O-Z/Gedney Explosionproof Junction Box YE-181806A

21-5/8 INCH L X 21-5/8 INCH W X 9-13/16 INCH D OVERALL SIZE 18 INCH L X 18 INCH W X 6 INCH D INNER SIZE 3-1/2 INCH HUB SIZE UL 886, CSA APPROVAL SURFACE MOUNTING CLASS I GROUP D, CLASS II GROUP E F G, CLASS III, NEMA 7/9 ENCLOSURE SCREW ON COVER TYPE CAST ALUMINUM BODY MATERIAL CAST ALUMINUM COVER MATERIAL 7/8 INCH (SIDE), 1 INCH (COVER), 11/16 INCH (BOTTOM) WALL THICKNESS HOT DIP GALVANIZED BODY FINISH HOT DIP GALVANIZED COVER FINISH APPLICABLE STANDARD NEC 500-503 YE-A MODEL