Owens Corning QuietR rotary duct liner absorbs noise within sheet metal ducts and contributes to indoor comfort by lowering heat loss or gain through duct walls. Owens Corning QuietR AcousticR duct Liner is a bonded blanket of glass fibers designed to be installed inside sheet metal ductwork and plenums with metal fasteners and adhesives. The smooth, fire-resistant airstream surfaces resist damage during installation and in service. QuietR AcousticR duct liner complies with requirements of Natio nal Fire Protection Association Standards NFPA 90A and 90B, qualifying it under other model codes.