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Best Practices
Airtight Electrical Boxes

Methods for installing electrical boxes that limit air movement and thermal bridging
Green Building News
An Easy Way to Seal Electrical Boxes

This cardboard shell wraps around the box and serves as a form for expanding foam
Building Science
Air Leakage at Electrical Switches and Outlets

How I blew a gasket and exposed the hole in one air-sealing method

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Airtight Electrical Boxes