Fabrication-tolerant ventilated acoustic barrier for practical implementation

We present a practical ventilated acoustic barrier that places discrete resonant elements at the center, reserving the surrounding region for continuous wave propagation. This inverted layout facilitates installation and reduces sensitivity to fabrication imperfections while preserving both acoustic insulation and ventilation. The metamaterial exploits Fano-like interference between the central and peripheral paths to achieve broadband noise attenuation and ventilation. We performed analytical modeling, numerical simulations, and experimental measurements, all of which confirmed transmission loss exceeding 10 dB across the 850-1450 Hz range, with an open area ratio of 0.3 ensuring sufficient airflow. By combining acoustic performance with structural practicality, the proposed design offers strong promise for real-world applications, including architectural acoustics, mechanical rooms, and household appliances.