Best Answer Anonymiss , 25 May 2017 - 06:19 PM
What's making the noise, the fan or the air emerging from the outlet?
The latter can be reduced by putting the carbon filter on the outlet rather than the inlet, although this will increase the inlet noise.
Perhaps use two?
egg trays
These might be useful for quitening reflected sound, but they don't have much mass so they might not be much use for blocking transmiited noise/vibrations (mass and isolation are the key words here).
As a substitute, look around for some acoustic damping material - Not the stuff that goes in corners to reduce bass or on walls to reduce reflections, though, but the (sorbothane?) mats used to line speakers or as isolation pads. Go to the full post
