Round Sound Attenuator SAC Series

Type SAC attenuators are available in a size range based upon ISO standards. Two lengths are catalogued, nominally equivalent to one times inside duct diameter with increased lengths available where higher acoustic performance is required. Alternative sizes and end connection types can be provided. Standard attenuator casings are manufactured from galvanized sheet metal Ga.20 minimum. Casings are constructed with grooved seams with a mastic sealant; casing thickness complies with SMACNA standards and DW 144 Class B ductwork code. End plates contain threaded inserts M6-M10 as standard depending upon attenuator size. The attenuators contain acoustic infill has a glass cloth facing and is contained behind galvanized perforated sheet metal; this dual protection prevents damage and fibre erosion up to 30 m/s airway velocity.