Various types of silencers are available to make technical installations sound-proofing. Type CD-60 has a slat step of 60mm and is available in two different depths (200 and 400mm). The whole is made of steel galvanized plating and provided with a sound absorbing Compro-Rock filling. This damper is applicable behind all types of ventilation louvres.
The CD-60/200 has an Rw value of 13 dB.
The CD-60/400 has an Rw value of 19 dB.
For specifications see the appendices.