Fibrous glass duct insulation means peace and quiet. It is a key contributor to the creation of an acoustically satisfying indoor environment by absorbing noise generated by central air equipment, by expansion and contraction of duct components, and from air movement noise within the ducts. It also contributes to personal privacy and productivity by preventing the ductwork from transmitting unwanted conversations from room to room in the home or workplace. No other forms of duct insulation, including elastomeric foams and reflective products, can match the acoustical effectiveness of fibrous glass insulation applied to control noise in air handling systems.