Type CF

For the reduction of noise in circular ducts, flexible aluminium construction

Circular silencers, in flexible aluminium construction, 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
  • Casing and perforated inner duct made of aluminium
  • 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 D


Optional equipment and accessories

  • Socket-type spigots on both ends
  • Raised edges at both ends
  • With lip seals on both ends

Flexible circular silencer Type CF 00131786_0


  • Application
  • Description

Application

  • Flexible circular silencers Type CF for the reduction of noise in the circular ducts of air conditioning systems
  • For the reduction of air-regenerated noise of air terminal units LVC and TVR, and of mechanical self-powered controllers 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 characteristics

  • Insertion loss measured according to ISO 7235
  • Very flexible and consequently suitable for installation in complicated duct systems and restricted spaces
  • Absorption material is non-combustible
  • Insulation thickness 25 mm or 50 mm
  • Smallest bend radius 3 × outer diameter D₃

Nominal sizes

  • 80, 100, 125, 160, 200, 250, 315, 400 mm

Variants

  • 025: Circular silencer with 25 mm insulation
  • 050: Circular silencer with 50 mm insulation
  • AS2: Circular silencer with socket-type spigots on both ends
  • BK2: Circular silencer with raised edges at both ends

Parts and characteristics

  • Casing
  • Perforated inner tube
  • Absorption material

Accessories

  • VD2: With lip seals on both ends
  • AS2: Socket-type spigots on both ends
  • BK2: Raised edges at both ends

Construction features

  • Circular casing
  • Flexible construction
  • Spigot suitable for circular ducts to EN 1506 or EN 13180
  • Spigot with groove for lip seal
  • Maximum operating pressure 1000 Pa
  • Max. operating temperature 100 °C

Materials and surfaces

  • Casing and perforated inner duct made of aluminium
  • Lining is mineral wool
  • End pieces made ABS plastic, flammability to UL  94, V-0 (nominal sizes 80 – 125)
  • End pieces made of aluminium (nominal sizes 160 – 400)


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
  • Inert to fungal and bacterial growth

Standards and guidelines

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

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

80 – 400 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.

CF025 (insulation thickness 25 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

80

500

1

2

4

9

20

16

15

10

80

1000

3

5

10

21

44

46

37

23

80

1500

3

5

13

28

47

48

44

31

80

2000

3

6

15

35

50

50

50

39

100

500

1

1

4

8

17

14

12

9

100

1000

2

3

8

17

44

34

28

21

100

1500

2

4

12

24

47

41

34

26

100

2000

2

5

15

30

50

49

41

31

125

500

1

1

3

8

15

11

9

7

125

1000

2

3

7

17

43

30

24

17

125

1500

2

3

10

22

45

34

28

20

125

2000

2

4

12

28

48

37

32

23

160

500

1

1

2

5

14

10

8

6

160

1000

1

1

4

12

40

27

20

16

160

1500

2

2

6

16

42

30

25

19

160

2000

2

3

8

20

47

34

28

21

200

500

1

1

2

5

14

9

6

5

200

1000

1

1

3

11

35

22

16

13

200

1500

2

2

5

15

41

27

19

15

200

2000

1

3

7

19

47

32

20

16

250

500

0

1

2

5

13

8

5

4

250

1000

1

1

3

11

30

19

12

10

250

1500

1

2

5

15

38

25

14

11

250

2000

1

3

6

17

43

30

15

13

315

500

0

1

1

4

9

7

4

3

315

1000

0

1

3

9

21

10

12

8

315

1500

1

2

4

12

27

19

13

10

315

2000

1

2

6

14

32

27

13

11

400

500

0

0

1

3

6

5

3

3

400

1000

0

1

3

8

16

8

8

7

400

1500

1

1

4

10

23

17

11

8

400

2000

1

2

4

10

23

22

11

9


CF050 (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

80

500

4

5

11

20

30

27

16

12

80

1000

8

14

23

47

50

50

44

27

80

1500

11

14

33

48

50

50

47

37

80

2000

15

15

42

50

50

50

50

47

100

500

3

4

9

17

24

21

12

10

100

1000

7

10

21

38

50

50

29

22

100

1500

10

11

27

44

50

50

37

30

100

2000

12

12

34

50

50

50

46

37

125

500

2

3

7

14

20

16

11

9

125

1000

5

7

16

32

50

42

25

22

125

1500

7

9

21

41

50

46

33

27

125

2000

9

11

27

50

50

50

40

31

160

500

2

2

6

12

17

14

8

6

160

1000

4

5

12

26

47

34

20

16

160

1500

5

7

17

37

48

42

24

19

160

2000

6

9

22

48

50

50

29

21

200

500

1

2

5

12

16

11

6

5

200

1000

3

5

11

25

45

26

16

13

200

1500

4

6

14

37

48

34

18

15

200

2000

5

8

18

47

50

42

22

18

250

500

1

2

4

12

15

8

5

4

250

1000

2

4

9

25

40

19

12

10

250

1500

3

5

11

35

45

25

14

11

250

2000

4

6

15

45

50

30

16

13

315

500

1

1

3

9

12

6

4

3

315

1000

1

4

8

22

28

13

12

8

315

1500

2

4

10

26

35

19

12

10

315

2000

3

4

12

33

41

27

14

11

400

500

1

1

3

7

9

6

4

3

400

1000

1

4

8

18

23

11

10

7

400

1500

2

4

9

20

26

17

11

8

400

2000

3

3

9

22

29

22

11

9


CF, differential pressure

Nominal size V Nennlänge [mm]
Nominal size V 500 1000 1500 2000
Nominal size V ∆pst
Nominal size l/s m³/h Pa

80

20

72

2

4

6

6

80

40

144

6

12

16

25

80

50

180

8

16

25

35

80

55

198

12

25

35

45

100

30

108

2

2

4

5

100

60

216

4

8

12

16

100

75

270

6

12

18

25

100

90

324

8

18

25

35

125

50

180

2

2

4

4

125

95

342

4

6

10

12

125

120

432

6

10

14

18

125

145

522

6

14

20

25

160

80

288

2

2

2

4

160

155

558

2

6

8

10

160

195

702

4

8

10

14

160

235

846

6

10

14

18

200

125

450

2

2

2

2

200

245

882

2

4

6

8

200

310

1116

4

6

8

10

200

370

1332

4

8

10

14

250

195

702

<2

<2

<2

2

250

385

1386

<2

4

4

6

250

485

1746

2

4

6

8

250

580

2088

4

6

8

10

315

310

1116

<2

<2

<2

<2

315

615

2214

<2

2

4

4

315

770

2772

<2

4

4

6

315

925

3330

2

4

6

8

400

500

1800

<2

<2

<2

<2

400

995

3582

<2

<2

2

4

400

1245

4482

<2

2

4

4

400

1495

5382

<2

4

4

6


Circular silencers for air conditioning systems, flexible construction, available in 8 nominal sizes.

Insertion loss measured according to ISO 7235.

Casing with acoustic and thermal insulation.

Spigot with groove for lip seal, suitable for circular connecting ducts to EN 1506 or EN 13180.

Casing air leakage to EN 15727, class D.

Special characteristics

  • Insertion loss measured according to ISO 7235
  • Very flexible and consequently suitable for installation in complicated duct systems and restricted spaces
  • Absorption material is non-combustible
  • Insulation thickness 25 mm or 50 mm
  • Smallest bend radius 3 × outer diameter D₃

Materials and surfaces

  • Casing and perforated inner duct made of aluminium
  • Lining is mineral wool
  • End pieces made ABS plastic, flammability to UL  94, V-0 (nominal sizes 80 – 125)
  • End pieces made of aluminium (nominal sizes 160 – 400)


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
  • Inert to fungal and bacterial growth

Technical data

  • Nominal sizes: 80 to 400 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]

00107073_0.

 Type
CF       Flexible circular silencer

 Insulation thickness [mm]
025       25
050       50

 

Nominal size [mm]
80
100
125
160
200
250
315
400

 Nominal length [mm]
500
1000
1500
2000

 Type of connection
       No entry: spigot
VD2       Spigot with lip seal on both ends
AS2       Socket-type spigots on both ends
BK2       Raised edges at both ends

Order example: CF-050/160×1000/VD2

Insulation thickness

50 mm

Nominal size

160 mm

Length

1000 mm

Type of connection

Spigot with lip seal on both ends


 

Variants, Dimensions and weight

  • Variants
  • Dimensions and weight

CF

Variant

  • Circular silencer for the reduction of noise
  • Spigot

CF/.../AS2

Variant

  • Circular silencer for the reduction of noise
  • Socket-type spigots to make connections to the ducting

CF/.../BK2

Variant

  • Circular silencer for the reduction of noise
  • With raised edges to make detachable connections to the ducting

CF, dimensions

Nominal size
CF-025
ØD3
mm
CF-050
ØD3
mm
ØD
mm
ØD2
mm
80 135 192 79 93
100 160 212 99 113
125 191 236 124 138
160 221 271 159 173
200 261 311 199 213
250 311 366 249 263
315 376 426 314 328
400 461 511 399 413


CF, lengths

Nominal length
mm
LN
CF
L
mm
CF/.../AS2
L
mm
CF/.../BK2
L
mm
L1
mm
500 650 650 638 500
1000 1150 1150 1138 1000
1500 1650 1650 1638 1500
2000 2150 2150 2138 2000


CF, weights

Nominal size
CF-025
500
m
kg
CF-025
1000
m
kg
CF-025
1500
m
kg
CF-025
2000
m
kg
CF-050
500
m
kg
CF-050
1000
m
kg
CF-050
1500
m
kg
CF-050
2000
m
kg
80 0.6 1.0 1.5 1.9 0.9 1.5 2.2 2.8
100 0.8 1.3 1.7 2.2 1.1 1.8 2.5 3.2
125 0.9 1.5 2.1 2.7 1.2 2.0 2.9 3.7
160 1.1 1.8 2.5 3.2 1.4 2.4 3.3 4.3
200 1.3 2.2 3.0 3.9 1.7 2.9 4.0 5.1
250 1.6 2.7 3.7 4.7 2.1 3.5 4.8 6.2
315 1.9 3.2 4.5 5.7 2.4 4.0 5.6 7.2
400 2.5 4.1 5.6 7.2 3.1 5.1 7.1 9.1


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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Thank you for your message!

Visual contact Visual contact

Your message is send and will be processed shortly.
Our department for Service-Requests will contact you asap.
For general question regarding products or services you can also call:
Tel.: +971 4 3417448 | Fax: +971 4 3417449