22"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 23.75"w x 21.75"h] Supply Grille The design eliminates noise and

The design eliminates noise and prevents louvers from vibrating

+ Product Details Size - 18"w X 20"h is the size for the duct opening measurement only

75"H – fits a 10" X 10" duct opening

+ Product Details Size - 12"w X 18"h X 2"d (for duct opening measurement only)

Actual Filter Size – 29 3/4"w x 9 3/4" x 1"

22"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 23.75"w x 21.75"h] Supply Grille The design eliminates noise and+ Product Details Size 22"w X 20"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 23. 75" Width X 21. 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