Rectangular 90-degree elbow silencer with curved acoustic baffles

Cleanroom Air Distribution Systems

Rectangular Elbow Silencer

A 90-degree rectangular sound attenuator with radiused acoustic baffles that combines airflow turning and noise reduction where straight duct length is limited.

90-Degree Space-Saving Form
Radiused Acoustic Baffles
Combined Turning and Attenuation
Multiple Airstream Liner Options

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Product Introduction

The rectangular elbow silencer integrates curved acoustic baffles into a 90-degree duct bend. The change in direction blocks direct line-of-sight noise propagation and provides strong mid-frequency attenuation within a compact footprint. Internally radiused splitters guide airflow through consistent passages to limit separation and pressure loss. Absorptive, film-lined or packless baffle construction is selected according to the cleanliness and acoustic requirements of the air system.

Key Features

The 90-degree geometry fits acoustic treatment into plant rooms that lack a long straight duct section.

Radiused splitter passages turn the airflow while avoiding abrupt square-corner recirculation zones.

Eliminating direct line of sight improves attenuation through the mid and higher frequency range.

Film-lined and packless versions support hygiene-sensitive or fiber-restricted air streams.

Customer Product Concerns

A compact acoustic elbow must maintain uniform passage velocity through the bend; poorly shaped baffles can trade noise reduction for excessive pressure and generated noise.

There is no straight run available for a conventional sound attenuator.The elbow unit performs the required 90-degree turn and acoustic treatment in one component.

A square elbow separates airflow and creates its own low-frequency rumble.Radiused baffles maintain smoother velocity distribution around the bend.

Direct fan noise passes through an ordinary turning-vane elbow.Acoustic baffles interrupt line of sight and absorb sound along each curved passage.

Exposed fibers are unsuitable downstream of final filtration.Film-protected or packless internal construction keeps the airstream free of exposed absorptive fill.

Typical Applications

Compact cleanroom air-handler outletsMechanical-room duct turnsLaboratory exhaust risersFan intake elbowsNoise-sensitive ceiling service zones

Technical Parameters

Typical construction ranges for a rectangular 90-degree elbow sound attenuator are listed below.

Core Material	Glass-fiber acoustic media, mineral wool or packless resonant baffle construction
Panel Thickness	100–250 mm curved acoustic baffle thickness
Effective Width	300–1600 mm rectangular connection width
Maximum Length	900–2700 mm overall elbow leg dimension
Steel Facing Thickness	0.8–1.5 mm galvanized casing and perforated baffle liner
Core Density	32–64 kg/m³ absorptive media where used
Thermal Conductivity	0.035–0.043 W/(m·K) for formed elbow-baffle acoustic media
Surface Finish	G90 galvanized outer casing with perforated, polymer-film or packless internal surfaces
Joint Type	Flanged 90-degree rectangular connections with sealed casing and radiused splitter ends
Customization	Available based on the intended application and operating environment.

Available Options

Absorptive, film-lined or packless bafflesGalvanized, aluminum, 304 or 316 stainless casingExtended casing and transitionsForward-flow or reverse-flow optimized geometry

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