Carlon B620K Ceiling Fan Box, New Work, 4-Inch Diameter by 2-1/4-Inch Depth, Blue Carlon non-metallic boxes feature PVC construction for easier installation Designed and listed for use with non-metallic sheathed cable in accordance with Article 314 of the National Electrical Code All PVC boxes are permissible for use with 90 Degree C connectors Non-metallic Blue