CAH CIrcular Silencers

Spigot with groove

Spigot with lip seal

Socket-type spigot

CAH

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 characteristics

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

Material and surfaces

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

Perforated inner duct made of galvanised steel or stainless steel 1.4301
Spigot made of galvanised 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

Technical information

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

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 characteristics

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

Material and surfaces

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

Perforated inner duct made of galvanised steel or stainless steel 1.4301
Spigot made of galvanised 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

Downloads

product information

Product data sheet CAH

CAH_PD_2023_04_26_DE_en Product data sheet 260 KB pdf

certificates

Declaration of hygiene conformity CAH

CA_CAH_HC_2022_10_22_DE_en Declaration 680 KB pdf

operation manuals

Installation manual CAH

CAH_IM_A00000071256_V1_2023_01_GB_en Installation manual 560 KB pdf

References

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