NSL attenuators can be fitted to plant room apertures, acoustic enclosures/screens and ductwork systems to provide high levels of noise attenuation whilst maintaining airflow and pressure differentials. We provide both circular and rectangular options with a range of fixing details and finishes. Our attenuators can be provided with melinex lining for protection within systems where grease and/or moisture may be prevalent and we can provide access hatches for cleaning within rectangular systems.​