NEMA 3R, 12, 4 | EL Enclosure, 12H x 24W x 8D. Construction. 0.075 In. carbon steel. Seams continuously welded and ground smooth. Flange trough collar around all sides of door opening. Collar studs 3/8-16 provided for mounting optional panels. Concealed hinges. Removable and interchangeable doors. Black quarter turn latches.