ATCO does not have a duct specially designed to reduce noise within the duct system. However, ATCO does have independent test data on the acoustical properties of our standard products. The data shows Net Insertion Loss on 10′ lengths of different diameters of ATCO duct, as compared to sheet metal duct. Tests were done on straight lengths, and duct with a 90 degree bend, with and without airflow, and are recorded at a variety of octave bands. Click here to download the acoustical information on our products.