Garvin Industries 4-11/16" Junction Boxes come in 1-1/2" , 2-1/8" & 3"  depths and are installed in walls or ceilings for lighting fixtures, switches, receptacles, life safety devices, and security cameras.  They come in a solid drawn steel construction and offer knockout configurations for 1/2", 3/4", 1", 1-1/4", & 1-1/2" conduit.  Chicago Plenum boxes have "air tight" knockouts and are approved for use in Chicago Plenum Air Spaces.