6"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 11.75"h] 10in diameter actual front end outer dimensions

actual front end outer dimensions are approximately 26 5/8" width X 24 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 25" OR 25" X 14" duct opening (measured at the opening)

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

Actual Filter Size – 25 3/4"w x 11 3/4" x 1"

6"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 11.75"h] 10in diameter actual front end outer dimensions+ Product Details Size 6"w X 10"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 7. 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 wear