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For the reduction of noise in circular ducts, flexible aluminium construction

Circular silencers, of a flexible aluminium construction, for the reduction of noise in the circular ducts of ventilation and air conditioning systems

The sound absorbing 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
Casing and perforated inner duct made of aluminium
Variant with spigot has a groove for a lip seal, suitable for circular connecting ducts to EN 1506 or EN 13180
Insertion loss measured according to ISO 7235
Casing air leakage to EN 15727, class D

Optional equipment and accessories

Socket-type spigots on both ends
Raised edges at both ends
With lip seals on both ends

SKU: CF Category: Circular Silencers Tag: CF

General Information

Application

Flexible circular silencer for the reduction of noise in the circular ducts of ventilation and air conditioning systems
For the reduction of air-regenerated noise of air terminal units LVC, TVR, TVE and of mechanical self-powered control units 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
Very flexible and consequently suitable for installation in complicated duct systems and restricted spaces
The sound absorbing material is non-combustible
Insulation thickness 1 in or 2 in
Smallest bend radius 3 × outer diameter ØD₃

Nominal sizes

3, 4, 5, 6, 8, 10, 12, 16 in

Variants

025: Circular silencer with 1 in insulation
050: Circular silencer with 2 in insulation
AS2: Circular silencer with socket-type spigots on both ends
BK2: Circular silencer with raised edges at both ends

Parts and characteristics

Casing
Perforated inner tube
Absorption material

Accessories

VD2: With lip seals on both ends
AS2: Socket-type spigots on both ends
BK2: Raised edges at both ends

Construction features

Circular casing
Flexible construction
Spigot suitable for circular ducts to EN 1506 or EN 13180
Spigot with groove for lip seal
Max. operating pressure 4.02 in w.g.
Max. operating temperature 212 °F

Material and surfaces

Casing and perforated inner duct made of aluminium
Lining is mineral wool
End pieces made of aluminium

Mineral wool

To EN 13501, fire rating Class A1, non-combustible
RAL quality mark RAL-GZ 388
Non-hazardous thanks to high biosolubility according to the German Ordinance on Hazardous Substances and Note Q of the European Regulation (EC) No. 1272/2008
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

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

Specification Text

Specification text

Circular silencers for ventilation and air conditioning systems, flexible construction, available in 8 nominal sizes. Insertion loss measured according to ISO 7235. Casing with acoustic and thermal insulation. Spigot with lip seal for circular ducts according to EN 1506 or EN 13180. Casing leakage to EN 15727, class D.

Special features

Insertion loss measured according to ISO 7235
Very flexible and consequently suitable for installation in complicated duct systems and restricted spaces
The sound absorbing material is non-combustible
Insulation thickness 1 in or 2 in
Smallest bend radius 3 × outer diameter ØD₃

Material and surfaces

Casing and perforated inner duct made of aluminium
Lining is mineral wool
End pieces made of aluminium

Mineral wool

To EN 13501, fire rating Class A1, non-combustible
RAL quality mark RAL-GZ 388
Non-hazardous thanks to high biosolubility according to the German Ordinance on Hazardous Substances and Note Q of the European Regulation (EC) No. 1272/2008
Inert to fungal and bacterial growth

Technical data