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On this episode of The Build Show, Jake Bruton welcomes special guest Randy Williams (aka @NorthernBuiltPro) to demonstrate a fascinating air sealing test. Using the "magic wand" and RetroTech's Solo manometer, they explore air leakage in a home, testing attic and crawlspace air barriers. Watch as Randy teaches Jake a new way to evaluate airtightness and uncover hidden leaks. Don't miss this hands-on building science lesson!