Noise Attenuation – Engineering a dB Reduction for a Niro Dryer
Industrial drying equipment is essential in food, beverage and pharmaceutical manufacturing — but it often comes with one major challenge: noise. High sound pressure levels from dryer exhaust systems can pose serious compliance, safety and community impact issues if not properly managed.
At Noreside Engineering, we were recently tasked with delivering a bespoke noise attenuation solution for a Niro Dryer chimney outlet that was operating at approximately 120 decibels. Our client required a reduction to 80 decibels, without altering the existing dryer or building structure.
This project called for a fully engineered, turnkey solution — from concept and acoustic modelling through to fabrication and installation.
A Bespoke, Turnkey Noise Reduction System
The brief was clear: design and install a noise attenuation unit that could be fitted directly over the existing chimney outlet while achieving a significant decibel reduction.
Our in-house design team worked closely with an independent acoustic specialist to develop a solution capable of meeting the required sound performance. Using acoustic modelling and real-world operating data, we engineered an attenuation system specifically tuned to the noise profile of the Niro Dryer exhaust.
The final design achieved the target reduction from 120 dB to 80 dB while maintaining airflow performance and operational efficiency.
Engineering, Design and Structural Assurance
To give the client complete confidence in the solution, Noreside supplied a full set of 3D drawings along with a detailed technical report outlining how the attenuation performance would be achieved.
In addition, we produced full structural drawings to ensure the new attenuation unit could be safely supported by the existing building structure. This ensured compliance with structural loading requirements and eliminated the need for costly building modifications.
Where required, the system can also be supplied with a mist dampener fitted to the outlet of the attenuation box, helping to manage exhaust conditions and further improve performance in sensitive environments.
Designed for Compliance and Long-Term Performance
This project highlights Noreside Engineering’s ability to deliver bespoke, compliance-focused solutions for complex industrial challenges. By combining acoustic expertise, mechanical design and structural engineering, we deliver systems that work — and last.
View Manufacturing Drawings:
Noise Box Assembly
Insulation Perforated Panels
Full Assembly
Frequently Asked Questions
What is a noise attenuation unit?
A noise attenuation unit is an engineered enclosure or system designed to reduce sound levels emitted from industrial equipment such as dryers, fans or exhaust chimneys.
How much noise reduction can be achieved?
This depends on the application, but in this case the system achieved a 40 decibel reduction, from 120 dB down to 80 dB.
Can an attenuation unit be fitted to existing equipment?
Yes. This system was specifically designed to fit over an existing chimney outlet with no modification to the dryer itself.
Will noise attenuation affect airflow or performance?
When properly engineered, no. Our designs are developed to maintain airflow while achieving the required acoustic performance.
Do you provide full design and installation?
Yes. Noreside delivers full turnkey solutions including acoustic coordination, 3D design, structural analysis, fabrication and installation.
What is a noise attenuation unit?
A noise attenuation unit is an engineered enclosure or system designed to reduce sound levels emitted from industrial equipment such as dryers, fans or exhaust chimneys.
How much noise reduction can be achieved?
This depends on the application, but in this case the system achieved a 40 decibel reduction, from 120 dB down to 80 dB.
Can an attenuation unit be fitted to existing equipment?
Yes. This system was specifically designed to fit over an existing chimney outlet with no modification to the dryer itself.
Will noise attenuation affect airflow or performance?
When properly engineered, no. Our designs are developed to maintain airflow while achieving the required acoustic performance.
Do you provide full design and installation?
Yes. Noreside delivers full turnkey solutions including acoustic coordination, 3D design, structural analysis, fabrication and installation.
Inside a Precision Robotic Automation Cell at Noreside Engineering