A large amount of CFM loss can be eliminated by calking and foil taping duct boots around drywall and flooring.  Calking should only be used for penetrations of an 1/4" or less.  Taping looks best if its attached to the sub-floor or trimmed to fit under registers.

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Residential air infiltration and air duct testing

Want to reduce your Duct Leakage numbers?

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