22"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 23.75"w x 25.75"h] Return 10"w X 4"h Is The

10"w X 4"h Is The Size For The Duct Opening Measurement Only

actual front end outer dimensions are approximately 30 5/8" width X 22 5/8" height

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

with an additional 1 7/8" width and 2" height

+ Product Details Size - 30"w X 30"h X 2"d (for duct opening measurement only)

22"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 23.75"w x 25.75"h] Return 10"w X 4"h Is The+ Product Details Size 22"w X 24"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 23. 75" Width X 25. 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