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n5hvac-talk.
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First,do not try to fix that what ain't broke.Seal all that needs sealed.Is the insulation in good shape?Do what is needed to get the insulation in good repair.That should clear up moisture issues.I do not think that there is a thing wrong with some flex in a duct system when installed properly.I use a little flex on the end of most all my supply runs and I would still be out there tying in package unit
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