Rectangular and Circular Attenuators

Absorptive Noise Control for Industrial Ventilation and Process Air Systems

Description
Technical Data

Burgess-Manning rectangular and circular attenuators are industrial duct attenuators designed to reduce noise traveling through ducted ventilation and process air systems while maintaining the airflow performance of the system. Each attenuator directs airflow between a series of internal acoustic splitters containing absorptive materials, which absorb sound waves from the airstream as air passes through the unit.

Rectangular attenuators are designed for square and rectangular ductwork systems and use parallel baffle configurations to provide noise reduction across the frequency spectrum of the source noise. External casings are designed to withstand internal duct pressures while reducing breakout noise and protecting against corrosion appropriate to the installation location.

Circular attenuators are designed to match round ductwork systems and feature a central acoustic pod surrounded by acoustically absorbent lining within a circular outer steel casing. Both configurations are available for high-pressure and low-pressure systems.

Both configurations are custom-engineered using detailed acoustic analysis to meet project-specific noise reduction requirements, pressure drop allowances and duct geometry constraints. Attenuators are sized based on plant airflow requirements to ensure minimal back pressure on the ventilation system.

Rectangular Attenuator Construction: Outer steel casing designed to withstand internal duct pressures, with internal acoustic splitters containing absorptive material. Parallel baffle configuration sized to meet noise reduction and airflow requirements. External casing is corrosion-protected to suit the installation environment.

Circular Attenuator Construction: Central acoustic pod surrounded by acoustically absorbent lining within a circular outer steel casing, designed to match round ductwork systems. Available for high-pressure and low-pressure applications.

Corrosion Protection: External casing is designed to protect against corrosion appropriate to the installation location and environment.

Noise Reduction: Double banked attenuators can provide up to 20 to 25 dB of noise reduction depending on the frequency spectrum of the source noise. Units are available in a number of depths to suit project requirements.

Back Pressure: Attenuators impose a back pressure on the fan or blower in the system, which must be accounted for as part of the overall system design. Where attenuators are retrofitted into existing systems, care must be taken to ensure the unit offers minimal pressure loss so that airflow rates are not significantly reduced.

Applications: Industrial ventilation systems, exhaust systems, process air applications and air input systems for small and large-scale industrial installations across oil and gas, power generation and general industrial sectors.

Minimum Information Required For Getting A Quote

Duct dimensions and shape (rectangular or circular)
Required noise reduction in dB by octave band
Airflow volume and velocity
Maximum allowable pressure drop
Installation orientation (vertical or horizontal)
Site environment and corrosion category
Applicable design codes

Rectangular and Circular Configurations

Burgess-Manning attenuators are available in both rectangular and circular configurations to match existing ductwork geometry, eliminating the need for duct transitions and minimizing installation complexity.

AirFlow Performance

Each attenuator is sized based on plant airflow requirements to ensure minimal back pressure on the ventilation system, maintaining airflow performance while reducing noise transmission through ducted systems.

Custom Acoustic Design

Attenuators are custom-engineered using detailed acoustic analysis to meet project-specific noise reduction targets, duct geometry requirements and pressure drop constraints for both new installations and retrofit projects.

Relevant Industries

Oil and gas refineries, natural gas processing plants and LNG facilities represent remarkably intensive and acoustically challenging industrial environments, generating intense noise levels from complex processing equipment, high-pressure systems and continuous operations. Hydrocarbon processing facilities require comprehensive noise control solutions to ensure worker safety, regulatory compliance, community relations and operational efficiency.

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Power plants generate both energy and significant acoustic energy. Excessive noise can endanger employees, affect equipment longevity and violate local and international regulations. Burgess-Manning custom-engineers silencers for turbines, compressors, blowers, generators and transformers.

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Industrial applications generate considerable noise as a result of high-capacity machinery, continuous operations and complex infrastructure. Without proper noise control, these environments can pose risks to employee health, disrupt surrounding communities and violate environmental and occupational noise regulations. Implementing tailored noise mitigation solutions of acoustic walls, noise barriers and silencers while utilizing acoustic modeling, CFD, FEA and noise measurements to design solutions not only supports safety, but also enhances operational efficiency and community relations.

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Rectangular and Circular Attenuators FAQ

A silencer baffle is an absorptive noise control product designed to reduce noise traveling through ducted gas or airflow systems. Each unit consists of an outer steel casing containing a series of vertically aligned acoustic splitters or baffles filled with absorptive materials. Airflow passes between the baffles while sound waves are absorbed into the acoustic media, reducing noise at air intakes, exhausts and through ductwork systems.

Silencer baffles and attenuators direct airflow between a series of internal acoustic splitters containing absorptive materials. Sound waves from the airstream enter the acoustic media and are absorbed while airflow continues through the unit. Units are sized based on the required level of noise reduction and the airflow volume required to pass through the system.

Attenuators impose a back pressure on the fan or blower in the system which must be accounted for as part of the overall system design. Where attenuators are retrofitted into existing systems care must be taken to ensure the unit offers minimal pressure loss so that airflow rates are not significantly reduced.

Burgess-Manning rectangular and circular attenuators are used in industrial ventilation and exhaust systems and process air applications for both small and large-scale installations across oil and gas, power generation and general industrial sectors. Both configurations are available for high-pressure and low-pressure systems.

Rectangular attenuators use parallel baffle configurations and are suited to square and rectangular ductwork systems. Circular attenuators are designed to match round ductwork and feature a central acoustic pod surrounded by absorptive material within a circular casing. Both types reduce noise from industrial ventilation and air movement systems while allowing airflow to pass through.

Double banked attenuators can provide up to 20 to 25 dB of noise reduction depending on the frequency spectrum of the source noise. Units are available in a number of depths to suit project-specific noise reduction and airflow requirements.

Yes. Burgess-Manning rectangular and circular attenuators can be retrofitted into existing ductwork systems. Where attenuators are retrofitted, care must be taken during the design stage to ensure the unit offers minimal pressure loss so that airflow rates in the existing system are not significantly reduced.