JR Products Ceiling Vent. Replaces air ventilation registers. Requires a 5-1/4in opening and 4 mounting screws. Direct OEM replacement. Won't fade, discolor, rust, or peel. UL 94 C-O and approved for use with Dometic air conditioners. Dimensions: Cut Out Dim. 5in and Outside Dim. 6-1/2in. Polar White, undampered, packaged.