6"w X 32"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 33.75"h] Powder-Coated + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 40"w X 20"h is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 14" X 4" duct openings

+ Product Details Size - 25"w X 6"h is the size for the duct opening measurement only

+ Product Details Size - 14"w X 14"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are approximately 24 5/8" width X 27 5/8" height

6"w X 32"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 7.75"w x 33.75"h] Powder Coated + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 40"w X 20"h is the size for the duct opening measurement only Ideal for Walls & Ceilings: Designed for seamless installation in standard 14" X 4" duct openings