AudioSeal™ Pipe and Duct Lag is a 1 lb per sq. ft. mass loaded barrier with a reinforced foil facing. It is typically used to wrap noisy pipes and ducts to block the noise that transmits through the walls of the pipe or duct as air or other contents move through it as well as to increase the sound absorption in the cavity. The reinforced foil-faced exterior serves as a protective jacket for indoor or outdoor applications. It is easy to cut, wrap and install with matching lag tape. AudioSeal™ Pipe and Duct Lag is available in rolls 54" wide x 30' long.