28"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 25.75"h] Compatible With Duct 6in Cubic core eggcrate design has

Cubic core eggcrate design has the highest rate of airflow efficiency

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+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 24" OR 24" x 20" duct opening (measured at the opening)

+ Product Details Size – 4"w X 10"h is the size for the duct opening measurement only

12"w X 6"h Is The Size For The Duct Opening Measurement Only

28"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 25.75"h] Compatible With Duct 6in Cubic core eggcrate design has+ Product Details Size 28"w X 24"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 29. 75" Width X 25. 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