- Control noise to guarantee compliance
- Project background
- Technical and environmental constraints
- The Groupe BOËT acoustic solution
- Measured performance and results
- Impact on the sound environment and compliance
- Conclusion
Project background
The Le Chevalier site housed several rooftop HVAC units for ventilation and air conditioning of technical premises. However, acoustic measurements taken at the property boundary revealed that the regulatory thresholds set by the decree of January 23, 1997 on noise levels in residential environments had been exceeded.
This situation exposed the customer to legal risks and potential complaints from local residents. The project’s objective was therefore clear: to reduce noise emissions at source and guarantee sufficient sound attenuation to meet compliance thresholds.
Technical and environmental constraints
A site in a dense urban area
The equipment was located on a rooftop in a densely populated environment. The nearest facades were only a few meters away, amplifying the perceived acoustic impact. Any intervention therefore had to keep visual nuisance to a minimum and preserve the systems’ natural ventilation.
Regulatory and logistical issues
In addition to complying with noise thresholds, the project had to meet access and safety constraints linked to working at height. The installation of the acoustic screens required detailed coordination between BOËT teams, site operators and local authorities to guarantee safety, structural stability and subsequent maintenance of the equipment.
The Groupe BOËT acoustic solution
After acoustic diagnosis and simulation, Groupe BOËT designed a custom-made, high-damping acoustic screen, specifically adapted to the roof configuration and fan characteristics.
A design adapted to the site’s constraints
The acoustic screen has been dimensioned to offer an attenuation of over 25 dB(A), guaranteeing effective noise reduction at the facade. Its height and geometry were optimized using three-dimensional acoustic modelling to limit reflections and maximize effectiveness at low frequencies.
Materials and technical design
The acoustic panels selected combine a perforated galvanized sheet on the noise side, a high-density mineral wool filling (water-repellent and rot-proof) and an unperforated galvanized steel outer skin for mechanical protection. This choice guarantees enhanced durability and weather resistance on the roof.
The whole system is supported by a self-supporting structure with anti-vibration fixings, ensuring mechanical stability without altering the watertightness of the roof. The anchoring points have been designed so as not to interfere with the building’s technical elements.
Accessibility and maintenance
The system incorporates access hatches and removable modules to facilitate maintenance operations on HVAC equipment. This approach guarantees continuity of operation while maintaining acoustic performance over time.
Measured performance and results
Once the acoustic screens had been installed, acoustic measurements were taken on the facades of the nearest homes. The results showed an average reduction of 10 to 12 dB(A) at the property line, bringing the noise level into compliance with regulations.
- Total regulatory compliance: emergence thresholds are now respected.
- Significant reduction in perceived noise: local residents no longer perceive HVAC noise emissions.
- Preserved aeraulic stability: system airflow remains optimal.
The site is now operating smoothly, with no risk of complaints or administrative sanctions.
Impact on the sound environment and compliance
The implementation of this solution demonstrates the effectiveness of Groupe BOËT’s acoustic equipment in complex contexts. By combining expertise in industrial acoustic studies, mastery of acoustic dimensioning and site experience, the Group ensures measured, verifiable and lasting results.
This project is part of the Groupe BOËT’s global approach to acoustic protection and environmental noise reduction for industrial companies, local authorities and the service sector.
In conclusion
The Le Chevalier project illustrates the Groupe BOËT ‘s ability to offer tailor-made acoustic solutions that reconcile performance, reliability and respect for urban constraints. Thanks to rigorous design, high-performance materials and controlled integration, the Group was able to restore noise compliance while ensuring continuity of operation.
Would you like to reduce the noise from your HVAC or industrial installations?
Contact Groupe BOËT for a personalized acoustic study and the implementation of noise reduction solutions tailored to your needs.
