24"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - White [Outer Dimensions 25.75"w x 37.75"h] 18in diameter + Product Details Size –

+ Product Details Size – 10" x 36" or 36" x 10" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 12 5/8" width X 38 5/8" height

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

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 16" OR 16" x 26" duct opening (measured at the opening)

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

24"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - White [Outer Dimensions 25.75"w x 37.75"h] 18in diameter + Product Details Size –+ Product Details Size 24"w X 36"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 25. 75" Width X 37. 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