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NEMA Standard Targets Electrical Boxes
The National Electrical Manufacturers Association (NEMA) has published a new standard, NEMA OS 4-2016 Requirements for Air-Sealed Boxes for Electrical and Communication Applications. This standard establishes a performance test and classification scheme for electrical outlet boxes, wall boxes, ceiling boxes, and floor boxes designed to reduce air leaks through them and their installed interface with the building structure. Click here for more information.