The adjustable ceiling hanger box measures 2.75 x 3.5 x 2.25 and is adjustable from 14 to 24.5 inches in hanging diameter. Designed and listed for use with non-metallic sheathed cable in accordance with Article 314 of the National Electrical Code. Pefect for residential and light commercial applications. This electrical box is manufactured with non-conductive PVC for durability and is fire rated 2 hours and UL Listed to help ensure safety.