26"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 19.75"h] Material_Anodized Aluminum The total outer size of

The total outer size of this grille is the listed size plus 2 and 5/85"

listed size +1

Solid Base Construction – Features a solid base for stable installation and reliable protection

+ Product Details Size - 18"w X 8"h is the size for the duct opening measurement only

+ Product Details Size - 8"w X 16"h is the size for the duct opening measurement only

26"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 19.75"h] Material_Anodized Aluminum The total outer size of+ Product Details Size 26"w X 18"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 27. 75" Width X 19. 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