Duct liner

A duct assembly comprising:

• a first duct housing extending in a longitudinal direction and having an interior surface, an exterior surface, and a trailing end;
• a second duct housing extending in a longitudinal direction and having an interior surface, an exterior surface, and a leading end;
• a first duct liner secured to the interior surface of the first duct housing, wherein the first duct liner comprises:
• an insulation layer having a leading edge surface, a trailing edge surface that is spaced apart from the leading edge surface, a first face surface that extends from the leading edge surface to the trailing edge surface, a second face surface that is opposed to and spaced apart from the first face surface and that extends from the leading edge surface to the trailing edge surface, a first lateral edge surface that extends from the leading edge surface to the trailing edge surface, and a second lateral edge surface that is opposite the first lateral edge surface and that extends from the leading edge surface to the trailing edge surface;
• a facing disposed on the first face surface, such that the first face surface is entirely covered by the facing, and is disposed on the leading edge surface and the trailing edge surface, such that the leading edge surface and the trailing edge surface are entirely covered by the facing, and wherein two spaced apart strips of the facing are disposed on and cover a portion of the second face surface adjacent to the leading and trailing edges, such that a portion of the second face surface between the strips is uncovered by the facing;
• a second duct liner secured to the interior surface of the second duct housing, wherein the second duct liner comprises:
• an insulation layer having a leading edge surface, a trailing edge surface that is spaced apart from the leading edge surface, a first face surface that extends from the leading edge surface to the trailing edge surface, a second face surface that is opposed to and spaced apart from the first face surface and that extends from the leading edge surface to the trailing edge surface, a first lateral edge surface that extends from the leading edge surface to the trailing edge surface, and a second lateral edge surface that is opposite the first lateral edge surface and that extends from the leading edge surface to the trailing edge surface;
• a facing disposed on the first face surface, such that the first face surface is entirely covered by the facing, and disposed on the leading edge surface and the trailing edge surface, such that the leading edge surface and the trailing edge surface are entirely covered by the facing, and wherein two spaced apart strips of the facing are disposed on and cover a portion of the second face surface adjacent to the leading and trailing edges, such that a portion of the second face surface between the strips is uncovered by the facing;
• wherein the first duct housing and second duct housing are assembled in an end-to-end relationship such that the trailing end of the first duct housing is attached to the leading end of the second duct housing and the facing on the trailing edge surface of the first duct liner abuts the facing on the leading edge surface of the second duct liner.