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Similar to Mazura's second answer, the Ductwork from the from the return can and should be really long. If you have the room where the ductwork for the return is, make it really long and zigzag it. Mine could be a Direct shot of 10', though I think they installed over 30' of ductwork and it curves all around the place. You can detach it from either end, ...


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Fiberglass Duct Liner: (industrialinsulation.com) Fiberglass duct liner is designed to be installed inside sheet metal ductwork and plenums. Fiberglass duct liner absorbs noise and contributes to indoor comfort by lowering heat loss or gain through duct walls. Or if you have the space for it, build some baffles out of 2x4' acoustic ceiling tiles ...



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