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You are probably getting a little of both kinds of noise.


To kill the vibration noise, try replacing part of the duct run with insulated flexi-duct and make sure there are a couple of sweeping 90 degree bends on the way.


As for the air flow noise, use a bigger diffusor and try running the air into the side of the box behind the diffusor instead of straight out into the room. You can also line the box with some limp-damp material like you were talking about.


Good luck.
 
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