6"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 25.75"h] w30h30 Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 6" duct openings

actual front end outer dimensions are approximately 27 5/8" width X 24 5/8" height

+ Product Details Size – 26" x 34" or 34" x 26" is the size for the duct opening measurement only

+ Product Details Size - 22"w X 10"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 22 5/8" width X 16 5/8" height

6"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 25.75"h] w30h30 Ideal for Walls & Ceilings:+ Product Details Size 6"w X 24"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 7. 75" Width X 25. 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