The circular silencer Type CF is the flexible construction of Type CS.
The circular silencer with a high degree of flexibility means that they can be fitted in complicated duct systems and in restricted spaces.
The non-combustible acoustic material is available in insulation thicknesses of 25 mm or 50 mm.

Constructional features

• Circular silencer in flexible construction
• Insertion loss tested according to DIN EN ISO 7235
• Casing air leakage complies with DIN EN 1751, class A.
• Construction with spigot connections suitable for circular connecting ducts to DIN EN 1506 or DIN EN 13180 with groove for lip seal (if lip seals are required, these will be factory fitted)

Materials

• Outer casing and inner duct are aluminium
• Lining is mineral wool conforming to DIN 4102, fire rating class A2, with RAL quality mark RAL-GZ 388, bio-degradable as defined by TRGS 905 and EU directive 97/69/EG
• Mineral wool faced with fibreglass as protection against erosion suitable for air velocities up to 20 m/s