10"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 31.75"h] 8" Diameter + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 16" or 16" x 12" duct opening (measured at the opening)

Filter Size - 27

+ Product Details Size – 14" x 34" or 34" x 14" is the size for the duct opening measurement only

75" width X 35

+ Product Details Size – 20"w X 22"h is the size for the duct opening measurement only

10"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 31.75"h] 8" Diameter + Product Details Perfect Fit+ Product Details Size 10"w X 30"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 11. 75" Width X 31. 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