14"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 15.75"w x 31.75"h] w34h34 + Product Details Size -

+ Product Details Size - 20"w X 10"h is the size for the duct opening measurement only

+ Product Details Size - 12"w X 36"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are approximately 16 5/8" width X 36 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 22" x 18" OR 18" x 22" duct opening (measured at the opening)

14"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 15.75"w x 31.75"h] w34h34 + Product Details Size -+ Product Details Size 14"w X 30"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 15. 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