Article R4213-5 of the French Labour Code
Premises in which work equipment likely to expose workers to a daily noise exposure level of more than 85 dB(A) is to be installed must be designed, built or fitted out, taking into account the state of the art, in such a way as to : 1° Reduce the reverberation of noise on the walls of these premises when this reverberation causes a significant increase in the level of exposure…