14"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 15.75"w x 21.75"h] 12in diameter + Product Details Size -

+ Product Details Size - 18"w X 32"h X 2"d (for duct opening measurement only)

+ Product Details Size - 26"w X 16"h is the size for the duct opening measurement only

Actual Filter Size – 24 3/4"w x 27 3/4" x 1"

Actual Filter Size – 29 3/4"w x 29 3/4" x 1"

14"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 15.75"w x 21.75"h] 12in diameter + Product Details Size -+ Product Details Size 14"w X 20"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 15. 75" Width X 21. 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