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 |
| Design | bushings 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 |
| Material | PPs, PVC | Special materials optionally available |
| Connection options | pipe, 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 |
| Atex | suitable for extraction from ATEX zone 2, optionally for ATEX zone 1 in electrically conductive version |
| Connection options | pipe, 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 |
| Atex | suitable for extraction from ATEX zone 2, optionally for ATEX zone 1 in electrically conductive version |
| Design | variable 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:
Sleeve with VA tightening straps