05-24-2008, 05:41 AM
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Deity
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Join Date: Jul 2004
Location: Saint Regis Falls, NY, USA.
Posts: 3,841
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normally where you have a rigid duct connected to a (movable) duct you'd normally use a vibration transition fitting which is nothing more than a rubber membrane in the form of a duct (round or rectangular) and this is connected between the two ducts. check to see that it isn't rubbing metal to metal, there should be some space between the two.
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