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] w10h10 + Product Details Size –

+ Product Details Size – 10" x 26" or 26" x 10" is the size for the duct opening measurement only

the actual front end outer dimensions are 8" in diameter

Actual Filter Size – 29 3/4"w x 9 3/4" x 1"

R Value Rating of Insulation - R3

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] w10h10 + Product Details Size –+ 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