22"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 23.75"w x 29.75"h] 18" Diameter + Product Details Size -

+ Product Details Size - 26"w X 14"h is the size for the duct opening measurement only

only measure the "hole" in the wall/duct

actual front end outer dimensions are approximately 14 5/8" width X 18 5/8" height

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+ Product Details Size – 30" x 36" or 36" x 30" is the size for the duct opening measurement only

22"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 23.75"w x 29.75"h] 18" Diameter + Product Details Size -+ Product Details Size 22"w X 28"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 23. 75" Width X 29. 75" Height Weather and Pest Proof These louvers are especially designed to prevent water from entering your home, and with a built in back 1 2" mesh they also protect you from annoying rodents like mice, rats, birds, and squirrels High Quality Aluminum The premium durable aluminum will never rust and it will never