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Spigot with groove

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Spigot with lip seal

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Socket-type spigot

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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 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


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.: +7 495 221-5161 | Fax: +7 495 221-5171