24"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Black [Outer Dimensions 25.75"w x 37.75"h] 6" Round Duct Pipe + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – 10"w X 14"h is the size for the duct opening measurement only

75"H – fits a 16" X 12" duct opening

Pack of 4 Pieces

+ Product Details Perfect Fit & Easy Sizing - Designed for a 22" x 20" OR 20" x 22" duct opening (measured at the opening)

+ Product Details Size - 24"w X 8"h X 2"d (for duct opening measurement only)

24"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh Black [Outer Dimensions 25.75"w x 37.75"h] 6" Round Duct Pipe + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 10"w X 14"h is the size for the duct opening measurement only 75"H – fits a 16" X 12" duct opening