| Duct Muffler that can make indoor gardening fans significantly quieter, and can reduce noise heard from room to room. The Duct Muffler reduces noise by up to 25 dBA; a reduction by 3dBA cuts a listener's perception of sound by half! These Duct Mufflers are easy to install, connect to existing ductwork, don't restrict airflow, and require no maintenance. Support brackets not included. |
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