20"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 29.75"h] 1-Way designed for superior airflow (up

designed for superior airflow (up to 95%) and easy filter access

Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 8" duct openings

+ Product Details Size - The listed 6" diameter refers specifically to the size of the duct opening

32" x 8" Aluminum Spiral Duct Air Vent Grille Cover - Fully Adjustable Double Deflection HVAC Air Supply

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 10" duct openings

20"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 29.75"h] 1-Way designed for superior airflow (up+ Product Details Size 20"w X 28"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 21. 75" Width X 29. 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