28"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 17.75"h] 8" Diameter + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 14"w X 22"h is the size for the duct opening measurement only

85" width X 5

75"H – fits a 12" X 8" duct opening

+ Product Details Size - 10"w X 22"h is the size for the duct opening measurement only

+ Product Details Size – 10" x 26" or 26" x 10" is the size for the duct opening measurement only

28"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 29.75"w x 17.75"h] 8" Diameter + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 14"w X 22"h is the size for the duct opening measurement only 85" width X 5