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Cleanroom Air Distribution Systems
Rectangular Duct Silencer
A straight rectangular sound attenuator with aerodynamic splitters that absorbs fan and airflow noise within the duct path.
- Aerodynamic Acoustic Splitters
- Straight-Through Air Path
- Perforated Protective Liners
- Cleanroom Media Options
Product Introduction
A rectangular duct silencer places parallel acoustic splitters inside a sealed galvanized casing. Perforated metal faces expose sound energy to the protected absorptive media while maintaining a defined straight airflow passage. Splitter thickness, air gap and overall length are selected to balance insertion loss against system pressure drop. For hygiene-sensitive air, polymer film liners or packless resonant construction isolate fibrous media from the airstream.
Key Features
Aerodynamic noses and tails reduce turbulence where air enters and leaves each baffle.
Perforated metal or film-protected faces prevent erosion of acoustic fill into the air stream.
Low-, medium- and high-velocity configurations match different pressure-drop allowances.
Customer Product Concerns
A duct silencer must reduce the relevant frequency bands without consuming the fan pressure needed for filters and terminal devices.
Fan blade-pass noise travels directly through the supply main.Selected splitter spacing and length absorb energy in the dominant octave bands.
A restrictive silencer increases fan energy and reduces cleanroom airflow.Air-gap area and aerodynamic splitter profiles are sized for the scheduled face velocity.
Fibrous acoustic media is unacceptable in a critical supply stream.Film-lined or packless construction isolates or eliminates exposed fibrous fill.
The silencer casing leaks around splitter penetrations and seams.Sealed outer construction maintains the same leakage duty as the connected duct system.
Typical Applications
Air-handling-unit discharge noise controlCleanroom supply-air mainsLaboratory exhaust systemsFan intake and outlet plenumsMechanical-room duct penetrations
Technical Parameters
Representative construction ranges for a rectangular HVAC duct silencer are summarized below.
| Core Material | High-density glass fiber, mineral wool or packless resonant acoustic elements |
|---|---|
| Panel Thickness | 100–300 mm acoustic splitter thickness |
| Effective Width | 200–1600 mm duct connection width |
| Maximum Length | 600–2400 mm silencer casing length |
| Steel Facing Thickness | 0.8–1.2 mm galvanized casing and perforated liner |
| Core Density | 32–64 kg/m³ absorptive acoustic media |
| Thermal Conductivity | 0.034–0.041 W/(m·K) for straight-splitter absorptive fiber media |
| Surface Finish | G90 galvanized casing with perforated galvanized, film-lined or stainless airstream faces |
| Joint Type | Rectangular flange connection matched to duct size with sealed casing seams |
| Customization | Available based on the intended application and operating environment. |
Available Options
Absorptive, film-lined or packless constructionGalvanized, aluminum or stainless casingLow-, medium- or high-velocity splitter geometryExtended casing for enhanced low-frequency attenuation
Planning a Rectangular Duct Silencer specification?
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