12"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 13.75"w x 35.75"h] 12in diameter + Product Details Size –

+ Product Details Size – 40"w X 10"h is the size for the duct opening measurement only

+ Product Details Size – 12"w X 16"h is the size for the duct opening measurement only

+ Product Description Ventilate your home or commercial space with our Aluminum Outdoor Weatherproof Louvers

+ Product Details Size - 14"w X 18"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 27 5/8" width X 32 5/8" height

12"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 13.75"w x 35.75"h] 12in diameter + Product Details Size –+ Product Details Size 12"w X 34"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 13. 75" Width X 35. 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