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It's just a wild assed idea, but what about insulating the ducts? A roll of that fiberglass and foil duct insulation might dampen the noise. Also, try isolating the source of the noise. I'm thinking that the point where the fan meets the duct would be a big noise maker, transferring vibrations and such to the duct where it kind of amplifies. I don't know how big of a duct you're using, but can you rig some sort of coupling between the fan and duct that wouldn't transfer sound?
where is this venting?
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