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Sound insulation by means of sound absorbers
RAL Community „Quality assurance association splitter attenuators“



The RAL Quality assurance association (founded in 1987) is a voluntary union of manufacturers with the aim of quality assurance based on uniform quality- and test regulations.

Member´s products are tested in an independent, officially approved test institute. These measuring data are the basis for catalogue specifications and analysis-software of the respective manufacturers.

The long-term quality assurance is carried out by rotational re-examinations and by the commitment of members to identically produce the type of splitter silencer which they had submitted to the initial testing. The compliance with all requirements is guaranteed by a transparent control system (external supervision).
After testing all requirements the Quality assurance association awards  the quality mark RAL-GZ 595.

The members are:

  • BerlinerLuft.Technik ltd.
  • Gerber Schallschutztechnik ltd.
  • H+H Schalldämpfer und Gerätebau ltd.
  • LBF Lufttechnik ltd.
  • Hans Prechtl ltd & Co. KG –LUFTTECHNIK-
  • SCHAKO KG Klima-Luft
  • SOLIDUX Gesellschaft für Schallschutz mbH & Co. KG

Sounds for demonstration purposes (mp3)

Download of sound without splitter type silencer  (444 kb)
     without silencer

Download of sound with splitter type silencer  (444 kb)
     with silencer (audible only with good headphones)