When one is looking to a noise reduction by the means of a silencer, ITS offers a wide range of sound attenuators for industrial fans for many applications related to acoustic insulation / soundproofing: protection of workers against noise, preservation of acoustic environment, limitation of noise emissions in the energy sector, testing rooms acoustics, acoustic comfort in buildings.

Range of applications 

  • reduction of sound transmission in a duct, a pipe or an opening, without preventing air transportation


  • excellent technical characteristics and robustness
  • ease of implementation (easy assembly/disassembly)
  • high adaptability of acoustic performance
  • wide range of possible applications (in addition to fans noise reduction) such as on the occasion of the construction of enclosures and machines soundproofing housings, the construction of cabins, the ventilation of technical premises as well as of equipments for the production of electrical (resp. thermal or cooling) energy, or for the air admission of test rigs or acoustic testing rooms, the ventilation or air conditioning of buidlings ...


  • envelope generally rectangular (sometimes circular in case of silencer for air ducting works for example), metallic, single or double shell (perfect mechanical resistance over time) if required with an upstream connecting flange and with a downstream connecting flange and ( for some applications) with thermal, acoustic or thermoacoustic outer insulation
  • splitters (sometimes called: baffles) generally parallelepipedic (except for silencers with a circular cross section), with metallic frames and structures
  • thickness, filling (usually mineral wool: polyester wool or other for special applications), finishes, free open area, geometry of upstream and downstream ends: adapted depending on the desired performance


  • in case of a sound attenuator for industrial fans with a rectangular cross section, the soundproofing device is in the form of a box-piece generally monobloc

Standard constitution (for rectangular cross section)

  • casing made of galvanized sheet steel, thickness according to performance requirements, possibly with powder coating (other finishes on request) with connecting flanges upstream and downstream
  • splitters (sometimes called: baffles) rectangular, with galvanized steel frames, with a profiled upper extremity for back pressure limitation
  • filling made of medium density rock wool with a cover made of glass cloth or a glass fabric (in some cases)
  • perforated facing made of galvanized steel sheet, thickness according to performance requirements (other finish upon request)


  • composition for special applications (e.g. clean rooms)
  • splitters for dissipative silencer or reactive silencer: resonant silencer (with resonant plates / foils)


  • Casing (when not made of stainless steeel):for typical applications, the noise reduction devices for industrial fansare protected by a multilayer coating system in accordance with ISO 12 944 C2, with high durability (above 15 years);for more demanding applications, the noise reduction devices for industrial fansare protected by a multilayer coating system in accordance with ISO 12944 C4 or even C5 with high durability (above 15 years)
  • Splitters:for typical applications: metal parts with galvanisation;for more demanding applications: metal parts made of stainless steel

Weather resistance 

  • indoor or outdoor use in normal environments (other finish for different uses: on request)

Fire behavior (reaction to fire of ingredients according to standard NF F16-101):

  • siding:galvanized finish: rating M0;powdercoating finish: rating M1
  • filling:rock wool: rating M0;polyester: rating M1


  • in case of a filling made of rock wool, a glass cloth prevents grinding
  • in case of a filling made of polyester, no surface treatment is necessary, the filling being not subject to grinding (due to a surface microfusion) and being not in a position of releasing biopersistent material
  • whatever the filling is, the noise reduction devices for industrial fanscontain no element favorable to microbial growth

Acoustic performance 

  • measured / simulated according to ISO 7235 Acoustics - Laboratory measurement procedures for ducted silencers and air-terminal units - Insertion loss, flow noise and total pressure loss. Non standard performance can be obtained by the means of special constructions


  • on the occasion of the construction of industrial soundproofing equipment

Associated products and services (on request) 

  • structures/frames, delivery as a kit with assembly instructions (national and international). Complete study. On-site installation (national and international)
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ITS offers sound attenuators for industrial fans for industrial fans for the preservation of inner and outer acoustic environment of plants and power stations.

All equipment that one can source thanks to Isolation Technologie Services (ITS).