8"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 17.75"h] Compatible with Duct 8" + Product Details Size –

+ Product Details Size – 22"w X 25"h is the size for the duct opening measurement only

+ Product Details Size – 8" x 30" or 30" x 8" is the size for the duct opening measurement only

Actual Filter Size – 24 3/4"w x 33 3/4" x 1"

designed to optimize your air distribution

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 30" or 30" x 6" duct opening (measured at the opening)

8"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 17.75"h] Compatible with Duct 8" + Product Details Size –+ Product Details Size 8"w X 16"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 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 wear