METAVENT

The MetaVENT project addresses the pressing challenge of reducing
low-frequency noise generated by Heating, Ventilation and Air
Conditioning (HVAC) systems in modern vehicles. In conventional cars,
engine noise partially masks the sound of HVAC units; however, in
electric vehicles this masking effect is absent, making HVAC noise a
more dominant and disturbing contributor to the acoustic environment
of the cabin. Traditional noise control solutions, such as foams and
liners, become ineffective below 1000 Hz unless significant thicknesses (often greater than 50 mm) are used, which are incompatible with the limited space available in automotive ducts.