Electrical Box, Box Type Octagon Ceiling Pan, Number of Gangs 2, Capacity 21.5 cu in, Material Pre-Galvanized Steel, Number of 1/2 In. Back Knockouts 3, Number of 1/2 In. Side Knockouts 4, Rated Fan Rated, Nominal Depth 2 1/8 in, Nominal Length 4 in, Nominal Width 4 in, Color Silver, Standards UL, Package Quantity 2