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HVAC equipment for a building is one of the major sources of interior noise and its effect on the acoustical environment is important. Operation of HVAC equipment can also induce mechanical vibration that propagates into occupied spaces through structure borne paths such as piping, duct work and mounts. These vibrations can cause direct discomfort and also create secondary radiation of noise from vibrating walls, floors, piping, etc. Therefore, installing a suitable sound-absorbing liner inside the air ducts is an exceptionally effective way to reduce this air-borne noise and improve the acoustics in the building.