30"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 21.75"h] 6in diameter + Product Details Size -

+ Product Details Size - 36"w X 18"h X 2"d (for duct opening measurement only)

+ Product Details Size - 26"w X 32"h is the size for the duct opening measurement only

+ Product Details Size – 24" x 26" or 26" x 24" is the size for the duct opening measurement only

vibration-free performance

For 8" duct opening

30"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 21.75"h] 6in diameter + Product Details Size -+ Product Details Size 30"w X 20"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 31. 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