20"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 19.75"h] w24h24 font-weight: bold

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With precise measurements for seamless integration

+ Product Details Size - 16"w X 36"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are approximately 27 5/8" width X 26 5/8" height

+ Product Details Size - 14"w X 16"h X 2"d (for duct opening measurement only)

20"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 19.75"h] w24h24 font-weight: bold+ Product Details Size 20"w X 18"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 21. 75" Width X 19. 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