Acoustic Louver



An acoustic louver creates the ideal acoustic barrier in ventilation apertures in structures, and is suitable for several applications as air inlets and outlets in both processing plants or naturally ventilated areas. In addition, louvers can be used as screening walls around ventilated enclosures in processing-/air conditioning-/or electrical generator plants. Available options with the louvers are bird mesh, water trap and flange connection which should be specified separately. The SRI2 type is best suited for indoor use where the impact on weather conditions is minimal.

Material and dimensions:

The dimensions of a louver should not exceed 7m2 due to practical considerations, and if larger sizes are required a multi-sectioned solution should be used instead. Minimum size of a louver is recommended to be 1m2. The material alternatives available for the louvers are: pre-galvanized steel, aluminium and stainless steel. Painted finish of the louver is available upon request. The insulation material used consists of non-toxic and non-combustible mineral wool, and is firmly covered by polyester or glass fibre cloth and a perforated plate.

Noise data:

Noise data for the louver is available according to the following standards:

  • SFS-EN ISO 140-3:1995(1): " Measurement of sound insulation in buildings and of building elements - Part 2:1991 Determination, verification and application of precision data. - Part 3:1995: Laboratory measurements of airborne sound insulation of buildings elements."
  • SFS-EN ISO 717-1:1996(2): " Rating of sound insulation in building and of building elements - Part 1:1996 Airborne sound insulation."
  • ISO 5219:1984: "Air distribution and air diffusion - Laboratory aerodynamic testing and rating of air terminal devices."
  • ISO 5135:1997: "Determination of sound power levels of noise from air-terminal devices, air terminal units, dampers, valves by measurement in reverberation room."

The sound reduction achieved by a louver is heavily dependent on the sound field and by the surrounding arrangement. This is why measurements on site will often vary from laboratory measurements, because the louver on site will be affected by factors as flanking noise, background noise, vibration etc. In order to get the best possible result, please contact Acoustics for accurate noise calculations for your particular need. For more information on self-generated noise for the acoustic louver, please contact Acoustics.