RV ceiling register round white. The diameter of the insert portion / extension measures about 5 1/8 inches, and the depth of the insert portion measures about 1 1/8 inches. The outside / face of the vent measures about 7 inches in diameter. For class A motorhomes / RVs. Made to fit Newmar part number 90931.
Charcoal filter used with vent: RV Ceiling Register Filter 109179P
