CF_img_01psd.png
Flexible circular silencer Type CF

CF_img_01psd.png

CF

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

Circular silencers, of a flexible aluminium construction, for the reduction of noise in the circular ducts of ventilation and air conditioning systems

  • The sound absorbing 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

 

 

 


General Information

Application

  • Flexible circular silencer for the reduction of noise in the circular ducts of ventilation and air conditioning systems
  • For the reduction of air-regenerated noise of air terminal units LVC, TVR, TVE 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 features

  • Insertion loss measured according to ISO 7235
  • Very flexible and consequently suitable for installation in complicated duct systems and restricted spaces
  • The sound absorbing material is non-combustible
  • Insulation thickness 25 mm or 50 mm
  • Smallest bend radius 3 × outer diameter ØD₃


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
  • Max. 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 of aluminium


Mineral wool

  • To EN 13501, fire rating Class A1, non-combustible
  • RAL quality mark RAL-GZ 388
  • Biosoluble and hence non-hazardous to health 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

  • Low-maintenance as construction and materials are not subject to wear


Technical information

Technical data, Quick sizing, Specification text, Order code

  • TECHNICAL DATA
  • QUICK SIZING
  • SPECIFICATION TEXT
  • ORDER CODE

Nominal sizes80 – 400 mm
Operating pressure1000 Pa max.
Operating temperature100 °C max.

The stated differential pressures for circular silencers correspond to the values for plain, unprofiled ducts. 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 De [dB]

NS

FLN

Centre frequency f[Hz]

63

125

250

500

1000

2000

4000

8000

80500124920161510
80100035102144463723
80150035132847484431
80200036153550505039
10050011481714129
10010002381744342821
100150024122447413426
100200025153050494131
1255001138151197
12510002371743302417
125150023102245342820
125200024122848373223
1605001125141086
16010001141240272016
16015002261642302519
16020002382047342821
200500112514965
20010001131135221613
20015002251541271915
20020001371947322016

250

500

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

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

1

3

6

5

3

3

400

1000

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 De [dB]

NS

FLN

Centre frequency fm [Hz]

63

125

250

500

1000

2000

4000

8000

8050045112030271612
801000814234750504427
8015001114334850504737
8020001515425050505047
1005003491724211210
1001000710213850502922
10015001011274450503730
10020001212345050504637
125500237142016119
125100057163250422522
125150079214150463327
1252000911275050504031
16050022612171486
160100045122647342016
160150057173748422419
160200069224850502921
20050012512161165
200100035112545261613
200150046143748341815
200200058184750422218
2505001241215854
25010002492540191210
250150035113545251411
250200046154550301613
315500113912643
3151000148222813128
315150024102635191210
315200034123341271411
40050011379643
4001000148182311107
4001500249202617118
4002000339222922119



 CF, differential pressure Δpt [Pa]

NS

q [l/s]

q (m³/h)

500

1000

1500

2000

Δpt [Pa]

8020722466
80401446121625
80501808162535
805519812253545
100301082245
10060216481216
100752706121825
100903248182535
125501802244
12595342461012
1251204326101418
1251455226142025
160802882224
16015555826810
160195702481014
1602358466101418
2001254502222
2002458822468
200310111646810
2003701332481014
250195702<2<2<22
2503851386<2446
25048517462468
250580208846810
3153101116<2<2<2<2
3156152214<2244
3157702772<2446
31592533302468
4005001800<2<2<2<2
4009953582<2<224
40012454482<2244
40014955382<2446

Specification text

Circular silencers for ventilation and 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 lip seal for circular ducts according to EN 1506 or EN 13180. Casing leakage to EN 15727, class D.


Special features

  • Insertion loss measured according to ISO 7235
  • Very flexible and consequently suitable for installation in complicated duct systems and restricted spaces
  • The sound absorbing material is non-combustible
  • Insulation thickness 25 mm or 50 mm
  • Smallest bend radius 3 × outer diameter ØD₃


Materials and surfaces

  • Casing and perforated inner duct made of aluminium
  • Lining is mineral wool
  • End pieces made of aluminium

Mineral wool

  • To EN 13501, fire rating Class A1, non-combustible
  • RAL quality mark RAL-GZ 388
  • Biosoluble and hence non-hazardous to health 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

  • ØD [mm]
  • H [mm]
  • Insulation thickness [mm] 
  • q (m³/h)
  • De At 250 Hz [dB]
  • Δp[Pa]

CF025 / 160×1000 / VD2
|||||
12345

1 Type
CF flexible circular silencer 

2 Insulation thickness [mm]
025 25050 50 

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

4 Nominal length [mm]
500, 1000, 1500, 2000

5 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 thickness50 mm
Nominal size160 mm
Length1000 mm
Type of connectionSpigot with lip seal on both ends

Variants, Dimensions and weights, Product details

  • VARIANTS
  • DIMENSIONS AND WEIGHTS
  • PRODUCT DETAILS

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


CF, dimensions
NS∅D₃ (CF-025)∅D₃ (CF-050)∅D
8013519279
10016021299
125191236124
160221271159
200261311199
250311366249
315376426314
400461511399

CF, lengths

FLN

FL

L₁

500650500
100011501000
150016501500
200021502000


CF/.../AS2

CF/.../AS2, dimensions

NS∅D₃ (CF-025)∅D₃ (CF-050)∅D
8013519280
100160212100
125191236125
160221271160
200261311200
250311366250
315376426315
400461511400

CF/.../AS2, lengths

FLN

FL

L₁

500650500
100011501000
150016501500
200021502000


CF/.../BK2

CF/.../BK2, dimensions

NS∅D₃ (CF-025)∅D₃ (CF-050)∅D∅D₂
801351927993
10016021299113
125191236124138
160221271159173
200261311199213
250311366249263
315376426314328
400461511399413

CF/.../BK2, lengths

FLN

FL

L₁

500638500
100011381000
150016381500
200021382000


CF, weights
NSCF-025CF-050
500100015002000500100015002000

80

1

1

2

2

1

2

2

3

100

1

1

2

2

1

2

3

3

125

1

2

2

3

1

2

3

4

160

1

2

3

3

1

2

3

4

200

1

2

3

4

2

3

4

5

250

2

3

4

5

2

4

5

6

315

2

3

5

6

2

4

6

7

400

3

4

6

7

3

5

7

9


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

Downloads

product information

certificates

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Our department for Service-Requests will contact you asap.
For general question regarding products or services you can also call:
Tel.: +44 (0)1842 754545 | Fax: +44 (0)1842 763051