These Duct Mufflers use commercial grade acoustical neoprene foam made specifically for sound deadening. They're fully assembled, high-performance, and when connected to your fan and ducting, reduce your nois"¦These Duct Mufflers use commercial grade acoustical neoprene foam made specifically for sound deadening. They're fully assembled, high-performance, and when connected to your fan and ducting, reduce your noise output by up to 25dba without reducing airflow. Duct Mufflers are both non-toxic and fire resistant.
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