Sound protection

experts since 1928

To protect the health of your staff, local residents and the environment, and to comply with legal requirements, your ventilation systems must not exceed the prescribed sound levels for operating noise.
If the necessary operating data produce excessive sound power, additional measures must be taken to reduce the sound transmission. To this end, HLU offers both standardised components and customer-specific bespoke solutions, calculated and manufactured based on setpoint values.

Sound enclosures made of plastic

Application
  • reduces the fan’s sound radiation
Features
  • sound level reduction approx. 10 dB at 250 Hz
  • available for fans of all types and series
Material PPs | Special materials optionally available
Atex
suitable for extraction from ATEX zone 2, optionally for ATEX zone 1 in electrically conductive version
Designbushings for air ducts, condensation outlets, electrical cables and crane eyes and machine feet are included

Advantages:

  • corrosion resistant
  • suitable for outside installation
  • supply and return air grilles for self-ventilation with dampened openings

Sound enclosures made of steel

Application
  • reduces the fan’s sound radiation
Features
  • sound level reduction approx. 10 dB at 250 Hz
  • available for fans of all types and series
Material galvanised steel, optionally in stainless steel
Design bushings for air ducts, condensation outlets, electric cables and crane eyes and fastening profiles for steel construction or floor installation are included

Advantages:

  • suitable for outside installation
  • supply and return air grilles for self-ventilation with dampened openings

Circular silencer

RSD

Application
  • for noise reduction in ventilation systems with small to medium flow rates
Features
  • volume flow from 20 to 8000 m³/h
  • available in 14 nominal diameters from 75 to 400 mm intake diameter
Volume flow 20 to 8.000 m³/h
Nominal diameters 14 nominal diameters from 75 to 400 mm
MaterialPPs, PVC | Special materials optionally available
Connection optionspipe, sleeve or flange connection

Advantages:

  • absorption material made of non-combustible mineral wool in accordance with DIN 4102, shrink-wrapped so it is abrasion resistant and moisture proof

Splitter sound attenuator

Application
  • for noise reduction in ventilation systems with small to large flow rates
Features
  • dimensions are calculated individually based on the volume flow and desired sound reduction
Nominal diameters dimensions are calculated individually based on the volume flow and desired sound reduction
Material PP, PPs, PE, PVC | Special materials optionally available
Atexsuitable for extraction from ATEX zone 2, optionally for ATEX zone 1 in electrically conductive version
Connection optionspipe, sleeve or flange connection

Advantages:

  • absorption material made of non-combustible mineral wool in accordance with DIN 4102, shrink-wrapped so it is abrasion resistant and moisture proof

Sound protection specifically for roof fans

Silencer for roof fans

Application
  • for sound attenuation in direct combination with HF roof fans: HF D …15 /17 D and HF D …-16 D
Features
  • available in 7 nominal diameters from 110 to 400 mm intake diameter
  • larger nominal diameters possible on request
Nominal diameters 7 nominal diameters from 110 to 400 mm | larger nominal diameters possible on request
Material PPs, PVC | Special materials optionally available
Atexsuitable for extraction from ATEX zone 2, optionally for ATEX zone 1 in electrically conductive version
Designvariable number of cable bushings (0, 1, 2) for flat or inclined roofs
Connection options pipe connection

Advantages:

  • absorption material made of non-combustible mineral wool in accordance with DIN 4102, shrink-wrapped so it is abrasion resistant and moisture proof

The following accessories are recommended for this product:

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