8"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 21.75"h] sidewall + Product Details Size –

+ Product Details Size – 25"w X 20"h is the size for the duct opening measurement only

+ Product Details Size – 8" x 16" or 16" x 8" is the size for the duct opening measurement only

Filter Size - 9

making it a versatile choice for both residential and commercial settings

8"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 21.75"h] sidewall + Product Details Size –+ Product Details Size 8"w X 20"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 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 wear