34"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 35.75"w x 27.75"h] Return + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 24"w X 32"h is the size for the duct opening measurement only

+ Product Details Size – 34" x 34" is the size for the duct opening measurement only

+ Product Details Size - 20"w X 22"h is the size for the duct opening measurement only

75"H – fits a 24" X 6" duct opening

actual front end outer dimensions are approximately 27 5/8" width X 26 5/8" height

34"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 35.75"w x 27.75"h] Return + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 24"w X 32"h is the size for the duct opening measurement only + Product Details Size – 34" x 34" is the size for the duct opening measurement only