30"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 7.75"h] Aluminum Bar + Product Details Size –

+ Product Details Size – 24"w X 26"h is the size for the duct opening measurement only

+ Product Details Size - 30"w X 22"h is the size for the duct opening measurement only

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

+ Product Details Size - 36"w X 12"h X 2"d (for duct opening measurement only)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 8" or 8" x 14" duct opening (measured at the opening)

30"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 7.75"h] Aluminum Bar + Product Details Size –+ Product Details Size 30"w X 6"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 31. 75" Width X 7. 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