Electrical Box Box Type Round Ceiling Pan Number of Gangs 2 Bracket Type FA 1/2 in Setback Capacity 21.5 cu in Material Galvanized Zinc Number of 1/2 in Back Knockouts 1 Number of 1/2 in Side Knockouts 4 Clamp Type NM-B Rated Fan Rated Nominal Depth 2 1/8 in Nominal Length 4 1/4 in Nominal Width 4 in Color Silver Standards UL