The PETAC ® material has a double effect here. On the one hand it solves the acoustic problem and on the other hand it provides silent ventilation. If you are in a box you have to get enough fresh air. The air is drawn in on the side of the boxes, runs upwards behind the PETAC ® material and is extracted there.
To provide top acoustic performance, PETAC ® also serves as a noiselock. The material absorbs inside, but also ensures that the sound waves from the outside are collected behind the PETAC ® and absorbed into the plate. Two birds with one stone.