NOISE ATTENUATED AIR DUCT
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Feb 13, 2015
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Feb 14, 2014
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An air duct having an outer surface enclosing an inner space, said inner space in contact with an inner surface of said air duct; said inner surface equipped with air flow obstacles or impediments to create eddys and back flows and reduce noise transmission of air as it travels along the length of the duct.
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