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SOUND ATTENUATORS

WE CONTROL

NOISE

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RECTANGULAR ATTENUATORS – MODEL: PGL

CIRCULAR ATTENUATORS – MODELS: SILAX & SILAX-P

0101

SOUND ATTENUATORS

RECTANGULAR ATTENUATORS – MODEL: PGL

Ordering Key:

P G L A W HX X LRECTANGULAR SOUND

ATTENUATOR PGL MODEL

AIRWAY CODE: A,B,C,D,E OR F

SIZE: WIDTH X HEIGHT X LENGTH

CONSTRUCTION

DIMENSIONS:

- CASING: LOCK FORMED, PRE-GALVANISED STEEL SHEET OF 0.9mm THICKNESS. ALL FIXINGS ARE BY RIVETS.

- INSULATION : 2 INCH THICK ROCKWOOL FIBERS BOUND WITH THERMOSETTING BINDER FACED WITH VAPOR-RETARDANT ALUMINUM FOIL FROM ONE SIDE. AND COMPLIES WITH ASTM C612. NON COMBUSTIBLE (EN ISO 1182) 50 KG/M3 DENSITY (ASTM C303). FUNGI-RESISTANT (ASTM C665).

- FLANGES : ROLL FORMED DUCTO MATE 35mm FLANGES.

- SPLITTERS: GALVANISED SHEET. BENDED TO FORM CHANNEL SECTIONS, FIXED WITH RIVETS. PERFORATED SHEET OF 0.7MM THICKNESS IS USED TO COVER THE SPLITTERS.

0103

SOUND ATTENUATORS

RECTANGULAR ATTENUATORS – MODEL: PGL

SERIES PGLLOW PRESSURE LOSS RECTANGULAR ATTENUATORS

ATTENUATOR PERFORMANCE - AIR WAY CODE B

L e n g t h s 8 5 0 m m a n d 1 1 5 0 m mSTATIC INSERTION LOSS

2501621

5003140

1K3740

2K3136

4K2228

8K1821

OCTAVE BAND MEAN FREQUENCY (Hz)

6378

1251012

LENGTH

850

1150

HEIGHTTABLE OF VOLUME FLOW RATES (m³/s)

WIDTH (mm)

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

3000.530.710.90

1.091.271.45

1.631.811.99

2.17

6001.051.411.79

2.172.532.90

3.263.623.98

4.344.705.07

5.435.796.15

6.516.877.24

7.607.968.32

8.68

9001.572.122.68

3.263.804.34

4.885.435.97

6.517.057.60

8.148.689.22

9.7710.310.9

11.412.012.5

13.1

12002.092.823.57

4.345.075.79

6.517.247.96

8.689.4010.2

10.911.612.3

13.113.814.5

15.215.916.7

17.4

1500

3.534.47

5.436.337.24

8.149.049.95

10.911.812.7

13.614.515.4

16.317.218.1

19.019.920.8

21.7

1800

5.36

6.517.608.68

9.7710.912.0

13.114.115.2

16.317.418.5

19.620.621.7

22.823.925.0

26.1

2100

7.608.8610.2

11.412.714.0

15.216.517.8

19.020.321.6

22.824.125.3

26.627.929.1

30.4

L e n g t h s 1 4 5 0 m m a n d 1 7 5 0 m mSTATIC INSERTION LOSS

2502530

5004650

1K5345

2K4143

4K3438

8K2427

OCTAVE BAND MEAN FREQUENCY (Hz)

6389

1251416

LENGTH

14501750

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

3000.460.630.80

0.981.141.30

1.461.621.78

1.95

6000.921.251.59

1.952.272.59

2.923.243.57

3.894.214.54

4.865.185.51

5.836.166.48

6.807.137.45

7.77

9001.381.872.38

2.923.403.89

4.374.865.35

5.836.326.80

7.297.778.26

8.759.239.72

10.210.711.2

11.7

12001.832.493.18

3.894.545.18

5.836.487.13

7.778.429.07

9.7210.411.0

11.712.313.0

13.614.314.9

15.6

1500

3.113.97

4.865.676.48

7.298.108.91

9.7210.611.4

12.213.013.8

14.615.416.2

17.017.818.7*

19.5

1800

4.76

5.836.807.77

8.759.7210.7

11.712.713.6

14.615.616.6

17.518.519.5*

20.4*21.4*

2100

6.807.949.07

10.211.412.5

13.614.815.9

17.018.219.3*

20.4*21.6*

* SEE NOTE 7

HEIGHTTABLE OF VOLUME FLOW RATES (m³/s)

WIDTH (mm)

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

3000.420.570.73

0.891.041.19

1.341.481.63

1.78

6000.841.141.45

1.782.082.37

2.672.973.26

3.563.854.15

4.454.745.04

5.345.635.93

6.226.526.82

7.11

9001.261.712.18

2.673.113.56

4.004.454.89

5.345.786.22

6.677.117.56

8.008.448.89

9.339.7810.3

10.7

12001.672.282.90

3.564.154.74

5.345.936.52

7.117.708.30

8.899.4810.1

10.711.311.9

12.513.1*13.7*

14.3*

1500

2.843.63

4.455.195.93

6.677.418.15

8.899.6310.4

11.111.912.6

13.4*14.1*

1800

4.35

5.346.227.11

8.008.899.78

10.711.612.5

13.4*14.3*

2100

6.227.268.30

9.3310.411.4

12.513.5*

* SEE NOTE 7

HEIGHT

TABLE OF VOLUME FLOW RATES (m³/s)WIDTH (mm)

L e n g t h s 2 0 5 0 m m a n d 2 3 5 0 m mSTATIC INSERTION LOSS

2503540

5005050

1K4850

2K4648

4K4347

8K3134

OCTAVE BAND MEAN FREQUENCY (Hz)

631011

1251922

LENGTH

20502350

NOTES:

1.

2.

3.

4.

5.

Tabulated volume flow rates will result at 60 Pa pressure losses for ducted

attenuators, at air density of 1.2 kg/m3

Pressure loss varies in proportion to density.

Pressure loss varies in proportion to the square of the volume flow rate.

Maximum allowable volume flow rate is 1,25* the values given in the tables,

pressure loss varying in proportion to the square of the factor.

Approximate regenerated noise levels.

Tabulated values apply to attenuators ducted both sides. For pelnum entry and/or

discharge the pressure loss is to be multiplied by the appropriate factor below.

Volume

7. Selection marked * are avilable only with the shorter attenuator

Length

850/1150

1450/1750

2050/2350

Plenum to

Duct

1.20

1.16

1.13

Duct to

Plenum

3.19

2.76

2.47

Plenum to

Plenum

3.38

2.92

2.60

Over 0.63 to 0.8 * Tabulated Values

Over 0.8 to 1.0 * Tabulated Values

Over 1.0 to 1.25 * Tabulated Values

30

35

40

35

40

45

Flow Rate NC A-Scale

6.

SERIES PGLLOW PRESSURE LOSS RECTANGULAR ATTENUATORS

ATTENUATOR PERFORMANCE - AIR WAY CODE A

STATIC INSERTION LOSS

2504044

5005050

1K5050

2K4546

4K4346

8K4143

OCTAVE BAND MEAN FREQUENCY (Hz)

631213

1252326

LENGTH

20502350

L e n g t h s 2 0 5 0 m m a n d 2 3 5 0 m m

L e n g t h s 8 5 0 m m a n d 1 1 5 0 m mSTATIC INSERTION LOSS

2501924

5003341

1K3841

2K3539

4K2733

8K2327

OCTAVE BAND MEAN FREQUENCY (Hz)

6378

1251114

LENGTH

850

1150

STATIC INSERTION LOSS

L e n g t h s 1 4 5 0 m m a n d 1 7 5 0 m m

2502935

5004650

1K4446

2K4244

4K3739

8K3135

OCTAVE BAND MEAN FREQUENCY (Hz)

639

10

1251720

LENGTH

14501750

TABLE OF VOLUME FLOW RATES (m³/s)WIDTH (mm)

TABLE OF VOLUME FLOW RATES (m³/s)WIDTH (mm)

HEIGHT

* SEE NOTE 7

*SEE NOTE 7

NOTES:

1.

2.

3.

4.

5.

Tabulated volume flow rates will result at 60 Pa pressure losses for ducted

attenuators, at air density of 1.2 kg/m3

Pressure loss varies in proportion to density.

Pressure loss varies in proportion to the square of the volume flow rate.

Maximum allowable volume flow rate is 1,25* the values given in the tables,

pressure loss varying in proportion to the square of the factor.

Approximate regenerated noise levels.

Tabulated values apply to attenuators ducted both sides. For pelnum entry and/or

discharge the pressure loss is to be multiplied by the appropriate factor below.

Volume

Length

850/1150

1450/1750

2050/2350

Plenum to

Duct

1.15

1.13

1.10

Duct to

Plenum

2.78

2.51

2.26

Plenum to

Plenum

3.03

2.63

2.60

Over 0.63 to 0.8 * Tabulated Values

Over 0.8 to 1.0 * Tabulated Values

Over 1.0 to 1.25 * Tabulated Values

30

35

40

35

40

45

Flow Rate NC A-Scale

6.

(mm)300400500

600

700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

HEIGHTTABLE OF VOLUME FLOW RATES (m³/s)

WIDTH (mm)

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

2750.380.510.65

0.790.921.05

1.181.311.44

5500.761.021.29

1.571.832.09

2.352.622.88

3.143.403.66

3.924.184.44

4.704.975.23

5.495.75

8251.141.531.94

2.352.753.14

3.533.924.31

4.705.105.49

5.886.276.66

7.057.457.84

8.238.629.01

9.40

11001.522.042.58

3.143.664.18

4.705.235.75

6.276.797.32

7.848.368.88

9.409.9310.5

11.011.512.1

12.6

1375

2.553.23

3.924.575.23

5.886.537.18

7.848.499.14

9.8010.511.1

11.812.413.1

13.714.415.1

15.7

1650

3.87

4.705.496.27

7.057.848.62

9.4010.211.0

11.812.613.4

14.114.915.7

16.517.318.1

18.8

1925

4.52

5.496.407.32

8.239.1410.1

11.011.912.8

13.714.715.6

16.517.418.3

19.220.121.1

22.0

2200

6.277.328.36

9.4010.511.5

12.613.614.7

15.716.817.8

18.819.920.9

22.023.024.1

25.1*

2750.340.460.58

0.71

0.820.94

1.061.171.29

5500.680.911.16

1.41

1.641.88

2.112.352.58

2.813.053.28

3.523.753.98

4.224.454.69

4.925.16

8251.011.371.73

2.11

2.462.81

3.163.523.87

4.224.574.92

5.275.625.97

6.336.687.03

7.387.738.08

8.43

11001.351.822.31

2.81

3.283.75

4.224.695.16

5.626.096.56

7.037.507.96

8.438.909.37

9.8410.310.8

11.3

1375

2.282.89

3.52

4.104.69

5.275.866.44

7.037.618.20

8.789.379.96

10.611.211.7

12.312.913.5

14.1

1650

3.47

4.22

4.925.62

6.337.037.73

8.439.149.84

10.611.312.0

12.713.414.1

14.8*15.5*16.2*

16.9*

1925

4.04

4.92

5.746.56

7.388.209.02

9.8410.711.5

12.313.214.0

14.8*15.6*16.4*

17.2*

2200

5.62

6.567.50

8.439.3710.3

11.312.213.2

14.115.0*16.0*

16.9*

HEIGHT

(mm)

300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

275

0.310.420.53

0.650.750.86

0.971.071.18

550

0.620.831.06

1.291.501.71

1.932.142.36

2.572.783.00

3.213.433.64

3.854.074.28

4.494.71

825

0.921.251.58

1.932.252.57

2.893.213.53

3.854.174.49

4.825.145.46

5.786.106.42

6.747.067.38

7.70

1100

1.231.662.11

2.573.003.43

3.584.284.71

5.145.565.99

6.426.857.27

7.708.138.56

8.999.419.84

10.3*

1375

2.082.63

3.213.754.28

4.825.355.88

6.426.957.49

8.028.569.09

9.63*10.2*10.7*

11.3*

1650

3.16

3.854.495.14

5.786.427.06

7.708.348.99

9.6310.3*10.9*

1925

3.69

4.495.245.99

6.747.498.24

8.999.7310.5*

11.3*

2200

5.145.996.85

7.708.569.41

10.3*11.2*

0102

RECTANGULAR ATTENUATORS – MODEL: PGL

SOUND ATTENUATORS

7. Selection marked * are available only with the shorter attenuator

0103

SOUND ATTENUATORS

RECTANGULAR ATTENUATORS – MODEL: PGL

SERIES PGLLOW PRESSURE LOSS RECTANGULAR ATTENUATORS

ATTENUATOR PERFORMANCE - AIR WAY CODE B

L e n g t h s 8 5 0 m m a n d 1 1 5 0 m mSTATIC INSERTION LOSS

2501621

5003140

1K3740

2K3136

4K2228

8K1821

OCTAVE BAND MEAN FREQUENCY (Hz)

6378

1251012

LENGTH

850

1150

HEIGHTTABLE OF VOLUME FLOW RATES (m³/s)

WIDTH (mm)

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

3000.530.710.90

1.091.271.45

1.631.811.99

2.17

6001.051.411.79

2.172.532.90

3.263.623.98

4.344.705.07

5.435.796.15

6.516.877.24

7.607.968.32

8.68

9001.572.122.68

3.263.804.34

4.885.435.97

6.517.057.60

8.148.689.22

9.7710.310.9

11.412.012.5

13.1

12002.092.823.57

4.345.075.79

6.517.247.96

8.689.4010.2

10.911.612.3

13.113.814.5

15.215.916.7

17.4

1500

3.534.47

5.436.337.24

8.149.049.95

10.911.812.7

13.614.515.4

16.317.218.1

19.019.920.8

21.7

1800

5.36

6.517.608.68

9.7710.912.0

13.114.115.2

16.317.418.5

19.620.621.7

22.823.925.0

26.1

2100

7.608.8610.2

11.412.714.0

15.216.517.8

19.020.321.6

22.824.125.3

26.627.929.1

30.4

L e n g t h s 1 4 5 0 m m a n d 1 7 5 0 m mSTATIC INSERTION LOSS

2502530

5004650

1K5345

2K4143

4K3438

8K2427

OCTAVE BAND MEAN FREQUENCY (Hz)

6389

1251416

LENGTH

14501750

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

3000.460.630.80

0.981.141.30

1.461.621.78

1.95

6000.921.251.59

1.952.272.59

2.923.243.57

3.894.214.54

4.865.185.51

5.836.166.48

6.807.137.45

7.77

9001.381.872.38

2.923.403.89

4.374.865.35

5.836.326.80

7.297.778.26

8.759.239.72

10.210.711.2

11.7

12001.832.493.18

3.894.545.18

5.836.487.13

7.778.429.07

9.7210.411.0

11.712.313.0

13.614.314.9

15.6

1500

3.113.97

4.865.676.48

7.298.108.91

9.7210.611.4

12.213.013.8

14.615.416.2

17.017.818.7*

19.5

1800

4.76

5.836.807.77

8.759.7210.7

11.712.713.6

14.615.616.6

17.518.519.5*

20.4*21.4*

2100

6.807.949.07

10.211.412.5

13.614.815.9

17.018.219.3*

20.4*21.6*

* SEE NOTE 7

HEIGHTTABLE OF VOLUME FLOW RATES (m³/s)

WIDTH (mm)

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

3000.420.570.73

0.891.041.19

1.341.481.63

1.78

6000.841.141.45

1.782.082.37

2.672.973.26

3.563.854.15

4.454.745.04

5.345.635.93

6.226.526.82

7.11

9001.261.712.18

2.673.113.56

4.004.454.89

5.345.786.22

6.677.117.56

8.008.448.89

9.339.7810.3

10.7

12001.672.282.90

3.564.154.74

5.345.936.52

7.117.708.30

8.899.4810.1

10.711.311.9

12.513.1*13.7*

14.3*

1500

2.843.63

4.455.195.93

6.677.418.15

8.899.6310.4

11.111.912.6

13.4*14.1*

1800

4.35

5.346.227.11

8.008.899.78

10.711.612.5

13.4*14.3*

2100

6.227.268.30

9.3310.411.4

12.513.5*

* SEE NOTE 7

HEIGHT

TABLE OF VOLUME FLOW RATES (m³/s)WIDTH (mm)

L e n g t h s 2 0 5 0 m m a n d 2 3 5 0 m mSTATIC INSERTION LOSS

2503540

5005050

1K4850

2K4648

4K4347

8K3134

OCTAVE BAND MEAN FREQUENCY (Hz)

631011

1251922

LENGTH

20502350

NOTES:

1.

2.

3.

4.

5.

Tabulated volume flow rates will result at 60 Pa pressure losses for ducted

attenuators, at air density of 1.2 kg/m3

Pressure loss varies in proportion to density.

Pressure loss varies in proportion to the square of the volume flow rate.

Maximum allowable volume flow rate is 1,25* the values given in the tables,

pressure loss varying in proportion to the square of the factor.

Approximate regenerated noise levels.

Tabulated values apply to attenuators ducted both sides. For pelnum entry and/or

discharge the pressure loss is to be multiplied by the appropriate factor below.

Volume

Length

850/1150

1450/1750

2050/2350

Plenum to

Duct

1.20

1.16

1.13

Duct to

Plenum

3.19

2.76

2.47

Plenum to

Plenum

3.38

2.92

2.60

Over 0.63 to 0.8 * Tabulated Values

Over 0.8 to 1.0 * Tabulated Values

Over 1.0 to 1.25 * Tabulated Values

30

35

40

35

40

45

Flow Rate NC A-Scale

6.

SERIES PGLLOW PRESSURE LOSS RECTANGULAR ATTENUATORS

ATTENUATOR PERFORMANCE - AIR WAY CODE A

STATIC INSERTION LOSS

2504044

5005050

1K5050

2K4546

4K4346

8K4143

OCTAVE BAND MEAN FREQUENCY (Hz)

631213

1252326

LENGTH

20502350

L e n g t h s 2 0 5 0 m m a n d 2 3 5 0 m m

L e n g t h s 8 5 0 m m a n d 1 1 5 0 m mSTATIC INSERTION LOSS

2501924

5003341

1K3841

2K3539

4K2733

8K2327

OCTAVE BAND MEAN FREQUENCY (Hz)

6378

1251114

LENGTH

850

1150

STATIC INSERTION LOSS

L e n g t h s 1 4 5 0 m m a n d 1 7 5 0 m m

2502935

5004650

1K4446

2K4244

4K3739

8K3135

OCTAVE BAND MEAN FREQUENCY (Hz)

639

10

1251720

LENGTH

14501750

TABLE OF VOLUME FLOW RATES (m³/s)WIDTH (mm)

TABLE OF VOLUME FLOW RATES (m³/s)WIDTH (mm)

HEIGHT

* SEE NOTE 7

*SEE NOTE 7

NOTES:

1.

2.

3.

4.

5.

Tabulated volume flow rates will result at 60 Pa pressure losses for ducted

attenuators, at air density of 1.2 kg/m3

Pressure loss varies in proportion to density.

Pressure loss varies in proportion to the square of the volume flow rate.

Maximum allowable volume flow rate is 1,25* the values given in the tables,

pressure loss varying in proportion to the square of the factor.

Approximate regenerated noise levels.

Tabulated values apply to attenuators ducted both sides. For pelnum entry and/or

discharge the pressure loss is to be multiplied by the appropriate factor below.

Volume

7. Selection marked * are avilable only with the shorter attenuator

Length

850/1150

1450/1750

2050/2350

Plenum to

Duct

1.15

1.13

1.10

Duct to

Plenum

2.78

2.51

2.26

Plenum to

Plenum

3.03

2.63

2.60

Over 0.63 to 0.8 * Tabulated Values

Over 0.8 to 1.0 * Tabulated Values

Over 1.0 to 1.25 * Tabulated Values

30

35

40

35

40

45

Flow Rate NC A-Scale

6.

(mm)300400500

600

700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

HEIGHTTABLE OF VOLUME FLOW RATES (m³/s)

WIDTH (mm)

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

2750.380.510.65

0.790.921.05

1.181.311.44

5500.761.021.29

1.571.832.09

2.352.622.88

3.143.403.66

3.924.184.44

4.704.975.23

5.495.75

8251.141.531.94

2.352.753.14

3.533.924.31

4.705.105.49

5.886.276.66

7.057.457.84

8.238.629.01

9.40

11001.522.042.58

3.143.664.18

4.705.235.75

6.276.797.32

7.848.368.88

9.409.9310.5

11.011.512.1

12.6

1375

2.553.23

3.924.575.23

5.886.537.18

7.848.499.14

9.8010.511.1

11.812.413.1

13.714.415.1

15.7

1650

3.87

4.705.496.27

7.057.848.62

9.4010.211.0

11.812.613.4

14.114.915.7

16.517.318.1

18.8

1925

4.52

5.496.407.32

8.239.1410.1

11.011.912.8

13.714.715.6

16.517.418.3

19.220.121.1

22.0

2200

6.277.328.36

9.4010.511.5

12.613.614.7

15.716.817.8

18.819.920.9

22.023.024.1

25.1*

2750.340.460.58

0.71

0.820.94

1.061.171.29

5500.680.911.16

1.41

1.641.88

2.112.352.58

2.813.053.28

3.523.753.98

4.224.454.69

4.925.16

8251.011.371.73

2.11

2.462.81

3.163.523.87

4.224.574.92

5.275.625.97

6.336.687.03

7.387.738.08

8.43

11001.351.822.31

2.81

3.283.75

4.224.695.16

5.626.096.56

7.037.507.96

8.438.909.37

9.8410.310.8

11.3

1375

2.282.89

3.52

4.104.69

5.275.866.44

7.037.618.20

8.789.379.96

10.611.211.7

12.312.913.5

14.1

1650

3.47

4.22

4.925.62

6.337.037.73

8.439.149.84

10.611.312.0

12.713.414.1

14.8*15.5*16.2*

16.9*

1925

4.04

4.92

5.746.56

7.388.209.02

9.8410.711.5

12.313.214.0

14.8*15.6*16.4*

17.2*

2200

5.62

6.567.50

8.439.3710.3

11.312.213.2

14.115.0*16.0*

16.9*

HEIGHT

(mm)

300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

275

0.310.420.53

0.650.750.86

0.971.071.18

550

0.620.831.06

1.291.501.71

1.932.142.36

2.572.783.00

3.213.433.64

3.854.074.28

4.494.71

825

0.921.251.58

1.932.252.57

2.893.213.53

3.854.174.49

4.825.145.46

5.786.106.42

6.747.067.38

7.70

1100

1.231.662.11

2.573.003.43

3.584.284.71

5.145.565.99

6.426.857.27

7.708.138.56

8.999.419.84

10.3*

1375

2.082.63

3.213.754.28

4.825.355.88

6.426.957.49

8.028.569.09

9.63*10.2*10.7*

11.3*

1650

3.16

3.854.495.14

5.786.427.06

7.708.348.99

9.6310.3*10.9*

1925

3.69

4.495.245.99

6.747.498.24

8.999.7310.5*

11.3*

2200

5.145.996.85

7.708.569.41

10.3*11.2*

0102

RECTANGULAR ATTENUATORS – MODEL: PGL

SOUND ATTENUATORS

7. Selection marked * are available only with the shorter attenuator

0105

SOUND ATTENUATORS

RECTANGULAR ATTENUATORS – MODEL: PGL

SERIES PGLLOW PRESSURE LOSS RECTANGULAR ATTENUATORS

ATTENUATOR PERFORMANCE - AIR WAY CODE D

NOTES:

1.

2.

3.

4.

5.

Tabulated volume flow rates will result at 60 Pa pressure losses for ducted

attenuators, at air density of 1.2 kg/m3

Pressure loss varies in proportion to density.

Pressure loss varies in proportion to the square of the volume flow rate.

Maximum allowable volume flow rate is 1,25* the values given in the tables,

pressure loss varying in proportion to the square of the factor.

Approximate regenerated noise levels.

Tabulated values apply to attenuators ducted both sides. For pelnum entry and/or

discharge the pressure loss is to be multiplied by the appropriate factor below.

Volume

7. Selection marked * are avilable only with the shorter attenuator

Length

850/1150

1450/1750

2050/2350

Plenum to

Duct

1.29

1.24

1.20

Duct to

Plenum

3.83

3.33

2.96

Plenum to

Plenum

4.10

3.54

3.15

Over 0.63 to 0.8 * Tabulated Values

Over 0.8 to 1.0 * Tabulated Values

Over 1.0 to 1.25 * Tabulated Values

30

35

40

35

40

45

Flow Rate NC A-Scale

6.

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

3500.831.131.45

1.782.072.37

2.662.963.25

3.553.844.14

7001.662.262.89

3.554.144.73

5.325.916.50

7.097.688.27

8.869.4510.1

10.711.311.9

12.413.013.6

14.2

10502.493.394.33

5.326.217.09

7.988.869.75

10.711.612.4

13.314.215.1

16.016.917.8

18.619.520.4

21.3

1400

4.525.78

7.098.279.45

10.711.913.0

14.215.416.6

17.818.920.1

21.322.523.7

24.826.027.2

28.4

1750

7.22

8.8610.411.9

13.314.816.3

17.819.220.7

22.223.725.1

26.628.129.6

31.032.534.0

35.5

2100

10.712.414.2

16.017.819.5

21.323.124.8

26.628.430.2

31.933.735.5

37.239.040.8

42.6

HEIGHTTABLE OF VOLUME FLOW RATES (m³/s)

WIDTH (mm)

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

3500.741.011.30

1.611.882.14

2.412.682.95

3.213.483.75

7001.472.022.60

3.213.754.28

4.825.355.89

6.426.967.49

8.035.569.10

9.6310.210.7

11.311.812.5

12.9

10502.213.033.89

4.825.626.42

7.238.038.83

9.6310.511.3

12.112.913.7

14.515.316.1

16.917.718.5

19.3

1400

4.045.19

6.427.498.56

9.6310.711.8

12.914.015.0

16.117.218.2

19.320.421.4

22.523.624.7

25.7

1750

6.49

8.039.3710.7

12.113.414.8

16.117.418.8

20.121.422.8

24.125.526.8*

28.1*29.5*30.8*

2100

9.6311.312.9

14.516.117.7

19.320.922.5

24.125.727.3*

28.9*30.5*

HEIGHTTABLE OF VOLUME FLOW RATES (m³/s)

WIDTH (mm)

*SEE NOTE 7

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

3500.680.931.20

1.481.731.97

2.222.462.71

2.963.203.45

7001.351.862.39

2.963.453.94

4.434.925.41

5.916.406.89

7.387.878.37

8.869.359.84

10.410.911.4

11.8

10502.032.783.58

4.435.175.91

6.647.388.12

8.869.6010.4

11.111.812.6

13.314.114.8

15.516.317.0

17.7

1400

3.714.77

5.916.897.87

8.869.8410.9

11.812.813.8

14.815.816.8

17.728.7*19.7*

1750

5.96

7.388.619.84

11.112.313.6

14.816.017.3

18.5*19.7*

2100

8.8610.411.8

13.314.816.3

17.719.2*

*SEE NOTE 7

HEIGHTTABLE OF VOLUME FLOW RATES (m³/s)

WIDTH (mm)

L e n g t h s 8 5 0 m m a n d 1 1 5 0 m mSTATIC INSERTION LOSS

2501418

5002231

1K3034

2K2328

4K1519

8K1213

OCTAVE BAND MEAN FREQUENCY (Hz)

6366

12579

LENGTH

850

1150

L e n g t h s 1 4 5 0 m m a n d 1 7 5 0 m mSTATIC INSERTION LOSS

2502125

5003944

1K3943

2K3438

4K2429

8K1517

OCTAVE BAND MEAN FREQUENCY (Hz)

6377

1251114

LENGTH

14501750

L e n g t h s 2 0 5 0 m m a n d 2 3 5 0 m mSTATIC INSERTION LOSS

2503034

5004850

1K4648

2K4246

4K3439

8K2022

OCTAVE BAND MEAN FREQUENCY (Hz)

6389

1251619

LENGTH

20502350

SERIES PGLLOW PRESSURE LOSS RECTANGULAR ATTENUATORS

ATTENUATOR PERFORMANCE - AIR WAY CODE C

0104

RECTANGULAR ATTENUATORS – MODEL: PGL

SOUND ATTENUATORS

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

3250.670.911.16

1.421.651.89

2.122.362.59

2.833.06

6501.331.812.31

2.833.303.77

4.244.715.18

5.656.126.59

7.077.548.01

8.488.959.42

9.8910.410.9

11.3

9752.002.723.46

4.244.955.65

6.367.077.77

8.489.189.89

10.611.312.0

12.813.514.2

14.915.616.3

17.0

1300

3.624.61

5.656.597.54

8.489.4210.4

11.312.313.2

14.215.116.0

17.017.918.9

19.820.821.7

22.6

1625

5.77

7.078.249.42

10.611.813.0

14.215.316.5

17.718.920.0

21.222.423.6

24.825.927.1

28.3

1950

6.92

8.489.8911.3

12.814.215.6

17.018.419.8

21.222.624.0

25.526.928.3

29.731.132.5

33.9

2275

9.8911.613.2

14.916.518.2

19.821.523.1

24.826.428.1

29.731.333.0

34.636.337.9*

39.6*

HEIGHTTABLE OF VOLUME FLOW RATES (m³/s)

WIDTH (mm)

L e n g t h s 8 5 0 m m a n d 1 1 5 0 m mSTATIC INSERTION LOSS

8K1516

OCTAVE BAND MEAN FREQUENCY (Hz)LENGTH

2501519

5002635

1K3237

2K2732

4K1824

6367

1259

10

850

1150

L e n g t h s 1 4 5 0 m m a n d 1 7 5 0 m mSTATIC INSERTION LOSS

2502328

5004246

1K4143

2K3741

4K2833

8K1921

OCTAVE BAND MEAN FREQUENCY (Hz)

6378

1251215

LENGTH

14501750

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

3250.600.821.04

1.281.491.70

1.911.122.33

2.552.76

6501.201.632.08

2.552.973.39

3.824.244.67

5.095.515.94

6.366.787.21

7.638.068.48

8.909.339.75

10.2

9751.792.443.11

3.824.455.09

5.736.367.00

7.638.278.90

9.5410.210.8

11.512.112.8

13.414.014.7

15.3

1300

3.254.15

5.095.946.78

7.638.489.33

10.211.111.9

12.813.614.4

15.316.117.0

17.818.719.5

20.4

1625

5.18

6.367.428.48

9.5410.611.7

12.813.814.9

15.917.018.1

19.120.221.2

22.323.324.4*

25.5*

1950

6.22

7.638.9010.2

11.512.814.0

15.310.617.8

19.120.421.7

22.9*24.2*25.5

26.7*

2275

8.9010.411.9

13.414.916.4

17.819.320.8

22.323.8*25.3*

26.7*

HEIGHTTABLE OF VOLUME FLOW RATES (m³/s)

WIDTH (mm)

* SEE NOTE 7

L e n g t h s 2 0 5 0 m m a n d 2 3 5 0 m mSTATIC INSERTION LOSS

2503237

5005050

1K4750

2K4447

4K3844

8K2428

OCTAVE BAND MEAN FREQUENCY (Hz)

6378

1259

10

LENGTH

20502350

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

3250.540.540.95

1.171.361.56

1.751.952.14

2.342.53

6501.081.481.89

2.342.723.11

3.503.894.28

4.675.065.44

5.836.226.61

7.007.397.77

8.168.558.94

9.33

9751.622.22.84

3.504.084.67

5.255.836.41

7.007.588.16

8.759.339.91

10.511.111.7

12.312.913.4

14.0

1300

2.953.78

4.675.446.22

7.007.778.55

9.3310.110.9

11.712.513.3

14.014.815.6*

16.4*17.1*

1625

4.73

5.836.807.77

8.759.7210.7

11.712.713.6

14.615.6*16.6*

17.5*

1950

5.67

7.008.169.33

10.511.712.9

14.015.216.4*

17.5*

2275

8.169.5210.9

12.313.615.0

16.4*

HEIGHT

TABLE OF VOLUME FLOW RATES (m³/s)WIDTH (mm)

* SEE NOTE 7

NOTES:

1.

2.

3.

4.

5.

Tabulated volume flow rates will result at 60 Pa pressure losses for ducted

attenuators, at air density of 1.2 kg/m3

Pressure loss varies in proportion to density.

Pressure loss varies in proportion to the square of the volume flow rate.

Maximum allowable volume flow rate is 1,25* the values given in the tables,

pressure loss varying in proportion to the square of the factor.

Approximate regenerated noise levels.

Tabulated values apply to attenuators ducted both sides. For pelnum entry and/or

discharge the pressure loss is to be multiplied by the appropriate factor below.

Volume

Length

850/1150

1450/1750

2050/2350

Plenum to

Duct

1.25

1.20

1.17

Duct to

Plenum

3.48

3.01

2.69

Plenum to

Plenum

3.73

3.22

2.86

Over 0.63 to 0.8 * Tabulated Values

Over 0.8 to 1.0 * Tabulated Values

Over 1.0 to 1.25 * Tabulated Values

30

35

40

35

40

45

Flow Rate NC A-Scale

6.

7. Selection marked * are available only with the shorter attenuator

0105

SOUND ATTENUATORS

RECTANGULAR ATTENUATORS – MODEL: PGL

SERIES PGLLOW PRESSURE LOSS RECTANGULAR ATTENUATORS

ATTENUATOR PERFORMANCE - AIR WAY CODE D

NOTES:

1.

2.

3.

4.

5.

Tabulated volume flow rates will result at 60 Pa pressure losses for ducted

attenuators, at air density of 1.2 kg/m3

Pressure loss varies in proportion to density.

Pressure loss varies in proportion to the square of the volume flow rate.

Maximum allowable volume flow rate is 1,25* the values given in the tables,

pressure loss varying in proportion to the square of the factor.

Approximate regenerated noise levels.

Tabulated values apply to attenuators ducted both sides. For pelnum entry and/or

discharge the pressure loss is to be multiplied by the appropriate factor below.

Volume

Length

850/1150

1450/1750

2050/2350

Plenum to

Duct

1.29

1.24

1.20

Duct to

Plenum

3.83

3.33

2.96

Plenum to

Plenum

4.10

3.54

3.15

Over 0.63 to 0.8 * Tabulated Values

Over 0.8 to 1.0 * Tabulated Values

Over 1.0 to 1.25 * Tabulated Values

30

35

40

35

40

45

Flow Rate NC A-Scale

6.

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

3500.831.131.45

1.782.072.37

2.662.963.25

3.553.844.14

7001.662.262.89

3.554.144.73

5.325.916.50

7.097.688.27

8.869.4510.1

10.711.311.9

12.413.013.6

14.2

10502.493.394.33

5.326.217.09

7.988.869.75

10.711.612.4

13.314.215.1

16.016.917.8

18.619.520.4

21.3

1400

4.525.78

7.098.279.45

10.711.913.0

14.215.416.6

17.818.920.1

21.322.523.7

24.826.027.2

28.4

1750

7.22

8.8610.411.9

13.314.816.3

17.819.220.7

22.223.725.1

26.628.129.6

31.032.534.0

35.5

2100

10.712.414.2

16.017.819.5

21.323.124.8

26.628.430.2

31.933.735.5

37.239.040.8

42.6

HEIGHTTABLE OF VOLUME FLOW RATES (m³/s)

WIDTH (mm)

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

3500.741.011.30

1.611.882.14

2.412.682.95

3.213.483.75

7001.472.022.60

3.213.754.28

4.825.355.89

6.426.967.49

8.035.569.10

9.6310.210.7

11.311.812.5

12.9

10502.213.033.89

4.825.626.42

7.238.038.83

9.6310.511.3

12.112.913.7

14.515.316.1

16.917.718.5

19.3

1400

4.045.19

6.427.498.56

9.6310.711.8

12.914.015.0

16.117.218.2

19.320.421.4

22.523.624.7

25.7

1750

6.49

8.039.3710.7

12.113.414.8

16.117.418.8

20.121.422.8

24.125.526.8*

28.1*29.5*30.8*

2100

9.6311.312.9

14.516.117.7

19.320.922.5

24.125.727.3*

28.9*30.5*

HEIGHTTABLE OF VOLUME FLOW RATES (m³/s)

WIDTH (mm)

*SEE NOTE 7

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

3500.680.931.20

1.481.731.97

2.222.462.71

2.963.203.45

7001.351.862.39

2.963.453.94

4.434.925.41

5.916.406.89

7.387.878.37

8.869.359.84

10.410.911.4

11.8

10502.032.783.58

4.435.175.91

6.647.388.12

8.869.6010.4

11.111.812.6

13.314.114.8

15.516.317.0

17.7

1400

3.714.77

5.916.897.87

8.869.8410.9

11.812.813.8

14.815.816.8

17.728.7*19.7*

1750

5.96

7.388.619.84

11.112.313.6

14.816.017.3

18.5*19.7*

2100

8.8610.411.8

13.314.816.3

17.719.2*

*SEE NOTE 7

HEIGHTTABLE OF VOLUME FLOW RATES (m³/s)

WIDTH (mm)

L e n g t h s 8 5 0 m m a n d 1 1 5 0 m mSTATIC INSERTION LOSS

2501418

5002231

1K3034

2K2328

4K1519

8K1213

OCTAVE BAND MEAN FREQUENCY (Hz)

6366

12579

LENGTH

850

1150

L e n g t h s 1 4 5 0 m m a n d 1 7 5 0 m mSTATIC INSERTION LOSS

2502125

5003944

1K3943

2K3438

4K2429

8K1517

OCTAVE BAND MEAN FREQUENCY (Hz)

6377

1251114

LENGTH

14501750

L e n g t h s 2 0 5 0 m m a n d 2 3 5 0 m mSTATIC INSERTION LOSS

2503034

5004850

1K4648

2K4246

4K3439

8K2022

OCTAVE BAND MEAN FREQUENCY (Hz)

6389

1251619

LENGTH

20502350

SERIES PGLLOW PRESSURE LOSS RECTANGULAR ATTENUATORS

ATTENUATOR PERFORMANCE - AIR WAY CODE C

0104

RECTANGULAR ATTENUATORS – MODEL: PGL

SOUND ATTENUATORS

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

3250.670.911.16

1.421.651.89

2.122.362.59

2.833.06

6501.331.812.31

2.833.303.77

4.244.715.18

5.656.126.59

7.077.548.01

8.488.959.42

9.8910.410.9

11.3

9752.002.723.46

4.244.955.65

6.367.077.77

8.489.189.89

10.611.312.0

12.813.514.2

14.915.616.3

17.0

1300

3.624.61

5.656.597.54

8.489.4210.4

11.312.313.2

14.215.116.0

17.017.918.9

19.820.821.7

22.6

1625

5.77

7.078.249.42

10.611.813.0

14.215.316.5

17.718.920.0

21.222.423.6

24.825.927.1

28.3

1950

6.92

8.489.8911.3

12.814.215.6

17.018.419.8

21.222.624.0

25.526.928.3

29.731.132.5

33.9

2275

9.8911.613.2

14.916.518.2

19.821.523.1

24.826.428.1

29.731.333.0

34.636.337.9*

39.6*

HEIGHTTABLE OF VOLUME FLOW RATES (m³/s)

WIDTH (mm)

L e n g t h s 8 5 0 m m a n d 1 1 5 0 m mSTATIC INSERTION LOSS

8K1516

OCTAVE BAND MEAN FREQUENCY (Hz)LENGTH

2501519

5002635

1K3237

2K2732

4K1824

6367

1259

10

850

1150

L e n g t h s 1 4 5 0 m m a n d 1 7 5 0 m mSTATIC INSERTION LOSS

2502328

5004246

1K4143

2K3741

4K2833

8K1921

OCTAVE BAND MEAN FREQUENCY (Hz)

6378

1251215

LENGTH

14501750

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

3250.600.821.04

1.281.491.70

1.911.122.33

2.552.76

6501.201.632.08

2.552.973.39

3.824.244.67

5.095.515.94

6.366.787.21

7.638.068.48

8.909.339.75

10.2

9751.792.443.11

3.824.455.09

5.736.367.00

7.638.278.90

9.5410.210.8

11.512.112.8

13.414.014.7

15.3

1300

3.254.15

5.095.946.78

7.638.489.33

10.211.111.9

12.813.614.4

15.316.117.0

17.818.719.5

20.4

1625

5.18

6.367.428.48

9.5410.611.7

12.813.814.9

15.917.018.1

19.120.221.2

22.323.324.4*

25.5*

1950

6.22

7.638.9010.2

11.512.814.0

15.310.617.8

19.120.421.7

22.9*24.2*25.5

26.7*

2275

8.9010.411.9

13.414.916.4

17.819.320.8

22.323.8*25.3*

26.7*

HEIGHTTABLE OF VOLUME FLOW RATES (m³/s)

WIDTH (mm)

* SEE NOTE 7

L e n g t h s 2 0 5 0 m m a n d 2 3 5 0 m mSTATIC INSERTION LOSS

2503237

5005050

1K4750

2K4447

4K3844

8K2428

OCTAVE BAND MEAN FREQUENCY (Hz)

6378

1259

10

LENGTH

20502350

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

3250.540.540.95

1.171.361.56

1.751.952.14

2.342.53

6501.081.481.89

2.342.723.11

3.503.894.28

4.675.065.44

5.836.226.61

7.007.397.77

8.168.558.94

9.33

9751.622.22.84

3.504.084.67

5.255.836.41

7.007.588.16

8.759.339.91

10.511.111.7

12.312.913.4

14.0

1300

2.953.78

4.675.446.22

7.007.778.55

9.3310.110.9

11.712.513.3

14.014.815.6*

16.4*17.1*

1625

4.73

5.836.807.77

8.759.7210.7

11.712.713.6

14.615.6*16.6*

17.5*

1950

5.67

7.008.169.33

10.511.712.9

14.015.216.4*

17.5*

2275

8.169.5210.9

12.313.615.0

16.4*

HEIGHT

TABLE OF VOLUME FLOW RATES (m³/s)WIDTH (mm)

* SEE NOTE 7

NOTES:

1.

2.

3.

4.

5.

Tabulated volume flow rates will result at 60 Pa pressure losses for ducted

attenuators, at air density of 1.2 kg/m3

Pressure loss varies in proportion to density.

Pressure loss varies in proportion to the square of the volume flow rate.

Maximum allowable volume flow rate is 1,25* the values given in the tables,

pressure loss varying in proportion to the square of the factor.

Approximate regenerated noise levels.

Tabulated values apply to attenuators ducted both sides. For pelnum entry and/or

discharge the pressure loss is to be multiplied by the appropriate factor below.

Volume

7. Selection marked * are avilable only with the shorter attenuator

Length

850/1150

1450/1750

2050/2350

Plenum to

Duct

1.25

1.20

1.17

Duct to

Plenum

3.48

3.01

2.69

Plenum to

Plenum

3.73

3.22

2.86

Over 0.63 to 0.8 * Tabulated Values

Over 0.8 to 1.0 * Tabulated Values

Over 1.0 to 1.25 * Tabulated Values

30

35

40

35

40

45

Flow Rate NC A-Scale

6.

7. Selection marked * are available only with the shorter attenuator

0107

SOUND ATTENUATORS

RECTANGULAR ATTENUATORS – MODEL: PGL

SERIES PGLLOW PRESSURE LOSS RECTANGULAR ATTENUATORS

ATTENUATOR PERFORMANCE - AIR WAY CODE F

NOTES:

1.

2.

3.

4.

5.

Tabulated volume flow rates will result at 60 Pa pressure losses for ducted

attenuators, at air density of 1.2 kg/m3

Pressure loss varies in proportion to density.

Pressure loss varies in proportion to the square of the volume flow rate.

Maximum allowable volume flow rate is 1,25* the values given in the tables,

pressure loss varying in proportion to the square of the factor.

Approximate regenerated noise levels.

Tabulated values apply to attenuators ducted both sides. For pelnum entry and/or

discharge the pressure loss is to be multiplied by the appropriate factor below.

Volume

7. Selection marked * are avilable only with the shorter attenuator

Length

850/1150

1450/1750

2050/2350

Plenum to

Duct

1.40

1.34

1.31

Duct to

Plenum

4.61

4.13

3.79

Plenum to

Plenum

5.03

4.50

4.12

Over 0.63 to 0.8 * Tabulated Values

Over 0.8 to 1.0 * Tabulated Values

Over 1.0 to 1.25 * Tabulated Values

30

35

40

35

40

45

Flow Rate NC A-Scale

6.

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

4001.201.652.11

2.603.033.47

3.904.334.76

5.205.636.06

6.506.93

8002.413.294.21

5.206.066.93

7.798.669.52

10.411.312.2

13.013.914.8

15.616.517.3

18.219.119.9

20.8

12003.614.936.32

7.799.0910.4

11.713.014.3

15.616.918.2

19.520.822.1

23.424.726.0

27.328.629.9

31.2

1600

6.578.43

10.412.213.9

15.617.319.1

20.822.524.3

26.027.729.5

31.232.934.7

36.438.139.9

41.6

2000

10.6

13.015.217.3

19.521.723.8

26.028.230.3

32.534.736.8

39.041.243.3

45.547.649.8

52.0*

HEIGHT

TABLE OF VOLUME FLOW RATES (m³/s)WIDTH (mm)

4001.111.521.96

2.422.833.23

3.634.044.44

4.845.255.65

6.056.46

8002.223.043.91

4.845.656.46

7.268.078.88

9.6810.511.3

12.112.913.8

14.615.416.2

17.017.818.6

19.4

12003.324.565.86

7.268.479.68

10.912.113.3

14.615.817.0

18.219.420.6

21.823.024.2

25.426.727.9

29.1

1600

6.077.82

9.6811.312.9

14.616.217.8

19.421.022.6

24.225.827.5

29.130.732.3

33.935.5*37.1*

38.8*

2000

9.77

12.114.216.2

18.220.222.2

24.226.328.3

30.332.334.3

36.3*38.3*40.4*

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

HEIGHT

TABLE OF VOLUME FLOW RATES (m³/s)WIDTH (mm)

*SEE NOTE 7

4001.021.411.83

2.292.673.05

3.433.814.19

4.574.955.33

5.716.10

8002.042.813.66

4.575.336.10

6.867.628.38

9.149.9010.7

11.512.213.0

13.714.515.3

16.016.817.6

18.3

12003.064.225.48

6.868.009.14

10.311.512.6

13.714.916.0

17.218.319.5

20.621.722.9

24.025.2*26.3*

27.4*

1600

5.637.31

9.1410.712.2

13.715.316.8

18.319.821.4

22.924.4*25.9*

27.4

2000

9.13

11.513.415.3

17.219.121.0

22.924.8*26.7*

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

HEIGHTTABLE OF VOLUME FLOW RATES (m³/s)

WIDTH (mm)

*SEE NOTE 7

L e n g t h s 8 5 0 m m a n d 1 1 5 0 m mSTATIC INSERTION LOSS

2501216

5001824

1K2128

2K1621

4K1112

8K 7 8

OCTAVE BAND MEAN FREQUENCY (Hz)

6355

12568

LENGTH

850

1150

L e n g t h s 1 4 5 0 m m a n d 1 7 5 0 m mSTATIC INSERTION LOSS

BAND MEAN FREQUENCY (Hz)

8K 910

OCTAVELENGTH

2502023

5003035

1K3539

2K2528

4K1415

6366

1251012

14501750

L e n g t h s 2 0 5 0 m m a n d 2 3 5 0 m mSTATIC INSERTION LOSS

OCTAVE BAND MEAN FREQUENCY (Hz)LENGTH

4K1718

8K1011

2502730

5004045

1K4550

2K3236

6378

1251416

20502350

SERIES PGLLOW PRESSURE LOSS RECTANGULAR ATTENUATORS

ATTENUATOR PERFORMANCE - AIR WAY CODE E

0106

RECTANGULAR ATTENUATORS – MODEL: PGL

SOUND ATTENUATORS

NOTES:

1.

2.

3.

4.

5.

Tabulated volume flow rates will result at 60 Pa pressure losses for ducted

attenuators, at air density of 1.2 kg/m3

Pressure loss varies in proportion to density.

Pressure loss varies in proportion to the square of the volume flow rate.

Maximum allowable volume flow rate is 1,25* the values given in the tables,

pressure loss varying in proportion to the square of the factor.

Approximate regenerated noise levels.

Tabulated values apply to attenuators ducted both sides. For pelnum entry and/or

discharge the pressure loss is to be multiplied by the appropriate factor below.

Volume

Length

850/1150

1450/1750

2050/2350

Plenum to

Duct

1.35

1.28

1.25

Duct to

Plenum

4.19

3.68

3.32

Plenum to

Plenum

4.53

3.96

3.56

Over 0.63 to 0.8 * Tabulated Values

Over 0.8 to 1.0 * Tabulated Values

Over 1.0 to 1.25 * Tabulated Values

30

35

40

35

40

45

Flow Rate NC A-Scale

6.

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

3750.921.261.61

1.992.322.65

2.983.313.64

3.974.304.63

4.96

7501.842.513.22

3.974.635.29

5.956.617.27

7.938.599.25

9.9110.611.3

11.912.613.2

13.914.615.2

15.9

11252.753.764.82

5.956.947.93

8.929.9110.9

11.912.913.9

14.915.916.9

17.918.919.9

20.821.822.8

23.8

1500

5.016.43

7.939.2510.6

11.913.214.6

15.917.218.5

19.921.222.5

23.825.126.5

27.829.130.4

31.7*

1875

8.03

9.9111.613.2

14.916.618.2

19.921.523.2

24.826.528.1

29.831.4*33.1

34.7*36.4*

2250

11.913.915.9

17.919.921.8

23.825.827.8

29.831.7*33.7*

35.7*

HEIGHTTABLE OF VOLUME FLOW RATES (m³/s)

WIDTH (mm)

*SEE NOTE 7

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

3751.011.381.76

2.172.532.89

3.253.613.97

4.334.695.06

5.42

7502.022.753.52

4.335.065.78

6.507.227.94

8.669.3910.1

10.911.612.3

13.013.814.5

15.215.916.6

17.4

11253.034.135.28

6.507.588.66

9.7510.911.9

13.014.115.2

16.317.418.4

19.520.621.7

22.823.924.9

26.0

1500

5.507.04

8.6610.111.6

13.014.515.9

17.418.820.2

21.723.124.6

26.027.528.9

30.431.833.2

34.7

1875

8.80

10.912.714.5

16.318.119.9

21.723.525.3

27.128.930.7

32.534.336.1

37.939.741.5

43.3

2250

13.015.217.4

19.521.723.9

26.028.230.4

32.534.736.8

39.041.243.3

45.547.749.8

52.0*

HEIGHTTABLE OF VOLUME FLOW RATES (m³/s)

WIDTH (mm)

L e n g t h s 8 5 0 m m a n d 1 1 5 0 m mSTATIC INSERTION LOSS

2501317

5002027

1K2631

2K2025

4K1315

8K910

OCTAVE BAND MEAN FREQUENCY (Hz)

6356

12578

LENGTH

850

1150

L e n g t h s 1 4 5 0 m m a n d 1 7 5 0 m mSTATIC INSERTION LOSS

8K1213

OCTAVE BAND MEAN FREQUENCY (Hz)LENGTH

2502024

5003439

1K3740

2K2934

4K1822

6377

1251012

14501750

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

3750.841.151.49

1.852.162.46

2.773.083.3.9

3.694.004.31

4.62

7501.672.302.97

3.694.314.92

5.546.156.77

7.388.008.61

9.239.8410.5

11.111.712.3

13.013.614.2

14.8

11252.513.454.45

5.546.467.38

8.309.2310.2

11.112.013.0

13.914.815.7

16.617.618.5

19.420.321.3*

22.2*

1500

4.595.94

7.388.619.84

11.112.313.6

14.816.017.3

18.519.720.9

22.2*23.4*

1875

7.42

9.2310.812.3

13.915.416.9

18.520.021.6*

23.1*

2250

11.113.014.8

16.618.520.3

22.2*24.0*

HEIGHT

TABLE OF VOLUME FLOW RATES (m³/s)WIDTH (mm)

*SEE NOTE 7

L e n g t h s 2 0 5 0 m m a n d 2 3 5 0 m m

STATIC INSERTION LOSS

2502832

5004447

1K4550

2K3842

4K2528

8K1415

OCTAVE BAND MEAN FREQUENCY (Hz)

6378

1251517

LENGTH

20502350

7. Selection marked * are available only with the shorter attenuator

0107

SOUND ATTENUATORS

RECTANGULAR ATTENUATORS – MODEL: PGL

SERIES PGLLOW PRESSURE LOSS RECTANGULAR ATTENUATORS

ATTENUATOR PERFORMANCE - AIR WAY CODE F

NOTES:

1.

2.

3.

4.

5.

Tabulated volume flow rates will result at 60 Pa pressure losses for ducted

attenuators, at air density of 1.2 kg/m3

Pressure loss varies in proportion to density.

Pressure loss varies in proportion to the square of the volume flow rate.

Maximum allowable volume flow rate is 1,25* the values given in the tables,

pressure loss varying in proportion to the square of the factor.

Approximate regenerated noise levels.

Tabulated values apply to attenuators ducted both sides. For pelnum entry and/or

discharge the pressure loss is to be multiplied by the appropriate factor below.

Volume

Length

850/1150

1450/1750

2050/2350

Plenum to

Duct

1.40

1.34

1.31

Duct to

Plenum

4.61

4.13

3.79

Plenum to

Plenum

5.03

4.50

4.12

Over 0.63 to 0.8 * Tabulated Values

Over 0.8 to 1.0 * Tabulated Values

Over 1.0 to 1.25 * Tabulated Values

30

35

40

35

40

45

Flow Rate NC A-Scale

6.

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

4001.201.652.11

2.603.033.47

3.904.334.76

5.205.636.06

6.506.93

8002.413.294.21

5.206.066.93

7.798.669.52

10.411.312.2

13.013.914.8

15.616.517.3

18.219.119.9

20.8

12003.614.936.32

7.799.0910.4

11.713.014.3

15.616.918.2

19.520.822.1

23.424.726.0

27.328.629.9

31.2

1600

6.578.43

10.412.213.9

15.617.319.1

20.822.524.3

26.027.729.5

31.232.934.7

36.438.139.9

41.6

2000

10.6

13.015.217.3

19.521.723.8

26.028.230.3

32.534.736.8

39.041.243.3

45.547.649.8

52.0*

HEIGHT

TABLE OF VOLUME FLOW RATES (m³/s)WIDTH (mm)

4001.111.521.96

2.422.833.23

3.634.044.44

4.845.255.65

6.056.46

8002.223.043.91

4.845.656.46

7.268.078.88

9.6810.511.3

12.112.913.8

14.615.416.2

17.017.818.6

19.4

12003.324.565.86

7.268.479.68

10.912.113.3

14.615.817.0

18.219.420.6

21.823.024.2

25.426.727.9

29.1

1600

6.077.82

9.6811.312.9

14.616.217.8

19.421.022.6

24.225.827.5

29.130.732.3

33.935.5*37.1*

38.8*

2000

9.77

12.114.216.2

18.220.222.2

24.226.328.3

30.332.334.3

36.3*38.3*40.4*

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

HEIGHT

TABLE OF VOLUME FLOW RATES (m³/s)WIDTH (mm)

*SEE NOTE 7

4001.021.411.83

2.292.673.05

3.433.814.19

4.574.955.33

5.716.10

8002.042.813.66

4.575.336.10

6.867.628.38

9.149.9010.7

11.512.213.0

13.714.515.3

16.016.817.6

18.3

12003.064.225.48

6.868.009.14

10.311.512.6

13.714.916.0

17.218.319.5

20.621.722.9

24.025.2*26.3*

27.4*

1600

5.637.31

9.1410.712.2

13.715.316.8

18.319.821.4

22.924.4*25.9*

27.4

2000

9.13

11.513.415.3

17.219.121.0

22.924.8*26.7*

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

HEIGHTTABLE OF VOLUME FLOW RATES (m³/s)

WIDTH (mm)

*SEE NOTE 7

L e n g t h s 8 5 0 m m a n d 1 1 5 0 m mSTATIC INSERTION LOSS

2501216

5001824

1K2128

2K1621

4K1112

8K 7 8

OCTAVE BAND MEAN FREQUENCY (Hz)

6355

12568

LENGTH

850

1150

L e n g t h s 1 4 5 0 m m a n d 1 7 5 0 m mSTATIC INSERTION LOSS

BAND MEAN FREQUENCY (Hz)

8K 910

OCTAVELENGTH

2502023

5003035

1K3539

2K2528

4K1415

6366

1251012

14501750

L e n g t h s 2 0 5 0 m m a n d 2 3 5 0 m mSTATIC INSERTION LOSS

OCTAVE BAND MEAN FREQUENCY (Hz)LENGTH

4K1718

8K1011

2502730

5004045

1K4550

2K3236

6378

1251416

20502350

SERIES PGLLOW PRESSURE LOSS RECTANGULAR ATTENUATORS

ATTENUATOR PERFORMANCE - AIR WAY CODE E

0106

RECTANGULAR ATTENUATORS – MODEL: PGL

SOUND ATTENUATORS

NOTES:

1.

2.

3.

4.

5.

Tabulated volume flow rates will result at 60 Pa pressure losses for ducted

attenuators, at air density of 1.2 kg/m3

Pressure loss varies in proportion to density.

Pressure loss varies in proportion to the square of the volume flow rate.

Maximum allowable volume flow rate is 1,25* the values given in the tables,

pressure loss varying in proportion to the square of the factor.

Approximate regenerated noise levels.

Tabulated values apply to attenuators ducted both sides. For pelnum entry and/or

discharge the pressure loss is to be multiplied by the appropriate factor below.

Volume

7. Selection marked * are avilable only with the shorter attenuator

Length

850/1150

1450/1750

2050/2350

Plenum to

Duct

1.35

1.28

1.25

Duct to

Plenum

4.19

3.68

3.32

Plenum to

Plenum

4.53

3.96

3.56

Over 0.63 to 0.8 * Tabulated Values

Over 0.8 to 1.0 * Tabulated Values

Over 1.0 to 1.25 * Tabulated Values

30

35

40

35

40

45

Flow Rate NC A-Scale

6.

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

3750.921.261.61

1.992.322.65

2.983.313.64

3.974.304.63

4.96

7501.842.513.22

3.974.635.29

5.956.617.27

7.938.599.25

9.9110.611.3

11.912.613.2

13.914.615.2

15.9

11252.753.764.82

5.956.947.93

8.929.9110.9

11.912.913.9

14.915.916.9

17.918.919.9

20.821.822.8

23.8

1500

5.016.43

7.939.2510.6

11.913.214.6

15.917.218.5

19.921.222.5

23.825.126.5

27.829.130.4

31.7*

1875

8.03

9.9111.613.2

14.916.618.2

19.921.523.2

24.826.528.1

29.831.4*33.1

34.7*36.4*

2250

11.913.915.9

17.919.921.8

23.825.827.8

29.831.7*33.7*

35.7*

HEIGHTTABLE OF VOLUME FLOW RATES (m³/s)

WIDTH (mm)

*SEE NOTE 7

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

3751.011.381.76

2.172.532.89

3.253.613.97

4.334.695.06

5.42

7502.022.753.52

4.335.065.78

6.507.227.94

8.669.3910.1

10.911.612.3

13.013.814.5

15.215.916.6

17.4

11253.034.135.28

6.507.588.66

9.7510.911.9

13.014.115.2

16.317.418.4

19.520.621.7

22.823.924.9

26.0

1500

5.507.04

8.6610.111.6

13.014.515.9

17.418.820.2

21.723.124.6

26.027.528.9

30.431.833.2

34.7

1875

8.80

10.912.714.5

16.318.119.9

21.723.525.3

27.128.930.7

32.534.336.1

37.939.741.5

43.3

2250

13.015.217.4

19.521.723.9

26.028.230.4

32.534.736.8

39.041.243.3

45.547.749.8

52.0*

HEIGHTTABLE OF VOLUME FLOW RATES (m³/s)

WIDTH (mm)

L e n g t h s 8 5 0 m m a n d 1 1 5 0 m mSTATIC INSERTION LOSS

2501317

5002027

1K2631

2K2025

4K1315

8K910

OCTAVE BAND MEAN FREQUENCY (Hz)

6356

12578

LENGTH

850

1150

L e n g t h s 1 4 5 0 m m a n d 1 7 5 0 m mSTATIC INSERTION LOSS

8K1213

OCTAVE BAND MEAN FREQUENCY (Hz)LENGTH

2502024

5003439

1K3740

2K2934

4K1822

6377

1251012

14501750

(mm)300400500

600700800

90010001100

120013001400

150016001700

180019002000

210022002300

2400

3750.841.151.49

1.852.162.46

2.773.083.3.9

3.694.004.31

4.62

7501.672.302.97

3.694.314.92

5.546.156.77

7.388.008.61

9.239.8410.5

11.111.712.3

13.013.614.2

14.8

11252.513.454.45

5.546.467.38

8.309.2310.2

11.112.013.0

13.914.815.7

16.617.618.5

19.420.321.3*

22.2*

1500

4.595.94

7.388.619.84

11.112.313.6

14.816.017.3

18.519.720.9

22.2*23.4*

1875

7.42

9.2310.812.3

13.915.416.9

18.520.021.6*

23.1*

2250

11.113.014.8

16.618.520.3

22.2*24.0*

HEIGHT

TABLE OF VOLUME FLOW RATES (m³/s)WIDTH (mm)

*SEE NOTE 7

L e n g t h s 2 0 5 0 m m a n d 2 3 5 0 m m

STATIC INSERTION LOSS

2502832

5004447

1K4550

2K3842

4K2528

8K1415

OCTAVE BAND MEAN FREQUENCY (Hz)

6378

1251517

LENGTH

20502350

7. Selection marked * are available only with the shorter attenuator

0109

SOUND ATTENUATORS

CIRCULAR ATTENUATORS – MODELS: SILAX & SLIAX-P

315

400

500

560

630

710

800

900

1000

1120

1250

1400

1600

1800

2000

315

400

500

560

630

710

800

900

1000

1120

1250

1400

1600

1800

2000

3

3

3

3

4

4

4

4

4

4

4

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

6

6

6

6

7

7

7

7

9

9

9

10

10

10

10

11

11

11

11

11

11

11

11

16

16

16

18

18

18

18

17

17

17

17

17

17

17

17

13

13

13

17

17

17

17

16

16

16

16

16

16

16

16

16

16

16

13

13

13

13

11

11

11

11

13

13

13

13

15

15

15

11

11

11

11

9

9

9

9

12

12

12

12

10

10

10

10

10

10

10

8

8

8

8

4

5

5

5

5

5

5

5

5

5

5

6

6

-

-

6

7

7

7

8

8

8

8

8

8

8

9

9

-

-

9

10

10

10

12

12

12

14

14

14

14

15

15

-

-

14

15

15

15

21

21

21

21

21

21

21

20

20

-

-

19

20

20

20

21

21

21

20

20

20

20

20

20

-

-

16

19

19

19

21

21

21

17

17

17

17

16

16

-

-

13

17

17

17

19

19

19

15

15

15

15

12

12

-

-

12

15

15

15

13

13

13

12

12

12

12

10

10

-

-

4

6

6

6

7

7

7

7

7

7

7

8

8

8

8

7

9

9

9

10

10

10

10

10

10

10

12

12

12

12

11

14

14

14

15

15

15

17

17

17

17

19

19

19

19

17

20

20

20

25

25

25

24

24

24

24

23

23

23

23

21

24

24

24

29

29

29

24

24

24

24

24

24

24

24

17

23

23

23

26

26

26

21

21

21

21

21

21

21

21

13

20

20

20

23

23

23

18

18

18

18

14

14

14

14

12

19

19

19

16

16

16

15

15

15

15

13

13

13

13

2

2

2

2

3

3

3

3

3

3

3

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

5

5

5

5

6

6

6

6

8

8

8

9

9

9

9

10

10

10

10

10

10

10

10

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14

12

12

12

12

11

11

11

11

10

10

10

10

9

9

9

8

8

8

8

7

7

7

7

7

7

7

7

8

8

8

7

7

7

7

6

6

6

6

8

8

8

8

7

7

7

7

7

7

7

6

6

6

6

3

3

3

3

5

5

5

5

5

5

5

5

5

-

-

6

6

6

6

6

6

6

6

6

6

6

6

6

-

-

9

9

9

9

11

11

11

11

11

11

11

11

11

14

14

14

14

18

18

18

18

18

18

18

17

17

-

-

18

18

18

18

18

18

18

15

15

15

15

15

15

-

-

14

14

14

14

12

12

12

10

10

10

10

10

10

-

-

10

10

10

10

11

11

11

9

9

9

9

9

9

-

-

10

10

10

10

8

8

8

9

9

9

9

8

8

-

-

4

4

4

4

6

6

6

6

6

6

6

5

5

5

5

7

7

7

7

8

8

8

8

8

8

8

7

7

7

7

11

11

11

11

13

13

13

13

13

13

13

12

12

12

12

17

17

17

17

22

22

22

21

21

21

21

19

19

19

19

21

21

21

21

22

22

22

18

18

18

18

18

18

18

18

17

17

17

17

14

14

14

12

12

12

12

13

13

13

13

13

13

13

13

13

13

13

11

11

11

11

11

11

11

11

12

12

12

12

9

9

9

10

10

10

10

9

9

9

9

ACCUSTIC PERFORMANCE - Dynamic attenuation values in dB

FANSIZE 63 125 250 500 1k 2k 4k 8k 63 125 250 500 1k 2k 4k 8k 63 125 250 500 1k 2k 4k 8k

OCTAVE BAND MEAN FREQUENCY OCTAVE BAND MEAN FREQUENCY OCTAVE BAND MEAN FREQUENCY

SILAX (1.0 D) SILAX (1.5 D) SILAX (2 D)

FANSIZE 63 125 250 500 1k 2k 4k 8k 63 125 250 500 1k 2k 4k 8k 63 125 250 500 1k 2k 4k 8k

OCTAVE BAND MEAN FREQUENCY OCTAVE BAND MEAN FREQUENCY OCTAVE BAND MEAN FREQUENCY

SILAX - P (1.5 D)SILAX - P (1.0 D) SILAX - P (2 D)

0108

SERIES SILAX AND SILAX-P cylindrical attenuators have been designed for the purpose of reducing airborne fan noise from the inlet and/or discharge of axial flow fans. They are also suitable for installation on the inlet of centrifugal fans or in sections of ducting remote from the fans, Series SILAX and SILAX-P cylindrical attenuators are available in sizes suitable for fitting directly to all DONKIN axial flow fans.

Series SILAXSeries SILAX attenuators comprise outer casings incorporating acoustic materials retained between the casings and internal wire

mesh cylinders. Perforated steel internal cylinders have the same diameters as the nominal attenuator sizes, i.e. the size pf the fan or duct to which the attenuator is connected.

The incorporation of the central pod considerably improves the acoustic performance of the attenuator, but also creates a resistance to the flow of air. it is normal practice to select SILAX-P attenuators for a pressure loss not exceeding 60Pa.

SizesSeries SILAX and SILAX-P attenuators are available in a range of standard sizes matching all DONKIN axial flow fans from 315mm to 2000mm nominal diameter. The units are available in lengths of 1, 1.5 and 2.0 diameters. Non standard sizes will be manufactured to customer requirements.

CONSTRUCTION- Casings are constructed from pre-galvanised steel sheet in corporating lock formed seams. Standard casings are designed to with stand pressures up to 2500Pa.

- Flanges. Sizes up to and including 1000mm in diameter, incorporate spun flanges, manufactured from preglavanised steel sheet. threaded fastners are projection welded to the inside of the flanges. These flanges are primed and enamel painted prior to assembly.

- Acoustic materials. The acoustic infill in a patented sound absorbing material consisting of glass fibre material selected for the combination of density. Resilience and porosity, that achieves optimum broadband acoustic performance. This patented sound absorbing material satisfies the requirements of BS 476:Part7, class i spread of flame. Standard material limits the attenuator to be used at a maximum temperature of 80° C.- Inner Cylinder. The casing inner cylinder which retains the acoustic material is constructed from pre-galvanised perforated sheet

thickness of 0.7 mm.- Acoustic Pod (Series SILAX-P only)This pod comprises a cylinderconstructed from pre-galvanised sheet with a thiskness of 0.7 mm,to which are attached moulded fiberglass, or spun steel, fairings atboth ends, deisgned tp minimize the resistance to airflow. The pod is filled internally with patented acoustic material.

PERFORMANCE- Acoustic Performance. Dynamic Attenuation values are derived from tests conducted in accordance with BS 848. The Dynamic Attenuation values constitute the numerical difference between the sound power level of the fan with the attenuator replaced by a straight duct of equivalent length to the attenuator.

- Aerodynamic Performance. The pressure loss of Series SILAX attenuators can be considered as negligible for the range of velocities normally encountered in ventilation and air-conditioning systems. The pressure loss versus volume for the range of SILAX-P attenuators is illustrated graphically in this brochure. The pressure loss values are derived from tests conducted in accordance withBS 848, and are equal to the difference in fan performance resulting from the attachment of the attenuator.

OPTIONAL FEATURESVarious optional extras are available including;• Counter flanges.• Mounting feet.• Inlet cones & inlet cone Screens or standard screens• Special Paint Finishes.• Heavy Welded Construction for high pressures or rigorous industrial or mining applications.• High temperature construction i.e. above 80° C.• Melines / clean seal avialable for special / hospital applications.

All technical information contained herein is subject to changewithout prior notice.

equivalent size of DONKIN axial flow fans. Series SILAX

CIRCULAR ATTENUATORS – MODELS: SILAX & SILAX-P

SOUND ATTENUATORS

of air.

Series SILAX attenuators fit directly to the fans or ducts, by bolting to threaded fasteners integral with the attenuator flanges. The positions of these fasteners correspond to the flange drilling of the

attenuators cause a negligible resistance to the flow

Series SILAX-P

Series SILAX-P attenuators contain centrally mounted, cylindrical acoustic pods. The outer sections of the attenuators are identical to the Series SILAX attenuators. Removal of the pod from the SILAX-P attenuator converts the attenuator to a SILAX unit.

0109

315

400

500

560

630

710

800

900

1000

1120

1250

1400

1600

1800

2000

315

400

500

560

630

710

800

900

1000

1120

1250

1400

1600

1800

2000

3

3

3

3

4

4

4

4

4

4

4

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

6

6

6

6

7

7

7

7

9

9

9

10

10

10

10

11

11

11

11

11

11

11

11

16

16

16

18

18

18

18

17

17

17

17

17

17

17

17

13

13

13

17

17

17

17

16

16

16

16

16

16

16

16

16

16

16

13

13

13

13

11

11

11

11

13

13

13

13

15

15

15

11

11

11

11

9

9

9

9

12

12

12

12

10

10

10

10

10

10

10

8

8

8

8

4

5

5

5

5

5

5

5

5

5

5

6

6

-

-

6

7

7

7

8

8

8

8

8

8

8

9

9

-

-

9

10

10

10

12

12

12

14

14

14

14

15

15

-

-

14

15

15

15

21

21

21

21

21

21

21

20

20

-

-

19

20

20

20

21

21

21

20

20

20

20

20

20

-

-

16

19

19

19

21

21

21

17

17

17

17

16

16

-

-

13

17

17

17

19

19

19

15

15

15

15

12

12

-

-

12

15

15

15

13

13

13

12

12

12

12

10

10

-

-

4

6

6

6

7

7

7

7

7

7

7

8

8

8

8

7

9

9

9

10

10

10

10

10

10

10

12

12

12

12

11

14

14

14

15

15

15

17

17

17

17

19

19

19

19

17

20

20

20

25

25

25

24

24

24

24

23

23

23

23

21

24

24

24

29

29

29

24

24

24

24

24

24

24

24

17

23

23

23

26

26

26

21

21

21

21

21

21

21

21

13

20

20

20

23

23

23

18

18

18

18

14

14

14

14

12

19

19

19

16

16

16

15

15

15

15

13

13

13

13

2

2

2

2

3

3

3

3

3

3

3

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

5

5

5

5

6

6

6

6

8

8

8

9

9

9

9

10

10

10

10

10

10

10

10

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14

12

12

12

12

11

11

11

11

10

10

10

10

9

9

9

8

8

8

8

7

7

7

7

7

7

7

7

8

8

8

7

7

7

7

6

6

6

6

8

8

8

8

7

7

7

7

7

7

7

6

6

6

6

3

3

3

3

5

5

5

5

5

5

5

5

5

-

-

6

6

6

6

6

6

6

6

6

6

6

6

6

-

-

9

9

9

9

11

11

11

11

11

11

11

11

11

14

14

14

14

18

18

18

18

18

18

18

17

17

-

-

18

18

18

18

18

18

18

15

15

15

15

15

15

-

-

14

14

14

14

12

12

12

10

10

10

10

10

10

-

-

10

10

10

10

11

11

11

9

9

9

9

9

9

-

-

10

10

10

10

8

8

8

9

9

9

9

8

8

-

-

4

4

4

4

6

6

6

6

6

6

6

5

5

5

5

7

7

7

7

8

8

8

8

8

8

8

7

7

7

7

11

11

11

11

13

13

13

13

13

13

13

12

12

12

12

17

17

17

17

22

22

22

21

21

21

21

19

19

19

19

21

21

21

21

22

22

22

18

18

18

18

18

18

18

18

17

17

17

17

14

14

14

12

12

12

12

13

13

13

13

13

13

13

13

13

13

13

11

11

11

11

11

11

11

11

12

12

12

12

9

9

9

10

10

10

10

9

9

9

9

ACCUSTIC PERFORMANCE - Dynamic attenuation values in dB

FANSIZE 63 125 250 500 1k 2k 4k 8k 63 125 250 500 1k 2k 4k 8k 63 125 250 500 1k 2k 4k 8k

OCTAVE BAND MEAN FREQUENCY OCTAVE BAND MEAN FREQUENCY OCTAVE BAND MEAN FREQUENCY

SILAX (1.0 D) SILAX (1.5 D) SILAX (2 D)

FANSIZE 63 125 250 500 1k 2k 4k 8k 63 125 250 500 1k 2k 4k 8k 63 125 250 500 1k 2k 4k 8k

OCTAVE BAND MEAN FREQUENCY OCTAVE BAND MEAN FREQUENCY OCTAVE BAND MEAN FREQUENCY

SILAX - P (1.5 D)SILAX - P (1.0 D) SILAX - P (2 D)

0108

CIRCULAR ATTENUATORS – MODELS: SILAX & SLIAX-P

SOUND ATTENUATORS

SERIES SILAX AND SILAX-P cylindrical attenuators have been designed for the purpose of reducing airborne fan noise from the inlet and/or discharge of axial flow fans. They are also suitable for installation on the inlet of centrifugal fans or in sections of ducting remote from the fans, Series SILAX and SILAX-P cylindrical attenuators are available in sizes suitable for fitting directly to all DONKIN axial flow fans.

Series SILAXSeries SILAX attenuators comprise outer casings incorporating acoustic materials retained between the casings and internal wire

mesh cylinders. Perforated steel internal cylinders have the same diameters as the nominal attenuator sizes, i.e. the size pf the fan or duct to which the attenuator is connected.

Series SILAX attenuators fit directly to the fans or ducts, by bolting to threaded fasteners integral with the attenuator flanges. Thepositions of these fasteners correspond to the flange drilling of the equivalent size of DONKIN axial flow fans. Series SILAX attenuators cause a neglibible resistance to the flow of air.

Series SILAX-PSeries SILAX-P attenuators contain cemtrally mounted, cylindrical acoustic pods. The outer sections of the attenuators are identical to the Series SILAX attenuators. Removal of the pod from the SILAX-P attenuator converts the attenuator to a SILAX unit.

The incorporation of the central pod considerably improves the acoustic performance of the attenuator, but also creates a resistance to the flow of air. it is normal practice to select SILAX-P attenuators for a pressure loss not exceeding 60Pa.

SizesSeries SILAX and SILAX-P attenuators are available in a range of standard sizes matching all DONKIN axial flow fans from 315mm to 2000mm nominal diameter. The units are available in lengths of 1, 1.5 and 2.0 diameters. Non standard sizes will be manufactured to customer requirements.

CONSTRUCTION- Casings are constructed from pre-galvanised steel sheet in corporating lock formed seams. Standard casings are designed to with stand pressures up to 2500Pa.

- Flanges. Sizes up to and including 1000mm in diameter, incorporate spun flanges, manufactured from preglavanised steel sheet. threaded fastners are projection welded to the inside of the flanges. These flanges are primed and enamel painted prior to assembly.

- Acoustic materials. The acoustic infill in a patented sound absorbing material consisting of glass fibre material selected for the combination of density. Resilience and porosity, that achieves optimum broadband acoustic performance. This patented sound absorbing material satisfies the requirements of BS 476:Part7, class i spread of flame. Standard material limits the attenuator to be used at a maximum temperature of 80° C.- Inner Cylinder. The casing inner cylinder which retains the acoustic material is constructed from pre-galvanised perforated sheet

thickness of 0.7 mm.- Acoustic Pod (Series SILAX-P only)This pod comprises a cylinderconstructed from pre-galvanised sheet with a thiskness of 0.7 mm,to which are attached moulded fiberglass, or spun steel, fairings atboth ends, deisgned tp minimize the resistance to airflow. The pod is filled internally with patented acoustic material.

PERFORMANCE- Acoustic Performance. Dynamic Attenuation values are derived from tests conducted in accordance with BS 848. The Dynamic Attenuation values constitute the numerical difference between the sound power level of the fan with the attenuator replaced by a straight duct of equivalent length to the attenuator.

- Aerodynamic Performance. The pressure loss of Series SILAX attenuators can be considered as negligible for the range of velocities normally encountered in ventilation and air-conditioning systems. The pressure loss versus volume for the range of SILAX-P attenuators is illustrated graphically in this brochure. The pressure loss values are derived from tests conducted in accordance withBS 848, and are equal to the difference in fan performance resulting from the attachment of the attenuator.

OPTIONAL FEATURESVarious optional extras are available including;• Counter flanges.• Mounting feet.• Inlet cones & inlet cone Screens or standard screens• Special Paint Finishes.• Heavy Welded Construction for high pressures or rigorous industrial or mining applications.• High temperature construction i.e. above 80° C.• Melines / clean seal avialable for special / hospital applications.

All technical information contained herein is subject to changewithout prior notice.

SOUND ATTENUATORS

CIRCULAR ATTENUATORS – MODELS: SILAX & SILAX-P

0110

315

400

500

560

630

710

800

900

1000

1120

1250

1400

1600

1800

2000

315

400

500

560

630

710

800

900

1000

1120

1250

1400

1600

1800

2000

475

600

750

840

945

1065

1200

1350

1500

1680

1875

2100

2400

-

-

630

800

1000

1120

1260

1420

1600

1800

2000

2240

2500

2800

3200

-

-

467

552

692

752

822

902

992

1092

1192

1312

1442

1592

1840

2043

2243

315

400

500

560

630

710

800

900

1000

1120

1250

1400

1600

1800

2000

8

8

12

12

12

16

16

16

16

20

20

20

24

24

24

8

10

10

10

10

10

10

12

12

12

12

12

16

16

16

355

450

560

620

690

770

860

970

1070

1190

1320

1470

1680

1880

2080

10

14

23

27

32

44

54

68

83

140

162

222

322

390

470

13

20

31

38

36

62

76

97

119

189

226

313

446

-

-

20

28

46

54

64

88

108

136

166

280

324

444

644

-

-

13

19

31

38

44

58

73

91

114

183

211

290

401

481

598

19

27

43

54

54

84

107

119

167

255

301

418

579

-

-

26

38

62

76

88

116

146

182

228

366

422

580

802

-

-

FANDia.mm

A1Dmm

A1.5Dmm

A2Dmm

B

mm

C

mm

D E

mm

F

mm

Silax1Dkg

Silax1.5Dkg

Silax2Dkg

Silax-P1Dkg

Silax-P1.5Dkg

Silax-P2Dkg

SILAX & SILAX-P CIRCULAR ATTENUATORS

DIMENSIONS & MASSES

CIRCULAR ATTENUATORS – MODELS: SILAX & SILAX-P

SOUND ATTENUATORS