Ventilation systems often carry fan noise, equipment noise and airflow turbulence from one zone to another. In factories, offices, hospitals, hotels, auditoriums and commercial buildings, this can create unwanted background noise at terminals, grilles, AHUs, FAHU lines and fresh air ducts. A properly planned duct silencer helps reduce transmitted noise while maintaining functional airflow and practical system performance. The right solution depends on the duct layout, air velocity, pressure drop tolerance and the surrounding acoustic condition.