8"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 37.75"h] 14in diameter accordion dd ul li { 4 X 12 Is CRFG2028 Width_14in

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+ Product Details Size - 26"w X 18"h X 2"d (for duct opening measurement only)

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

+ Product Details Perfect Fit & Easy Sizing - Designed for a 28" x 22" OR 22" x 28" duct opening (measured at the opening)

75"H – fits a 20" X 6" duct opening

8"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 9.75"w x 37.75"h] 14in diameter accordion dd ul li { 4 X 12 Is CRFG2028 Width_14in accordion dd ul li { margin bottom: 6px + Product Details Size 26"w X 18"h X 2"d (for duct opening measurement only)