- Given the many constraints relating to environmental aspects and the exposure of your staff to noise in the workplace, Alhyange assists you in your process.  

Our studies cover the following areas:


At employers' requests, we measure their staff's exposure to noise..

We then model the workshop to determine the acoustic treatments required to reduce the sound level at the workstation and to improve the spatial decay of the noise in the workshop.


First of all, EPCI's are subject either to declaration or to authorisation. The applicable regulations are therefore numerous, depending on the headings concerned.

On inception or extension of a site, current regulations demand the creation of a report on the project's overall impact on its environment. Noise pollution from the project is one of a large number of topics covered. This type of impact study includes in particular an analysis of the initial state, a study of the impact of the project on its environment and finally, the recommendation of acoustic treatments which will allow the criteria to be met.

Furthermore, for those EPCI's subject to authorisation, periodic checks every two or three years after authorisation are mandatory, sometimes even annually, depending on prefectoral decrees or for companies complying with ISO 14 001.

Alhyange accompanies either the companies or the project managers to ensure this approach is respected and that current acoustic criteria are met.


Machinery noise studies include adherence to noise level criteria, in- or outdoor, caused by ventilation, air-conditioning, heating or plumbing, etc …

The main acoustic studies concern sound levels caused by ventilation or air-conditioning systems.

Thus, together with other research firms or air-conditioning installers, Alhyange studies "accidents" within the aeraulic systems and defines whether it is necessary or not to implement acoustic treatments such as silencers, plenum etc … These recommendations are in accordance with the site's constraints so as to comply with the specifications and/or current regulations.


Firstly, Alhyange studies with the companies the sound levels generated by machinery. With regard to ventilation and air-conditioning systems, our research department analyses "accidents" within aeraulic networks and assesses the need to implement acoustic treatments in accordance with both site constraints and current regulations.

In relation to the separation of machinery from the building structures, acoustic treatments are recommended according to the site's constraints (see under “vibrations”). Furthermore, third-party solutions are recommended for the reduction of noise emanating from machinery installed in the studied sites.


Some rotating equipment can cause vibration annoyance, due to poor insulation from the slab, or the proximity of two pieces of machinery, etc.

Thanks to its advanced tools, Alhyange carries out vibration measurements on the rotating equipment and on the building structure to find the cause of these annoyances and to be able to propose solutions.