Aerial image of the built-over motorway section
Noise abatement measure A1
Cologne Lövenich
188 Labyrinth ventilator Hydra 4 x 6m
Hydra labyrinth ventilator in a glass roof
View from below of the sound absorber of the Hydra labyrinth ventilator in a glass roof
Hydra labyrinth ventilator in a glass roof