Type CA

For the reduction of noise in circular ducts, galvanised sheet steel construction

Circular silencers Type CA for the reduction of noise in the circular ducts of air conditioning systems

  • Absorption material is non-combustible mineral wool with RAL quality mark, biosoluble and hence hygienically safe according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EC
  • Mineral wool faced with non-woven glass fibre as protection against erosion due to airflow velocities up to 20 m/s
  • Casing and perforated inner duct are galvanised sheet steel
  • Variant with spigot has a groove for a lip seal, suitable for circular connecting ducts to EN 1506 or EN 13180
  • Insertion loss measured according to ISO 7235
  • Casing air leakage to EN 15727, class B

Optional equipment and accessories

  • With flanges on both ends
  • With lip seals on both ends

Circular silencer Type CA 00131776_0


  • Application
  • Description

Application

  • Circular silencers Type CA for the reduction of noise in the circular ducts of air conditioning systems
  • For the reduction of air-regenerated noise of air terminal units such as LVC and TVR, and of mechanical self-powered controllers such as RN and VFC
  • For the reduction of fan noise
  • Can be used as cross talk silencer to reduce the transfer of noise through ducts between neighbouring rooms

Special features

  • Insertion loss measured according to ISO 7235
  • Absorption material is non-combustible
  • Insulation thickness 50 mm or 100 mm

Nominal sizes

  • 100, 125, 160, 200, 250, 315, 400, 450, 500, 560, 630, 710, 800 mm

For VAV terminal units and CAV controllers

  • 100, 125, 160, 200, 250, 315, 400 mm

Variants

  • 050: Circular silencer with 50 mm insulation
  • 100: Circular silencer with 100 mm insulation
  • VF1: Circular silencer with flange on one end
  • VF2: Circular silencer with flanges on both ends

Parts and characteristics

  • Casing
  • Perforated inner tube
  • Absorption material

Accessories

  • GE: Matching flange for one end
  • GZ: Matching flanges for both ends
  • VD2: With lip seals on both ends

Construction features

  • Circular casing
  • Spigot suitable for circular ducts to EN 1506 or EN 13180
  • Spigot with groove for lip seal
  • Operating pressure up to 1000 Pa
  • Operating temperature up to 100 °C

Materials and surfaces

  • Casing and perforated inner duct are galvanised sheet steel
  • Lining is mineral wool


Mineral wool

  • To EN 13501, fire rating class A1, non-combustible
  • RAL quality mark RAL-GZ 388
  • Biosoluble and hence hygienically safe according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EC
  • Faced with glass fibre as protection against erosion through airflow velocities up to 20 m/s
  • Inert to fungal and bacterial growth

Standards and guidelines

  • Insertion loss measured according to ISO 7235
  • Casing air leakage to EN 15727, class B

Maintenance

  • Maintenance-free as construction and materials are not subject to wear

Technical information

Technical data, Quick sizing, Specification text, Order code, Produktbeziehungen

  • Technical data
  • Quick sizing
  • Specification text
  • Order code

Nominal sizes

100 – 800 mm

Operating pressure

1000 Pa max.

Operating temperature

100 °C max.


The stated differential pressures for circular silencers correspond to the values for smooth pipes. Deviations, if any, are of no practical relevance.

For ductwork calculation, if the length of a circular silencer is included in the total length of the ductwork, no extra length must be added.

CA050 (insulation thickness 50 mm), insertion loss

Nominal size Nominal length Centre frequency fm [Hz]
Nominal size Nominal length 63 125 250 500 1000 2000 4000 8000
Nominal size Nominal length De
Nominal size mm Hz

100

500

3

5

8

14

23

30

18

13

100

1000

4

9

15

27

42

50

43

25

125

500

3

4

7

12

21

23

12

10

125

1000

4

7

12

23

38

42

29

20

160

500

2

3

6

10

18

17

8

8

160

1000

3

5

9

19

34

30

18

15

200

500

1

2

5

9

16

13

5

6

200

1000

2

4

8

16

31

22

12

11

250

500

1

2

4

8

14

10

3

4

250

1000

2

3

6

14

28

17

8

9

250

1500

2

4

8

19

39

23

13

12

315

500

1

1

3

7

12

7

2

3

315

1000

1

2

5

12

25

13

5

6

315

1500

2

3

7

17

35

17

9

9

400

500

1

1

3

6

11

6

1

2

400

1000

1

2

4

10

22

10

3

5

400

1500

1

2

6

14

31

13

6

7


CA100 (insulation thickness 100 mm), insertion loss

Nominal size Nominal length Centre frequency fm [Hz]
Nominal size Nominal length 63 125 250 500 1000 2000 4000 8000
Nominal size Nominal length De
Nominal size mm Hz

100

500

4

9

12

18

35

33

26

14

100

1000

5

17

24

35

50

50

47

25

125

500

4

7

10

17

31

26

19

11

125

1000

5

14

21

32

48

44

33

20

160

500

3

6

9

15

28

20

13

8

160

1000

5

11

18

30

42

33

22

15

200

500

3

5

8

15

25

16

9

7

200

1000

4

9

16

28

38

26

16

12

250

500

2

4

7

14

21

13

6

5

250

1000

3

8

14

26

33

21

11

9

250

1500

4

11

21

37

41

27

15

12

315

500

2

3

6

13

18

10

4

4

315

1000

3

6

12

24

29

16

8

7

315

1500

3

9

18

34

35

21

10

9

400

500

1

3

6

12

17

8

3

3

400

1000

2

5

11

23

25

12

5

5

400

1500

3

7

16

32

31

16

7

7

450

1000

2

5

10

22

23

11

4

5

450

1500

2

6

15

31

29

14

6

6

500

1000

2

4

10

21

22

10

4

4

500

1500

2

6

14

30

27

13

5

6

560

1500

2

5

13

29

25

11

4

5

630

1500

2

5

12

28

23

10

4

4

710

1500

2

5

11

27

22

9

3

4

800

1500

2

4

11

26

20

8

2

3


CA, differential pressure

Nominal size V Nennlänge [mm]
Nominal size V 500 1000 1500
Nominal size V ∆pst
Nominal size l/s m³/h Pa

100

30

108

2

2


100

60

216

4

8


100

75

270

6

12


100

90

324

8

18


125

50

180

2

2


125

95

342

4

6


125

120

432

6

10


125

145

522

6

14


160

80

288

2

2


160

155

558

2

6


160

195

702

4

8


160

235

846

6

10


200

125

450

2

2


200

245

882

2

4


200

310

1116

4

6


200

370

1332

4

8


250

195

702

<2

<2

<2

250

385

1386

<2

4

4

250

485

1746

2

4

6

250

580

2088

4

6

8

315

310

1116

<2

<2

<2

315

615

2214

<2

2

4

315

770

2772

<2

4

4

315

925

3330

2

4

6

400

500

1800

<2

<2

<2

400

995

3582

<2

<2

2

400

1245

4482

<2

2

4

400

1495

5382

<2

4

4

450

630

2268


<2

<2

450

1260

4536


<2

<2

450

1575

5670


<2

4

450

1890

6804


2

4

500

780

2808


<2

<2

500

1560

5616


<2

2

500

1950

7020


2

2

500

2335

8406


2

4

560

980

3528



<2

560

1955

7038



<2

560

2445

8802



2

560

2935

10566



4

630

1240

4464



<2

630

2480

8928



<2

630

3095

11142



<2

630

3715

13374



<2

710

1575

5670



<2

710

3150

11340



<2

710

3935

14166



<2

710

4725

17010



<2

800

2000

7200



<2

800

4000

14400



<2

800

5000

18000



<2

800

6000

21600



<2


Circular silencers for air conditioning systems, rigid construction, available in 13 nominal sizes.

Insertion loss measured according to ISO 7235.

Casing with acoustic and thermal insulation.

Various types of connection, suitable for circular ducts to EN 1506 or EN 13180.

Casing air leakage to EN 15727, class B.

Special features

  • Insertion loss measured according to ISO 7235
  • Absorption material is non-combustible
  • Insulation thickness 50 mm or 100 mm

Materials and surfaces

  • Casing and perforated inner duct are galvanised sheet steel
  • Lining is mineral wool


Mineral wool

  • To EN 13501, fire rating class A1, non-combustible
  • RAL quality mark RAL-GZ 388
  • Biosoluble and hence hygienically safe according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EC
  • Faced with glass fibre as protection against erosion through airflow velocities up to 20 m/s
  • Inert to fungal and bacterial growth

Technical data

  • Nominal sizes: 100 to 800 mm
  • Operating pressure: 1000 Pa max.
  • Operating temperature: 100 °C max.

Sizing data

  • D _______________________ [mm]
  • H _______________________ [mm]
  • Insulation thickness __________ [mm]
  • V _______________________ [m³/h]
  • De at 250 Hz ________________ [dB]
  • Δpst _______________________ [Pa]

00107076_0.

 Type
CA        Circular silencer

 Insulation thickness [mm]
050       50
100       100

Nominal size [mm]
100
125
160
200
250
315
400
450
500
560
630
710
800

 

 Nominal length [mm]
500
1000
1500

 Matching flange
       No entry: none
GE       on one end (only VF1)
GZ       on both ends (only VF2)

 Type of connection
       No entry: spigot
VD2       Spigot with lip seal on both ends
VF1       Flange on one end
VF2       Flanges on both ends

Order example: CA100/315×1500/GZ/VF2

Insulation thickness

100 mm

Nominal size

315 mm

Length

1500 mm

Matching flange

Both ends

Type of connection

Flanges on both ends


 

Variants, Dimensions and weight

  • Variants
  • Dimensions and weight

CA

Variant

  • Circular silencer for the reduction of noise
  • Spigot

CA/.../VF1

Variant

  • Circular silencer for the reduction of noise
  • Spigot on one end to make connections to the ducting
  • With flange on one end to make a detachable connection to the ducting

CA/.../VF2

Variant

  • Circular silencer for the reduction of noise
  • With flanges on both ends to make detachable connections to the ducting

The tables show the available nominal sizes

CA, dimensions

Nominal size
CA-050
ØD3
mm
CA-100
ØD3
mm
ØD
mm
ØD1
mm
ØD2
mm
n
T
mm
100 199 299 99 132 152 4 4
125 224 324 124 157 177 4 4
160 259 359 159 192 212 6 4
200 299 399 199 233 253 6 4
250 349 449 249 283 303 6 4
315 414 514 314 352 378 8 4
400 499 599 399 438 464 8 4
450 648 448 488 514 8 4
500 698 498 538 564 8 4
560 758 558 600 634 12 4
630 828 628 670 704 12 4
710 908 708 750 784 12 4
800 998 798 840 874 16 4


CA, lengths

Nominal length
mm
LN
CA
L
mm
CA/.../VF1
L
mm
CA/.../VF2
L
mm
L1
mm
500 500 490 480 380
1000 1000 990 980 880
1500 1500 1490 1480 1380


CA, weights

Nominal size
CA-050
500
m
kg
CA-050
1000
m
kg
CA-050
1500
m
kg
CA-100
500
m
kg
CA-100
1000
m
kg
CA-100
1500
m
kg
100 4 7 6 11
125 5 9 7 13
160 70 12 9 16
200 7 13 9 17
250 9 16 22 11 20 29
315 12 20 28 14 25 35
400 15 25 34 18 30 42
450 33 46
500 36 52
560 55
630 62
710 68
800 76


CA/.../VF1, weights

Nominal size
CA-050
500
m
kg
CA-050
1000
m
kg
CA-050
1500
m
kg
CA-100
500
m
kg
CA-100
1000
m
kg
CA-100
1500
m
kg
100 4 7 6 11
125 5 9 7 13
160 8 13 10 17
200 8 14 10 18
250 10 17 23 12 21 30
315 13 21 29 15 26 36
400 16 26 35 19 31 43
450 34 47
500 38 54
560 57
630 64
710 71
800 79


CA/.../VF2, weights

Nominal size
CA-050
500
m
kg
CA-050
1000
m
kg
CA-050
1500
m
kg
CA-100
500
m
kg
CA-100
1000
m
kg
CA-100
1500
m
kg
100 4 7 6 11
125 6 10 8 14
160 8 13 10 17
200 8 14 10 18
250 10 17 23 12 21 30
315 14 22 30 16 27 37
400 18 28 37 21 33 45
450 36 49
500 39 55
560 59
630 67
710 73
800 82


Installation details, Basic information and nomenclature

  • Installation details
  • Basic information and nomenclature

Installation and commissioning

  • Any installation orientation
  • Installation in ducts outside of closed rooms requires sufficient protection against the effects of weather

Principal dimensions

ØD [mm]

Outer diameter of the spigot

ØD₃ [mm]

Outer diameter of circular silencers

L [mm]

Length of attenuator/silencer including spigot (in airflow direction)

L₁ [mm]

Length of acoustic cladding and acoustically effective length

B [mm]

Attenuator width and duct width (upright splitters)

H [mm]

Attenuator height and duct height (upright splitters)

T [mm]

Splitter thickness

S [mm]

Airway width

n [ ]

Number of flange screw holes

m [kg]

Weight

Nomenclature

fm [Hz]

Octave band centre frequency

LWA [dB(A)]

A-weighted sound power level of air-regenerated noise

De [dB]

Insertion loss

V [m³/h] and [l/s]

Volume flow rate

Δpst [Pa]

Static differential pressure


All sound power levels are based on 1 pW.


All values were measured in a TROX lab and to EN ISO 7235. Intermediate values may be achieved by interpolation.


Lab measurements exceeding 50 dB are indicated as 50 dB, in line with common practice.

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For general question regarding products or services you can also call:
Tel.: +971 4 3417448 | Fax: +971 4 3417449