CAK

Circular silencer Type CAK

For the reduction of noise in plastic circular ducts for contaminated air

Plastic circular silencers for the reduction of noise in the circular ducts of extract air systems for aggressive media

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 flame-resistant polypropylene (PPs) to DIN 4102, building class B1
Variant with spigot suitable for circular ducts according to DIN 8077 or DIN 8078
Insertion loss measured according to ISO 7235
Casing air leakage to EN 15727, class D

Optional equipment and accessories

With flanges on both ends

General information

Application

Plastic circular silencers Type CAK for the reduction of noise in the circular ducts of air conditioning systems
Suitable for contaminated air
For the reduction of air-regenerated noise of air terminal units TVRK and TVLK
For the reduction of fan noise

Special features

Insertion loss measured according to ISO 7235
Absorption material is non-combustible

Nominal sizes

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

Variants

CAK: Circular silencer
VF2: Circular silencer with flanges on both ends

Parts and characteristics

Casing
Perforated inner tube
Absorption material

Accessories

Matching flanges for both ends, including seals

Construction features

Circular casing
Spigot suitable for circular ducts according to DIN 8077 or DIN 8078
Maximum operating pressure 1000 Pa
Max. operating temperature 100 °C

Materials and surfaces

Casing and perforated inner duct are flame-resistant polypropylene (PPs) to DIN 4102, building class B1
Lining is mineral wool

Mineral wool

To EN 13501, fire rating class A2, 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 D

Maintenance

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

Technical information

Technical data, Quick sizing, Specification text, Order code

Nominal sizes	125 – 400 mm
Operating pressure	1000 Pa
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.

CAK, insertion loss

Nominal size	Nominal length	Centre frequency f_m [Hz]
Nominal size	Nominal length	63	125	250	500	1000	2000	4000	8000
Nominal size	Nominal length	D_e
Nominal size	mm	Hz
125	500	1	6	7	14	25	23	14	12
125	1000	2	9	13	22	34	35	24	16
125	1500	3	12	19	31	42	43	33	20
160	500	0	3	5	11	22	21	12	10
160	1000	1	4	9	18	30	31	19	13
160	1500	2	7	13	25	38	41	27	17
200	500	0	2	4	10	21	17	10	8
200	1000	1	4	9	15	29	25	16	11
200	1500	1	6	12	21	36	33	20	14
250	500	0	2	4	9	19	13	9	8
250	1000	0	4	8	14	26	22	15	11
250	1500	1	6	11	20	35	30	20	15
315	500	0	2	3	8	18	12	7	6
315	1000	0	4	6	14	26	17	11	8
315	1500	1	6	9	19	34	23	15	10
400	500	0	2	3	6	14	8	6	4
400	1000	0	3	6	11	25	13	10	7
400	1500	1	4	8	16	29	15	11	8

CAK, differential pressure

Nominal size	V		Nennlänge [mm]
Nominal size	V		500	1000	1500
Nominal size	V		∆p_st
Nominal size	l/s	m³/h	Pa
125	50	180	2	2	4
125	95	342	4	6	10
125	120	432	6	10	14
125	145	522	6	14	20
160	80	288	2	2	2
160	155	558	2	6	8
160	195	702	4	8	10
160	235	846	6	10	14
200	125	450	2	2	2
200	245	882	2	4	6
200	310	1116	4	6	8
200	370	1332	4	8	10
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

Plastic circular silencers for use in extract air systems subject to aggressive media; they reduce the air-regenerated noise in plastic ducts (absorption principle).

Insertion loss measured according to ISO 7235.

Absorption material is mineral wool with RAL quality mark RAL-GZ 388.

Spigot, suitable for ducts according to DIN 8077.

Casing air leakage to EN 15727, class D.

Special features

Insertion loss measured according to ISO 7235
Absorption material is non-combustible

Materials and surfaces

Casing and perforated inner duct are flame-resistant polypropylene (PPs) to DIN 4102, building class B1
Lining is mineral wool

Mineral wool

To EN 13501, fire rating class A2, 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: 125 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]
D_e at 250 Hz ________________ [dB]
Δp_st _______________________ [Pa]

Type
CAK Circular silencer

Nominal size [mm]
125
160
200
250
315
400

Length [mm]
500
1000
1500

Matching flange
No entry: none
GZ on both ends (only VF2)

Type of connection
No entry: spigot
VF2 Flanges on both ends

Order example: CAK/200×1000

Nominal size	200 mm
Length	1000 mm
Type of connection	Spigot

Variants, Dimensions and weight

CAK

Variant

Circular silencer for the reduction of noise
Spigot

CAK/.../VF2

Variant

Circular silencer for the reduction of noise
With flanges to make detachable connections to the ductwork

CAK

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

f_m [Hz]

Octave band centre frequency

L_WA [dB(A)]

A-weighted sound power level of air-regenerated noise

D_e [dB]

Insertion loss

V [m³/h] and [l/s]

Volume flow rate

Δp_st [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.

Downloads

product information

Product data sheet Type CAK

Product data sheet 510 KB pdf

certificates

Certificate concerning statistical leakage tests

LC_v2_2024_10_DE_en Certificate 650 KB pdf
Declaration of conformity or declaration of incorporation Type CAK

Declaration of conformity or declaration of incorporation 130 KB pdf

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