Sealing the core wall penetration hole where the copper refrigerant line set, electrical communication cable, and condensate drain hose pass through your exterior wall is essential to prevent air drafts, moisture infiltration, and pests. First, ensure all lines are properly positioned without kinks. Second, clean dust and debris from around the opening. Third, pack the interior and exterior gaps tightly using high-grade exterior-grade expanding foam sealant or durable gray duct seal putty. Fourth, snap the decorative plastic wall sleeve cover tightly into place over the opening. You can troubleshoot drafts by feeling around the wall cassette. You can verify that your sealing is successful when applying incense smoke or feeling with your hand confirms zero outdoor air drafts enter your home around the penetrations.
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