26"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 27.75"h] 8" Diameter 75"H – fits a 18"

75"H – fits a 18" X 18" duct opening

+ Product Details Size - 12"w X 4"h is the size for the duct opening measurement only

+ Product Details Size – 29"w X 22"h is the size for the duct opening measurement only

Airflow Control – Adjustable airflow lever allows precise control over the direction and volume of air

unrestricted airflow with a precise 50° angled design

26"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 27.75"h] 8" Diameter 75"H – fits a 18"+ Product Details Size 26"w X 26"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 27. 75" Width X 27. 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