Air Return Plenum for Dust Collector Closet

[Ole Anderson]

My door to the dust collection closet is a layer of 1/2" drywall sandwiched between two layers of 1/2" OSB. No special seals. Most of the noise is low frequency rumble. Here is an old video I did regarding noise: https://www.youtube.com/watch?v=8X8q...el=aandersonmi

[Wayne Cannon]

You've covered conducted and transmitted noise from the DC here.

Based on sound measurements in electronic instruments, one of the biggest factors we found was air flow through the air intake & exhaust grates in the cabinet. Stamped sheet metal grates created a LOT more air noise than round wire grates.

Since most air registers/grates are stamped sheet metal, another place to reduce noise might be with smooth wire registers/grates.