30"w X 32"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 33.75"h] Color_Aluminum + Product Details Size -

+ Product Details Size - 20"w X 20"h is the size for the duct opening measurement only

+ Product Details Size - The listed 10" diameter refers specifically to the size of the duct opening

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 12" OR 12" x 26" duct opening (measured at the opening)

[Outer Dimensions: 20

30"w X 32"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 33.75"h] Color_Aluminum + Product Details Size -+ Product Details Size 30"w X 32"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 31. 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