34"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 35.75"w x 9.75"h] Aluminum Bar + Product Details Size –

+ Product Details Size – 18" x 24" or 24" x 18" is the size for the duct opening measurement only

+ Product Details Size – 25"w X 36"h is the size for the duct opening measurement only

+ Product Details Size - 36"w X 34"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are approximately 22 5/8" width X 34 5/8" height -

actual front end outer dimensions are 19" Width X 13" Height

34"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 35.75"w x 9.75"h] Aluminum Bar + Product Details Size –+ Product Details Size 34"w X 8"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 35. 75" Width X 9. 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