NOVELTY - The duct liner comprises an insulation layer (12) and a facing (14). The insulation layer comprises a first edge surface (16), a second edge surface (18) that is spaced apart from the first edge surface, and a first face surface (20) and a second face surface that extend from the first edge surface to the second edge surface. The second face surface is opposed to and spaced apart from the first face surface. The facing is arranged on the first face surface, such that the first face surface is entirely covered by the facing.    USE - The duct liner is useful in a duct assembly (claimed) that is used to convey air in a heating, ventilation, and air-conditioning system.    ADVANTAGE - The duct liner enhances the acoustical and/or thermal performance of the ducts.    DETAILED DESCRIPTION - The duct liner comprises an insulation layer (12) and a facing (14). The insulation layer comprises a first edge surface (16), a second edge surface (18) that is spaced apart from the first edge surface, and a first face surface (20) and a second face surface that extend from the first edge surface to the second edge surface. The second face surface is opposed to and spaced apart from the first face surface. The facing is arranged on the first face surface, such that the first face surface is entirely covered by the facing. The facing is arranged on the first and second edge surfaces, such that the first and second edge surfaces are entirely covered by the facing. Two spaced apart strips of the facing are arranged on and cover a portion of the second face surface adjacent to the first and second edge surfaces, such that the portion of the second face surface between the strips is uncovered by the facing. The facing is adhered to the first and second edge surfaces of the insulation layer. The strips are adhered to the second face surface. The facing is adhered to the insulation layer by ultrasonic welding and mechanical fasteners and with an adhesive. The adhesive comprises formaldehyde free binder, water base adhesive, one part adhesive, two part adhesive, powder adhesive, hot melt adhesive, thin film adhesives, and a spunbond hot melt adhesive web. The facing comprises a single sheet of material or multiple sheets of material. The facing is prefolded such that the facing includes a predefined central portion that covers the first face surface, a pair of predefined edge covering portions placed on opposite sides of the predefined central portion, and the pair of strips is predefined and extends from the pair of predefined edge covering portions. INDEPENDENT CLAIMS are included for:    (1) a duct assembly; and    (2) a method for making a duct liner.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a duct liner.    Insulation layer (12)    Facing (14)    First edge surface (16)    Second edge surface (18)    First face surface. (20)