12"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 13.75"w x 11.75"h] 8" Round Duct Pipe + Product Details Size -

+ Product Details Size - 25"w X 12"h is the size for the duct opening measurement only

High Quality – High-quality rust-free

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 30" OR 30" X 14" duct opening (measured at the opening)

+ Product Details Size - 12"w X 6"h is the size for the duct opening measurement only

12"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 13.75"w x 11.75"h] 8" Round Duct Pipe + Product Details Size -+ Product Details Size 12"w X 10"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 13. 75" Width X 11. 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