8"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 31.75"h] with filter actual front end outer dimensions

actual front end outer dimensions are approximately 22 5/8" width X 28 5/8" height

actual front end outer dimensions are approximately 34 5/8" width X 20 5/8" height

+ Product Details Size - 30"w X 18"h X 2"d (for duct opening measurement only)

+ Product Details Size - 20"w X 10"h is the size for the duct opening measurement only

Horizontal blades in the front

8"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 31.75"h] with filter actual front end outer dimensions+ Product Details Size 8"w X 30"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 75" Width X 31. 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