16"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Brown [Outer Dimensions 17.75"w x 17.75"h] return grille + Product Details Size -

+ Product Details Size - 18"w X 34"h is the size for the duct opening measurement only

+ Product Details Size - 34"w X 18"h is the size for the duct opening measurement only

Slots Are Angled to Diversify The Airflow In 2 Way Direction - Great for Wall and Floor & ceiling Applications

actual front end outer dimensions are approximately 28 5/8" width X 10 5/8" height

16"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Brown [Outer Dimensions 17.75"w x 17.75"h] return grille + Product Details Size -+ Product Details Size 16"w X 16"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 17. 75" Width X 17. 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