TS-CD, TS-CD+CS circular duct silencers are used to prevent the passage of sound between ducts and chambers, to reduce the sound intensity caused by friction elements and air decompensating air. The outer casing is made of galvanised sheet material, the inner surface is perforated and glass wool or mineRAL wool is used between the two surfaces. Decal is used as material from galvanised sheet metal. The standard length of the silencer is 450-950-1450 and 1950 mm, depending on the connection diameter. The RSA-2 series is used for diameters of ø400 and above, and the bottle of this series has a rectangular perforated sheet metal baffle which is covered with an insulating material.

It is available in two basic types: with circular concen- tric splitter (TS-CD+CS) and without splitter (TS-CD).