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No, I'm talking about bigger, louder, centrifugal types like the vortex, hydrofarm, or large can fan models

hey there. I think you could easily make a cheapo version of the inline duct muffler floating around the internet (http://buymarijuanaseeds.com/community/threads/diy-inline-fan-muffler.138045/) by getting two duct reducers (8" to 6") at home depot, lowe's, etc. and using a piece of...