. “+”indicatesperformancedataforforwardflow(supply)

applications.

3. “-”indicatesperformancedataforreverseflow(return)applications.

4. DynamicInsertionLossislimitedto55dBduetoflanking.PleasecontactyourlocalPricesalesrepifinsertionlossvaluesgreaterthan55dBarerequired.

5. Generatednoisedataisbasedonafaceareaof7.07ft2.6. Theperformancedataaboveisbasedona36”diameter

component.7. Forperformancedataspecifictoasizenotcataloged,

pleaseusePriceSelectionSoftware.

Sil

en

ce

rS

28 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 Film Lined Silencers CMT, CHTGeneralFurnish and install Price Absorptive Film lined 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 e-477-06a test standard for acoustical duct silencers. laboratory performance verification may be requested in the manufacture’s test facility and a comparative test reports shall be made available to the engineer.

ConstructionSilencers shall consist of solid steel casings, perforated liners, Tedlar film, acoustic stand-off, and absorptive acoustic fiberglass media.

Connection Diameter Minimum Casing GaugeMin Max

6 20 226 44 186 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 linerAcceptable 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.

The silencer shall be provided with a thin layer of Tedlar film securely wrapped around the internal acoustic media to prevent contamination from moisture and airborne particulate that may be present in the duct system. Acoustic stand-off shall run the entire length of the internal baffles and be located between the perforated metal liner and the Tedlar film to ensure the highest level of acoustic performance.

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: 20

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 dat28 28 2/3/2009 9:11:32 AM

4. absorptive circular film lined silencers

Documents

high velocity applications

cmtcircular high velocity

medium velocity applications

ch high velocity silencer

medium velocity configuration

air velocity rangesprice

polymer film liner

high air velocities