Garvin 52171-3/4-VT 4" Square Chicago Plenum Air Tight Junction Box, Drawn, 2-1/8" Deep, (8) 3/4" Knockouts

Chicago plenum 2-1/8 in deep 4 in square drawn boxes with air tight (8) 3/4 in side knockouts and (3) 1/2 in & (2) 3/4 in bottom knockouts are installed in air plenum walls or ceilings spaces for lighting fixtures switches receptacles or other outlet devices. Square boxes are used to bring power to a number of electrical devices where multiple conductor runs are split in two or more directions.