The Dometic RV Refrigerator Vent Cover with Base mounts on the roof of your RV, above the refrigerator. This allows circulation and the heat created by the refrigerator to be released.• Durable plastic construction• Cap Dimensions: 26-1/8"L x 12-1/4"W• Cap Mounting Holes Spaced: 21-7/8"L x 5-3/8"W• Base Flange Dimensions: 26"L x 8-3/8"W• Base Body Dimensions: 23-3/8"L x 6-1/2"W• Fits Cut-Out: 23-3/8"L x 6-1/2"W• Replaces Dometic part numbers DC3103633024, DC3103634121, DC3103634022, and DC3103634105 Durable plastic construction Cap measures 26-1/8"L x 12-1/4"W Base Body measures 23-3/8"L x 6-1/2"W | RV Refrigerator Vent Cover, Base and Cap, Polar White