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