Specially designed, High Performance-Opened Cell Foam construction greatly reduces fan noise.

A Duct Muffler can make your indoor gardening fans significantly quieter, and can reduce noise heard from room to room.The 4" 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 duct work, don't restrict airflow, and require no maintenance. Support brackets not included.

Can reduce noise by up to 25 dBA; a 3dBA reduction cuts a listener's perception of sound by half!

A Duct Muffler can make your indoor gardening fans significantly quieter, and can reduce noise heard from room to room. The 6" 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 duct work, doesn't restrict airflow, and requires no maintenance. Support brackets not included.

Reduce fan noise from room to room with a duct muffler. Make your indoor garden notably quieter!

A Duct Muffler can make your indoor gardening fans significantly quieter, and can reduce noise heard from room to room. The 8" 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 duct work, doesn't restrict airflow, and requires no maintenance.

Can reduce noise by up to 25 dBA; a 3dBA reduction cuts a listener's perception of sound by half!

A Duct Muffler can make your indoor gardening fans significantly quieter, and can reduce noise heard from room to room. The 12" 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 duct work, don't restrict airflow, and require no maintenance.