8"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 21.75"h] Compatible with Duct 6" + Product Details Size -

+ Product Details Size - 6"w X 30"h is the size for the duct opening measurement only

[Outer Dimensions: 12

this guard ensures long-lasting protection while offering a sleek

with no sharp edges

+ Product Details Size - 25"w X 20"h is the size for the duct opening measurement only

8"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 21.75"h] Compatible with Duct 6" + Product Details Size -+ Product Details Size 8"w X 20"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 75" Width X 21. 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