CAH

Spigot with groove

Spigot with lip seal

Socket-type spigot

Circular silencers for the reduction of noise in circular ducts of ventilation and air conditioning systems

Circular silencer made of galvanised sheet steel or stainless steel

Attenuation effect due to absorption

The sound absorbing material is non-combustible mineral wool and non-hazardous to health according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EC

Acoustic data measured to ISO 7235

Leakage class C or D (depending on size) to EN 15727.

For use in areas with potentially explosive atmospheres (according to EC Directive 2014/34/EU (ATEX)), zones 1, 2, and zones 21 and 22 (outside) according to EC Directive 1999/92/EC

Optional equipment and accessories

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

Socket-type spigot suitable for circular ducts to EN 1506 or EN 13180

General information

Application

Circular silencer for the reduction of noise

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

The sound absorbing material is non-combustible

Insulation thickness 25, 50 or 100 mm

Leakage class D for nominal sizes up to and including 400 mm

Leakage class C from nominal size 450 mm

Nominal sizes

ØD: 80, 100, 125, 160, 200, 250, 315, 400, 450, 500, 560, 630, 710, 800 mm

L: 500, 1000, 1500 mm

For VAV terminal units and CAV controllers

ØD: 100, 125, 160, 200, 250, 315, 400 mm

Variants

025: Circular silencer with 25 mm insulation

050: Circular silencer with 50 mm insulation

100: Circular silencer with 100 mm insulation

Construction

Circular silencer

No entry: galvanised steel 1.0917
A2: Stainless steel 1.4301

Type of connection:

No entry: spigot with groove on both ends
D2: Spigot with lip seal on both ends
AS: Spigot with lip seal and socket-type spigot on one end

Parts and characteristics

Circular casing
Perforated inner duct
Absorption material

Construction features

Circular casing
- Outer duct: spiral duct, galvanised steel 1.0917
- Outer duct: plain duct, stainless steel 1.4301

Spigot suitable for circular ducts to EN 1506 or EN 13180
Lip seals up to nominal size 800
Max. operating pressure 2000 Pa
Max. airflow velocity 20 m/s
Max. operating temperature 90 °C

Materials and surfaces

Outer duct and perforated inner duct are spiral ducts made of galvanised sheet steel 1.0917
Plain outer duct made of stainless steel 1.4301

Perforated inner duct in stainless steel 1.4301
Spigot made of galvanised sheet steel 1.0917 or stainless steel 1.4301

Absorption material is mineral wool
- To EN 13501-1, fire rating class A1, non-combustible
- Non-hazardous to health according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EC
- Inner duct with non-woven fibre (fleece) as a protection against erosion from airflow velocities of up to 20 m/s
- Inert to fungal and bacterial growth according to EN 846

Standards and guidelines

Insertion loss and sound power level of air-regenerated noise tested to ISO 7235
Meets the hygiene requirements of VDI 6022, VDI 3803 Part 1 and DIN 1946 Part 4
EC Directive 2014/34/EC (ATEX): Equipment and protective systems intended for use in areas with potentially explosive atmospheres
EC Directive 1999/92/EC (ATEX): Improvement of the safety and health protection of workers potentially at risk from explosive atmospheres

Leakage class and pressure class according to EN 15727

Maintenance

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

Description

Variants

025: Circular silencer with 25 mm insulation

050: Circular silencer with 50 mm insulation

100: Circular silencer with 100 mm insulation

Parts and characteristics

Circular casing
Perforated inner duct
Absorption material

Construction features

Circular casing
- Outer duct: spiral duct, galvanised steel 1.0917
- Outer duct: plain duct, stainless steel 1.4301

Spigot suitable for circular ducts to EN 1506 or EN 13180
Lip seals up to nominal size 800
Max. operating pressure 2000 Pa
Max. airflow velocity 20 m/s
Max. operating temperature 90 °C

Nominal sizes

ØD: 80, 100, 125, 160, 200, 250, 315, 400, 450, 500, 560, 630, 710, 800 mm

L: 500, 1000, 1500 mm

For VAV terminal units and CAV controllers

ØD: 100, 125, 160, 200, 250, 315, 400 mm

Información técnica

Technical data, Quick sizing, Specification text, Order code

Nominal sizes	80 – 800 mm
Operating pressure	2000 Pa max.
Operating temperature	90 °C max.

The stated differential pressures for circular silencers apply to 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.

Insulation thickness 25 mm, insertion loss D_e [dB]

Nominal size	Nominal length	Centre frequency f_m [Hz]
Nominal size	Nominal length	63	125	250	500	1000	2000	4000	8000
80	500	1	2	4	8	15	20	22	13
80	1000	1	5	9	17	30	42	38	32
100	500	1	2	4	8	15	20	22	13
100	1000	1	5	9	17	30	42	38	22
125	500	1	2	3	8	14	18	19	11
125	1000	1	4	8	15	27	39	32	19
160	500	1	1	3	7	13	17	14	9
160	1000	1	3	7	13	25	35	25	15
200	500	1	1	3	6	12	15	11	7
200	1000	1	3	6	12	21	32	19	12

Insulation thickness 50 mm, insertion loss D_e [dB]

Nominal size	Nominal length	Centre frequency fm [Hz]
Nominal size	Nominal length	63	125	250	500	1000	2000	4000	8000
100	500	3	5	8	14	23	28	16	13
100	1000	5	8	14	26	42	48	34	23
125	500	3	4	7	12	21	24	13	11
125	1000	4	7	12	23	38	41	28	20
160	500	2	3	6	11	19	19	9	8
160	1000	3	5	10	20	34	33	21	16
200	500	2	3	5	9	17	14	6	6
200	1000	3	4	8	17	31	25	15	12
250	500	1	2	4	8	15	10	3	4
250	1000	2	3	6	14	27	18	9	9
250	1500	3	4	9	20	40	26	15	13
315	500	1	1	3	7	12	8	2	3
315	1000	1	2	5	12	24	12	7	6
315	1500	1	3	7	18	35	16	12	9
400	500	1	1	3	5	12	6	1	3
400	1000	1	2	4	10	22	10	4	5
400	1500	1	2	6	15	32	13	8	7

Insulation thickness 100 mm, insertion loss D_e [dB]

Nominal size	Nominal length	Centre frequency fm [Hz]
Nominal size	Nominal length	63	125	250	500	1000	2000	4000	8000
100	500	4	8	12	18	35	32	24	13
100	1000	6	16	24	35	50	50	41	24
125	500	4	7	11	17	32	27	20	11
125	1000	5	14	21	32	48	45	34	20
160	500	3	6	10	16	28	22	15	9
160	1000	4	12	19	30	43	36	26	16
200	500	3	5	8	15	25	17	10	7
200	1000	4	10	16	28	38	29	19	13
250	500	2	4	7	14	22	13	6	5
250	1000	3	8	14	26	32	21	12	9
250	1500	4	11	22	38	43	30	18	14
315	500	2	3	6	13	19	10	5	4
315	1000	3	6	12	24	27	15	7	7
315	1500	3	8	18	34	35	20	10	9
400	500	2	3	6	12	18	8	3	3
400	1000	2	5	11	22	24	12	5	5
400	1500	3	7	16	32	31	17	8	7
450	1000	2	5	10	22	23	11	4	5
450	1500	3	7	15	31	29	15	7	7
500	1000	2	4	10	21	22	10	4	4
500	1500	2	6	14	31	28	14	6	6
560	1500	2	6	13	30	26	12	5	5
630	1500	2	5	12	29	24	10	4	4
710	1500	2	4	11	28	22	9	3	4
800	1500	1	4	10	27	20	7	2	3

Circular silencers for ventilation and air conditioning systems, rigid construction, available in 14 nominal sizes and with 3 insulation thicknesses
Insertion loss measured according to ISO 7235.
Casing with acoustic and thermal insulation.
Galvanised steel or stainless steel.
Various types of connection, suitable for circular ducts to EN 1506 or EN 13180.
Leakage class C or D (depending on size) to EN 15727.

Special features

Insertion loss measured according to ISO 7235

The sound absorbing material is non-combustible

Insulation thickness 25, 50 or 100 mm

Leakage class D for nominal sizes up to and including 400 mm

Leakage class C from nominal size 450 mm

Materials and surfaces

Outer duct and perforated inner duct are spiral ducts made of galvanised sheet steel 1.0917
Plain outer duct made of stainless steel 1.4301

Perforated inner duct in stainless steel 1.4301
Spigot made of galvanised sheet steel 1.0917 or stainless steel 1.4301

Absorption material is mineral wool
- To EN 13501-1, fire rating class A1, non-combustible
- Non-hazardous to health according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EC
- Inner duct with non-woven fibre (fleece) as a protection against erosion from airflow velocities of up to 20 m/s
- Inert to fungal and bacterial growth according to EN 846

Construction

Circular silencer

No entry: galvanised steel 1.0917
A2: Stainless steel 1.4301

Type of connection:

No entry: spigot with groove on both ends
D2: Spigot with lip seal on both ends
AS: Spigot with lip seal and socket-type spigot on one end

Technical data

Nominal size: 80, 100, 125, 160, 200, 250, 315, 400, 450, 500, 560, 630, 710, 800 mm
Insulation thickness: 25, 50, 100 mm
Nominal length: 500, 1000, 1500 mm
Operating pressure: 2000 Pa max.
Airflow velocity: 20 m/s max.
Operating temperature: 90 °C max.

Sizing data

ØD [mm]
L [mm]
L₁ [mm]
q_v [m³/h]
D_e [dB]
Δp_st [Pa]

CAH	–	A2	/	D2	/	160	×	1000	/	50
\|		\|		\|		\|		\|		\|
1		2		3		4		5		6

1 Type
CAH Circular silencer

2 Material
No entry: galvanised steel (1.0917)
A2 Stainless steel (1.4301)

3 Type of connection
No entry: spigot with groove on both ends
D2 Spigot with lip seal on both ends
AS Spigot with lip seal and socket-type spigot on one end

4 Nominal size [mm]
80, 100, 125, 160, 200, 250, 315, 400, 450, 500, 560, 630, 710, 800

5 Nominal length [mm]
500, 1000, 1500

6 Insulation thickness [mm]
25, 50, 100

Order example: CAH–A2/D2/160×1000/50

Type	CAH
Material	Stainless steel (1.4301)
Type of connection	Spigot with lip seal on both ends
Nominal size [mm]	160
Length [mm]	1000
Insulation thickness [mm]	50

Dimensions and weigth, Installation details

Dimensions

Schematic illustration showing connection type AS

Dimensions

NS	ØD	Insulation thickness 25		Insulation thickness 50		Insulation thickness 100
NS	ØD	ØD₂	ØD₃	ØD₂	ØD₃	ØD₂	ØD₃
80	79	80	129	80	184
100	99	100	154	100	204	100	304
125	124	125	184	125	228	125	319
160	159	160	204	160	254	160	354
200	199	200	254	200	304	200	405
250	249			250	354	250	455
315	314			315	405	315	505
400	399			400	505	400	605
450	448					450	636
500	498					500	716
560	558					560	806
630	628					630	806
710	708					710	908
800	798					800	1008

No entry: spigot with groove to EN1506 ØD
D2: Spigot with groove to EN1506 ØD
AS: Spigot with lip seal ØD and socket-type spigot on one end ØD₂

Lengths

L_N	L	L₁
500	500	380
1000	1000	880
1500	1500	1380

Spiral duct casing: weights [kg]

NS	Insulation thickness 25		Insulation thickness 50			Insulation thickness 100
	LN
	500	1000	500	1000	1500	500	1000	1500
80	2	4	3	5
100	3	4	3	5		5	8
125	3	5	4	6		5	9
160	4	6	4	7		6	10
200	4	7	5	9		7	13
250			6	11	15	9	15	21
315			8	14	20	10	17	24
400			10	17	25	14	25	36
450							26	37
500							31	44
560								50
630								52
710								68
800								77

Plain casing: weights [kg]

NS	Insulation thickness 25		Insulation thickness 50			Insulation thickness 100
	LN
	500	1000	500	1000	1500	500	1000	1500
80	3	4	3	6
100	3	5	4	6		5	9
125	3	6	4	7		6	10
160	4	7	5	8		7	11
200	5	8	6	10		8	13
250			7	12	17	9	15	22
315			8	14	21	10	18	25
400			10	18	26	13	23	32
450							24	33
500							28	40
560								45
630								47
710								54
800								62

Installation and commissioning

Follow the installation manual and comply with the general codes of good practice in order to achieve the given performance data
Installation in ducts outside closed rooms requires sufficient protection against the effects of weather
Due to its weight the silencer must be supported, e.g. by a suitable fixing system.

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