6"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 19.75"h] Floor Grille + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – 6" x 12" or 12" x 6" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 27 5/8" width X 12 5/8" height

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+ Product Details Size - 22"w X 14"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are approximately 22 5/8" width X 52 5/8" height

6"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 7.75"w x 19.75"h] Floor Grille + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 6" x 12" or 12" x 6" is the size for the duct opening measurement only actual front end outer dimensions are approximately 27 5 8" width X 12 5 8" height