26"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 21.75"h] Material_Steel + Product Details Size –

+ Product Details Size – 28" x 30 or 30" x 28" is the size for the duct opening measurement only

+ Product Details Size – 26" x 36" or 36" x 26" is the size for the duct opening measurement only

+ Product Details Size - 10"w X 12"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are 19" Width X 11" Height

+ Product Details Size – 6" x 34" or 34" x 6" is the size for the duct opening measurement only

26"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 21.75"h] Material_Steel + Product Details Size –+ Product Details Size 26"w X 20"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 27. 75" Width X 21. 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