26"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 25.75"h] 12in diameter + Product Details Size -

+ Product Details Size - 4"w X 34"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 32" x 16" OR 16" x 32" duct opening (measured at the opening)

Its professional design and solid construction make it the perfect solution for safeguarding your thermostat against unwanted access

actual front end outer dimensions are approximately 26 5/8" width X 8 5/8" height

26"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 25.75"h] 12in diameter + Product Details Size -+ Product Details Size 26"w X 24"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 27. 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