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. The air is drawn in on the side of the boxes, flows 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 in the plate. Two birds with one stone.