20"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 35.75"h] White actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in

actual front end outer dimensions are approximately 28 5/8" width X 36 5/8" height

+ Product Details Size - 20"w X 36"h X 2"d (for duct opening measurement only)

+ Product Details Size – 14" x 18" or 18" x 14" is the size for the duct opening measurement only

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20"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 21.75"w x 35.75"h] White actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in actual front end outer dimensions are approximately 28 5 8" width X 36 5 8" height + Product Details Size 20"w X 36"h X 2"d (for duct opening measurement only)