14"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 15.75"w x 15.75"h] with filter 875" width X 21

875" width X 21

+ Product Details Size – 18"w X 14"h is the size for the duct opening measurement only

Actual Filter Size – 23 3/4"w x 11 3/4" x 1"

+ Product Details Size - 40"w X 20"h is the size for the duct opening measurement only

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14"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 15.75"w x 15.75"h] with filter 875" width X 21+ Product Details Size 14"w X 14"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 15. 75" Width X 15. 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