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Offers gardeners a Duct Muffler that can make their indoor gardening fans significantly quieter, and can reduce noise heard from room to room.The Duct Muffler, available in 6",8",10", and 12" sizes (for use with same-size ductwork) 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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