6 inch Duct MufflerDuct Muffler is specially built to reduce vibration and sound upto 25 DBA created by fans and other equipment installed in the ductwork. In addition, this high performance device is fire resistant, non toxic, and made using commercial grade neoprene foam for sound deadening. The biggest benefit is that it does not create any airflow restriction. You can use this duct silencer outside and inside. It is also easy to install in the existing or new
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