8"w X 32"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 33.75"h] 18" Diameter actual front end outer dimensions

actual front end outer dimensions are approximately 28 5/8" width X 24 5/8" height

+ Product Details Size – 28"w X 22"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 34" x 12" Or 12" x 34" duct opening (measured at the opening)

+ Product Details Size - 20"w X 2"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 18 5/8" width X 27 5/8" height

8"w X 32"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 33.75"h] 18" Diameter actual front end outer dimensions+ Product Details Size 8"w X 32"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 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 wear