28"w X 32"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 33.75"h] Material_Aluminum + Product Details Size –

+ Product Details Size – 18"w X 10"h is the size for the duct opening measurement only

But they are also the most visible representation of you air system

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

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

28"w X 32"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 33.75"h] Material_Aluminum + Product Details Size –+ Product Details Size 28"w X 32"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 29. 75" Width X 33. 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