| 摘要 |
An electrical box includes a top side wall, a right side wall, a bottom side wall, a left side wall, and a rear side wall. At least one check valve is disposed in an opening through at least one of the top side wall, the right side wall, the bottom side wall, the left side wall, or the rear side wall. The check valve defines a central opening through which insulation may be introduced to fill an air gap at least one of behind or around the electrical box. A method for introducing insulation through the electrical box also is described.
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