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

+ Product Details Perfect Fit & Easy Sizing - Designed for a 28" x 8" OR 8" x 28" duct opening (measured at the opening)

+ Product Details Size – 8" x 34" or 34" x 8" is the size for the duct opening measurement only

Actual Filter Size – 7 3/4"w x 23 3/4" x 1"

+ Product Details Size - 20"w X 10"h X 2"d (for duct opening measurement only)

+ Product Details Size - 18"w X 34"h X 2"d (for duct opening measurement only)

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