4" Duct Muffler (760004)These fully assembled high-performance Duct Mufflers are non-toxic, fire-resistant, and use commercial grade acoustical neoprene foam made specifically for sound deadening. Connect them to your fan and ducting and reduce your noise output by up to 25dba without reducing airflow.
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Price: $29.44 / each
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— Ships from DL: Livermore, California USA.